HUGS 2024

May 28, 2024, 12:00 AM → Jun 14, 2024, 6:00 PM US/Eastern

F113 - CEBAF Center (Jefferson Lab)

Alberto Accardi (Hampton U. and Jefferson Lab), Adam Freese (Jefferson Lab), Gloria Montana (Jefferson Lab), Pierre Chatagnon (Jefferson Lab), Caroline Silva Rocha Costa (Jefferson Lab)

The HUGS Program at Jefferson Lab is a summer school designed for experimental and theoretical nuclear and particle physics graduate students who have finished their coursework and have at least one year of research experience in these fields. The program is simultaneously intensive, friendly, and casual. All lecturers are internationally renowned and leaders in their fields.

Tue, May 28

1 Breakfast

2 HUGS welcome

Speaker: Alberto Accardi (Hampton U. and Jefferson Lab)

Meet 'n' Greet 2024.pdf

3 Greetings from the director

Speaker: Stuart Henderson (Jefferson Lab)

4 Residence Facility Orientation

5 Fostering a Positive and Respectful Workplace

Speaker: Lisa Surles-Law

10:15 AM Break

6 Check-In and badging

11:30 AM Lunch

7 Safety at JLab

HUGS Safety Briefing.pdf

8 Group picture and Break

JLab now and in the future: Lecture 1

9 The CEBAF accelerator

Speaker: yves roblin (jefferson lab)

hugs2024-part1.pptx

3:30 PM Break

10 A positron beam at JLab

Speaker: yves roblin (jefferson lab)

hugs2024-part2.pptx

Discussion

Wed, May 29

Lattice QCD for the Hadronic and Nuclear Physics: Lecture 1

11 Lattice QCD for the Hadronic and Nuclear Physics: Lecture 1

Speaker: Huey-Wen Lin (Michigan State University)

hwlin-HUGS-School-Lec1-1.pdf

9:45 AM Break

Lattice QCD for the Hadronic and Nuclear Physics: Lecture 2

12 Lattice QCD for the Hadronic and Nuclear Physics: Lecture 2

Speaker: Huey-Wen Lin (Michigan State University)

10:40 AM Break

Lattice QCD for the Hadronic and Nuclear Physics: Lecture 2b

13 Lattice QCD for the Hadronic and Nuclear Physics: Lecture 2b

Speaker: Huey-Wen Lin (Michigan State University)

Discussion

12:00 PM Lunch

JLab now and in the future: Lecture 2

14 JLab now and in the future: Lecture 2

Speaker: Patrizia ROSSI (JEFFERSON LAB)

Rossi_HIGS 2024.pdf

2:30 PM Break

JLab now and in the future: Lecture 3

15 JLab now and in the future: Lecture 3

Speaker: Patrizia ROSSI (JEFFERSON LAB)

Rossi_HIGS 2024.pdf

Discussion

HUGS social

Thu, May 30

Exploring QCD at the EIC: Lecture 1

16 Exploring QCD at the EIC: Lecture 1

Speaker: Christian Weiss (Jefferson Lab)

weiss24_hugs24.pdf

10:00 AM Break

Exploring QCD at the EIC: Lecture 2

17 Exploring QCD at the EIC: Lecture 2

Speaker: Christian Weiss (Jefferson Lab)

Discussion

11:30 AM Lunch

Lattice QCD for the Hadronic and Nuclear Physics: Lecture 3

18 Lattice QCD for the Hadronic and Nuclear Physics: Lecture 3

Speaker: Huey-Wen Lin (Michigan State University)

1:45 PM Break

Lattice QCD for the Hadronic and Nuclear Physics: Lecture 4

19 Lattice QCD for the Hadronic and Nuclear Physics: Lecture 4

Speaker: Huey-Wen Lin (Michigan State University)

HUGS social: JLab Run-a-round

Fri, May 31

JLab tour

20 JLab Tour

21 Accelerator Tunnel

22 Machine Control Center (MCC)

23 Hall B

24 Hall C

25 Superconducting Radio-Frequency Institute

26 Test Lab

12:00 PM Lunch

Lattice QCD for the Hadronic and Nuclear Physics: Lecture 5

27 Lattice QCD for the Hadronic and Nuclear Physics: Lecture 5

Speaker: Huey-Wen Lin (Michigan State University)

hwlin-HUGS-School-Lec3.pdf

2:45 PM Break

Exploring QCD at the EIC: Lecture 3

28 Exploring QCD at the EIC: Lecture 3

Speaker: Christian Weiss (Jefferson Lab)

weiss24_hugs24.pdf

Discussion

Sun, June 2

Excursion

Mon, June 3

Neutrino interactions for hadronic physics: Lecture 1

29 Neutrino interactions for hadronic physics: Lecture 1

Speaker: Bryan Ramson (FNAL)

Lecture1.pdf

10:00 AM Break

Neutrino interactions for hadronic physics: Lecture 2

30 Neutrino interactions for hadronic physics: Lecture 2

Speaker: Bryan Ramson (FNAL)

Discussion

11:30 AM Lunch

Perturbative QCD and Global QCD analysis: Lecture 1

31 Perturbative QCD and Global QCD analysis: Lecture 1

Speaker: Christopher Cocuzza (Temple University)

Perturbative QCD and Global QCD Analysis

2:30 PM Break

Perturbative QCD and Global QCD analysis: Lecture 2

32 Perturbative QCD and Global QCD analysis: Lecture 2

Speaker: Christopher Cocuzza (Temple University)

Discussion

Recitations

33 Recitation 2

Tue, June 4

Machine Learning for Nuclear Physics: Lecture 1

34 Machine Learning for Nuclear Physics: Lecture 1

Speaker: Daniel Lersch (Jefferson Lab)

HUGS_2024_AIML_intro_part1.pdf

10:00 AM Break

Machine Learning for Nuclear Physics: Lecture 2

35 Machine Learning for Nuclear Physics: Lecture 2

Speaker: Daniel Lersch (Jefferson Lab)

HUGS_2024_AIML_intro_part2.pdf

Discussion

11:30 AM Lunch

Perturbative QCD and Global QCD analysis: Lecture 3

36 Perturbative QCD and Global QCD analysis: Lecture 3

Speaker: Christopher Cocuzza (Temple University)

2:30 PM Break

Perturbative QCD and Global QCD analysis: Lecture 4

37 Perturbative QCD and Global QCD analysis: Lecture 4

Speaker: Christopher Cocuzza (Temple University)

Discussion

Recitations

38 Recitation 3

Wed, June 5

Perturbative QCD and Global QCD analysis: Lecture 5

39 Perturbative QCD and Global QCD analysis: Lecture 5

Speaker: Christopher Cocuzza (Temple University)

10:00 AM Break

Parity violation experiments at Jlab: Lecture 1

40 Parity violation experiments at Jlab: Lecture 1

Speaker: Ciprian Gal (Jefferson Lab)

Discussion

11:30 AM Break

41 Lunch seminar (Pizza provided !): Science communication

Lunch will be provided

Speaker: Raul Briceno (Jefferson Lab)

1:00 PM Break

Machine Learning for Nuclear Physics: Hands-On 1

42 Machine Learning for Nuclear Physics: Hands-On 1

Speaker: Thomas Britton (JLab)

handson slides

2:30 PM Break

Machine Learning for Nuclear Physics: Hands-On 2

43 Machine Learning for Nuclear Physics: Hands-On 2

Speaker: Thomas Britton (JLab)

Discussion

HUGS social

Thu, June 6

Parity violation experiments at Jlab: Lecture 2

44 Parity violation experiments at Jlab: Lecture 2

Speaker: Ciprian Gal (Jefferson Lab)

10:00 AM Break

Parity violation experiments at Jlab: Lecture 3

45 Parity violation experiments at Jlab: Lecture 3

Speaker: Ciprian Gal (Jefferson Lab)

Discussion

11:30 AM Lunch

Neutrino interactions for hadronic physics: Lecture 3

46 Neutrino interactions for hadronic physics: Lecture 3

Speaker: Bryan Ramson (FNAL)

Lecture2.pdf

2:30 PM Break

Machine Learning for Nuclear Physics: Lecture 3

47 Machine Learning for Nuclear Physics: Lecture 3

Speakers: Gagik Gavalian (Jefferson Lab), Torri Jeske (JLAB)

HUGS-2024.pdf

HUGS_LECTURES_Jeske.pdf

Discussion

Recitations

48 Recitation 4

Fri, June 7

Parity violation experiments at Jlab: Lecture 4

49 Parity violation experiments at Jlab: Lecture 4

Speaker: Ciprian Gal (Jefferson Lab)

10:00 AM Break

Parity violation experiments at Jlab: Lecture 5

50 Parity violation experiments at Jlab: Lecture 5

Speaker: Ciprian Gal (Jefferson Lab)

Discussion

11:30 AM Lunch

Neutrino interactions for hadronic physics: Lecture 4

51 Neutrino interactions for hadronic physics: Lecture 4

Speaker: Bryan Ramson (FNAL)

2:30 PM Break

Neutrino interactions for hadronic physics: Lecture 5

52 Neutrino interactions for hadronic physics: Lecture 5

Speaker: Bryan Ramson (FNAL)

Discussion

Sat, June 8

JLab tour: JLab Open House

Sun, June 9

Excursion

Mon, June 10

Scattering Theory & QCD Spectroscopy: Lecture 1

53 Scattering Theory & QCD Spectroscopy: Lecture 1

Speaker: Andrew Jackura (William & Mary)

Jackura_2024_hugs_intro.pdf

10:00 AM Break

Scattering Theory & QCD Spectroscopy: Lecture 2

54 Scattering Theory & QCD Spectroscopy: Lecture 2

Speaker: Andrew Jackura (William & Mary)

Jackura_2024_hugs_lecture_1_and_2.pdf

Discussion

11:30 AM Lunch

Hadron spectroscopy: From JLab to the EIC: Lecture 1

55 Hadron spectroscopy: From JLab to the EIC:Lecture 1

Speaker: Volker Crede (Florida State University)

Lecture 1.pdf

2:30 PM Break

Hadron spectroscopy: From JLab to the EIC: Lecture 2

56 Hadron spectroscopy: From JLab to the EIC: Lecture 2

Speaker: Volker Crede (Florida State University)

Lecture 2 (1).pdf

Discussion

Recitations

57 Recitation 5

Tue, June 11

Scattering Theory & QCD Spectroscopy: Lecture 3

58 Scattering Theory & QCD Spectroscopy: Lecture 3

Speaker: Andrew Jackura (William & Mary)

Jackura_2024_hugs_lecture_3_and_4.pdf

10:00 AM Break

Scattering Theory & QCD Spectroscopy: Lecture 4

59 Scattering Theory & QCD Spectroscopy: Lecture 4

Speaker: Andrew Jackura (William & Mary)

Discussion

11:30 AM Lunch

Hadron spectroscopy: From JLab to the EIC: Lecture 3

60 Hadron spectroscopy: From JLab to the EIC: Lecture 3

Speaker: Volker Crede (Florida State University)

Lecture 3.pdf

2:30 PM Break

Hadron spectroscopy: From JLab to the EIC: Lecture 4

61 Hadron spectroscopy: From JLab to the EIC: Lecture 4

Speaker: Volker Crede (Florida State University)

Lecture 4.pdf

Discussion

Recitations

62 Recitation 6

Wed, June 12

Student seminars

63 Hypercentral quark model for mass spectra, semileptonic decays and Regge trajectories of doubly heavy $\Xi$ baryons

In this work, we discuss the mass spectra and decays of doubly heavy $\Xi$ baryons in the framework of a non-relativistic quark model. We consider a baryon with two heavy quarks including $\Xi_{ccd}$, $\Xi_{ccu}$, $\Xi_{bbd}$, $\Xi_{bbu}$, $\Xi_{bcd}$ and $\Xi_{bcu}$. We find the wave functions, eigenenergies and mass spectra of the system under investigation by solving the hyperradial Schr\"odinger equation for three particles interacting with the hypercentral quark potential. The numerical results of our study are presented for the ground state masses, radial and orbital excited states masses of the doubly heavy $\Xi$ baryons. Due to the lack of experimental data, the numerical results provided by our calculations are compared with other relevant theoretical works. The magnetic moments of these baryons are also calculated. The calculation of the transition magnetic moments is then used to obtain the radiative decay widths for these baryons. Using a particular form of the universal Isgur-Wise function, the semileptonic decay widths and branching ratio of the doubly heavy $\Xi$ baryons are calculated and compared with other theoretical investigations. The Regge trajectories of the systems under investigation are plotted in both $(n_r, M^2)$ and $(J, M^2)$ planes.

Speaker: André Aimé Atangana Likene (U. of Yaounde I)

JLab_Conf_Andre.pdf

64 Extraction of the transversity PDF

The talk is about my PhD project which is about the extraction of the transversity function through di-hadrons observables. I will explain why I am interested in this project and what are the main features and difficulties.

Speaker: Luca Polano (U. of Pavia)

HUGSfinal_LPolano.key

HUGSFINAL_LPolano.zip

65 Deeply Virtual Compton Scattering Using a Neutral Particle Spectrometer

Deeply Virtual Compton Scattering (DVCS) is the simplest probe of Generalized Parton Distributions, which offer information on the spatial and longitudinal momentum distributions of particles within the nucleon. The use of a PbWO4 electromagnetic calorimeter to perform neutral particle spectrometry allows for high precision measurements of the DVCS cross section, providing deeper insight to the internal structure of the proton and neutron.

Speaker: Mark Mathison (Ohio U.)

Deeply Virtual Compton Scattering Using a Neutral Particle.pdf

66 Nuclear Fragmentation Functions in Nuclear Media

We perform a detailed phenomenological analysis of how well hadronization in nuclear environments can be described in terms of effective fragmentation functions. The medium modified fragmentation functions are assumed to factorize from the partonic scattering cross sections and evolve in the hard scale in the same way as the standard or vacuum fragmentation functions. Based on precise data on semi-inclusive deep-inelastic scattering off nuclei and hadron production in deuteron-gold collisions, we extract sets of effective fragmentation functions for pions NLO accuracy.

Speaker: Ramiro Martinez (U. Buenos Aires)

nFFs_RAMIRO_MARTINEZ.pdf

10:00 AM Break

Student seminars

67 Reconstructing PDFs from LQCD data(GP and INN)

The purpose of this work is to obtain Parton distribution function(PDF) from Lattice QCD observables. This can be achieved with the help of the Ioffe-time pseudo- distributions formalism, where this task reduces to solve an inverse problem. I introduce Invertible Neural Networks (INN) and Gaussian Process(GP) techniques that have been implemented and developed in the recent years to infer PDF parametrization from data by mapping probability distributions in the case of INN and minimizing the Negative Log Marginal Likelihood to obtain hyper-parameters for GP.

Speaker: Yamil Cahuana (William & Mary)

hugs_yamilfinal.pdf

hugs_yamil.key

68 Charged Pion Polarizability in Hall D

The mission of the Charged Pion Polarizability (CPP) experiment at Jefferson Lab is probing the $\gamma \gamma \to \pi \pi$ channel to extract the value of the pion polarizability from the Primakoff cross section. CPP was performed in experimental Hall D starting in the spring of 2022 and finishing in late summer, totaling 129,152,986,149 production events recorded. Hall D is home to the GlueX target and detector array, which was retrofitted with a $^{208}$Pb target and new muon detector for the CPP run. The additional detector's main role is identifying muon tracks which is crucial for removing background to isolate the Primakoff channel. Post experiment efforts have been focused on calibration, constructing a pure muon sample from the data, constructing a pure pion sample from the data, and preparing a neural net to separate muon background from pion signal.

Speaker: Albert Fabrizi

hugs_pres_albert_fabrizi_pdf.pdf

69 Feasibility for x-dependence of GPDs in GlueX and Bayesian Statistics in J/Psi photoproduction

The JPAC frequentist approach to the reaction $\gamma p \rightarrow J/\psi p$ has led to an interesting discussion of possible interesting phenomena occurring in 2C and non-resonant 3C channels seen in cusps in the cross section versus energy diagrams. However, the frequentist approach involves complications during the uncertainty discussion, so we endeavor to apply Bayesian statistic approaches to this problem to expand upon the conclusions of Winney et al.

I endeavor to undertake a feasibility analysis on a rare process which could shed light into the structure of the proton by connecting observables to the dependent components of the generalized parton distributions (GPDs). Many experiments have undertaken the same goals, including CLAS and other experiments run in Halls A and C at JLab, but GlueX has not delved deeply into this particular problem due to the presence of a photon beam at GlueX. Looking into these rare processes requires very high momentum transfer to probe the structure of the proton, and in Halls A and C that momentum transfer has come from the electron beam and proton target interaction. To investigate the GPDs x-dependence, we must use single diffractive hard exclusive process (SDHEP), which gives more constraints on the x-dependence than other approaches."

Speaker: Shelby Arrigo (William & Mary)

HUGS24.pdf

70 Generative modelling for CLAS analysis

Artificial Intelligence (AI) generative models have been successfully used in several field. In this contribution I will present results of the A(I)DAPT (AI for Data Analysis and Data PreservaTion) working group. Our objective is to develop AI-based tools to address the main challenges in Nuclear Physics and High Energy Physics measurements: unfold detector effects and preserve multi-dimensional correlations when working on large datasets.
In this contribution I will present a first closure test performed on pseudo-data matched on CLAS g11 experiment kinematics, where generative models were able to unfold detector effects on data and reproduce multi-differential contribution in data. I will also show the current progress in expanding this study towards more complex processes and detector layout, such as CLAS12 two pion electroproduction.

Speaker: Marco Spreafico (INFN GE)

poster_HUGS2024_Marco_Spreafico.pdf

Sprefico_HUGS.pdf

Sprefico_HUGS.pptx

11:30 AM Lunch

Scattering Theory & QCD Spectroscopy: Lecture 5

71 Scattering Theory & QCD Spectroscopy: Lecture 5

Speaker: Andrew Jackura (William & Mary)

Jackura_2024_hugs_lecture_5.pdf

2:30 PM Break

Hadron spectroscopy: From JLab to the EIC: Lecture 5

72 Hadron spectroscopy: From JLab to the EIC: Lecture 5

Speaker: Volker Crede (Florida State University)

Discussion

Recitations

73 Recitation 7

Thu, June 13

Student seminars

74 \rho and \phi vector meson production using light front holographic QCD

In this seminar, I will present our recent work on ρ and 𝜙 vector meson production using light-front holographic QCD. The total cross section is convoluted with the light-front wave functions (LFWFs) of both the produced vector mesons from holographic QCD and the photon LFWFs, which are calculable in perturbative QCD, as well as the dipole scattering amplitude. Furthermore, we have also computed the static properties such as the electromagnetic form factors of the vector mesons, along with the decay constants and distribution amplitudes.

Speaker: Bheemsehan Gurjar (Indian Institute of Technology Kanpur)

Bheemsehan_HUGS_2024.pdf

75 Probing Hadron Structure with Meson Electroproduction

In this presentation, I will present an overview of Generalized Parton Distributions (GPDs), crucial tools in understanding the intricate structure of hadrons, and experimental efforts at Jefferson Lab to probe them. We begin by introducing light cone coordinates, which provide a natural framework for describing the internal dynamics of hadrons in high-energy processes. Motivating the need for GPDs, we will outline their foundational principles and highlight their role in bridging the gap between the spatial and momentum distributions of partons.

We will then explore the challenges faced in extracting GPDs from experimental data, addressing both theoretical and practical obstacles. To ground our discussion in experimental reality, we will examine exclusive meson production, illustrating how these processes serve as vital probes for GPD studies. I will focus on the recently completed experiments with neutral final states using the Neutral Particle Spectrometer (NPS) in Hall C and their role in advancing our understanding of GPDs. An overview of the Run Group 1 experiments will be presented."

Speaker: Avnish Singh (Catholic U. of America)

HUGS_Presentation.pdf

76 Towards gamma* gamma* -> pi pi on the Lattice

In 2210.08051, Briceño, Jackura, Rodas and Guerrero developed formalism allowing us to explore the process gamma gamma -> pi pi through lattice results. Such a process is of importance to, for example, our understanding of glueballs and muon g-2. It is also a stepping stone towards beyond standard model physics, such as double beta decay. We will explain ongoing work towards testing this formalism in a 1+1D calculation of the analogous reaction in the O(3) nonlinear sigma model. In particular, we will present preliminary results of the determination of the low-lying spectrum of the theory and the spatial one particle form factors.

Speaker: Ivan Mauricio Burbano Aldana (U. of California, Berkeley)

presentation_powerpoint.pptx

77 Low-mass dark sector searches with deuteron photodisintegration

Recent years have seen much activity in searches for dark-sector messenger particles in the 10–100 MeV mass range, especially in view of a potential new light boson conjectured by the ATOMKI Collaboration, X17. Under the assumption that the messenger particle has definite parity and either zero or unit spin, quite stringent bounds already exist on its coupling to electrons and protons. Equally stringent bounds on the neutron coupling do not exist yet, but are nonetheless desirable. We explore how measurements of deuteron photodisintegration with a quasifree neutron can yield bounds on the neutron coupling, and compute projections for a potential measurement at the low-energy high-intensity electron scattering experiment MAGIX@MESA. The projected bounds are found to be competitive for an axial-vector or pseudoscalar scenario, but not for a vector or scalar scenario.

Speaker: Cornelis Mommers (Johannes Gutenberg U. of Mainz)

HUGS2024_talk_CJGMommers.pdf

10:00 AM Break

Student seminars

78 Study of Photonuclear reaction in Jefferson Lab Hall D

Photonuclear reactions using real photons provide a unique probe for fundamental aspects of QCD in the nuclear medium. The experiment E12-19-003 was conducted at Jefferson lab in the fall of 2021 using a real photon beam from a 10.9 GeV electron beam on liquid helium, deuterium, and carbon targets using standard GlueX detector configuration. In this experiment, we use photonuclear reactions such as the photoproduction of the rho meson to study the structure of photons, looking for signatures of the transition from hadronic to partonic degrees of freedom. We also search for the signature of a phenomenon predicted by QCD called color transparency. This presentation will provide an overview of the analysis and preliminary results.

Speaker: Bhesha Devkota (Mississippi State Uiversity)

Hugs_2024_bhesha.pptx

79 Thermodynamics of finite volume quark matter in anisotropic momentum distribution

The influence of anisotropic momentum distribution and strangeness chemical potential on finite volume isospin asymmetric quark matter is investigated by using a three-flavored Polyakov quark meson model. The model incorporates quark condensates and vector fields to study the QCD phase transitions and susceptibilities of conserved charges in both anisotropic and isotropic quark mediums. A shift in the chiral critical endpoint (CEP) to lower values of quark chemical potential and higher temperatures is observed for increasing system size. Decreasing the strangeness chemical potential results in a shift of CEP to lower quark chemical potential and higher temperatures. The impact of anisotropic momentum distribution is examined through the anisotropy parameter, $\xi$. Additionally, including the Polyakov loop potential elucidates changes in the deconfinement transition line. This investigation provides insights into the intricate dynamics governing finite-size isospin asymmetric quark matter.

Speaker: NISHA CHAHAL (NIT JALANDHAR)

HUGS_ppt.pdf

80 Finite-Volume Electroweak Two Nucleon Matrix Elements

The two-nucleon system is ubiquitous in nuclear physics and has long served as a test bed for nuclear models and calculations. Recent advances in lattice QCD have allowed the first investigations of the two nucleon system, along with the formalism necessary to calculate matrix elements and connect them to physical observables. In this talk, we will address the need for electroweak matrix elements of the two nucleon system and the current work being done to extract new physics from lattice calculations.

Speaker: Joseph Moscoso (University of North Carolina at Chapel Hill)

NNME_PEFT.pdf

81 Disconnected 3-Point Functions Using Wilson Loops on the Lattice

Evaluating disconnected 3-point functions which utilize standard 2-point functions of pions, protons, and anti-protons at non-zero momentum and wilson loops of a large range of sizes produce a correlation that is significantly higher than one.

Speaker: Jacob Peyton (New Mexico State U.)

Jacob Peyton HUGS 2024 Google Slides Presentation

Jacob Peyton HUGS 2024 Presentation.pdf

11:30 AM Lunch

Poster session

82 Elucidating Strangeness with Electromagnetic Probes

Theory models predict a total of 44 cascade states below 2.5 GeV. Currently, there are only six Ξ states that have at least a three-star rating in the PDG, with the production mechanism of these states still remaining mostly elusive. The goal of the “Very Strange” project is to study the quasi-real photoproduction of cascades to search for missing and new states. The new data from Jefferson Lab would make it possible to measure for the first time the beam polarisation transfer and induced polarisation of the Ξ- baryon as a kinematical variable function. Additionally, cascade studies look promising as a tool to differentiate genuine quark states from hadronic molecules, for which the Ξ(1620) resonance is an interesting state to study as it is believed to be the doubly strange analogue to the Λ(1405), since we have the ability to measure the line shape in various decay branches with unprecedented precision. The study of cascades looks to be appealing from a theoretical perspective due to the symmetry from two medium-mass s-quarks. This work focuses on the analysis of CLAS12 data collected at Jefferson Lab to study the production mechanisms and decays of excited Ξ- states that are not well established, with the aim of determining branching ratios and extracting the quantum numbers of the new and missing Ξ states.

Speaker: Asli Acar

83 Machine-Learning Particle Identification Methods for SoLID Detector Electromagnetic Calorimeter Beam Test

As nuclear physics moves solidly into the 21st century, we are in need of high-coverage, high-rate detection of events. The Solenoidal Large Intensity Device SoLID seeks to fill that need for a large-acceptance, high-luminosity device in Hall A of Jefferson Lab. In keeping with the theme of modernization, the SoLID collaboration has sought to bring cutting-edge technologies and methods into the standard operating procedures, including the use of Machine Learning ML for data analysis. In order to characterize the electromagnetic calorimeter modules for SoLID, the collaboration has conducted a beam test study to validate our hardware. A critical component of this study is establishing SoLID’s ability to distinguish between different particles, or particle identification PID. During this beam test, we have worked to bridge the gap between simulation and data in order to improve the accuracy of GEANT-based simulation and provide insight into analyzing our data. By accomplishing this, we explore traditional PID methods, as well as ML PID methods for analyzing beam test data. During benchmarking of PID performance using simulation, we show that ML algorithms outperform traditional cuts with higher electron efficiency and pion rejection for a range of momentum bins and trigger settings. We additionally show ML PID methods allow for complex combinations of models for individual detectors without the characteristic loss in efficiency associated with traditional methods. After further validation, we seek to apply ML and traditional PID methods to beam test data to complete the proof of concept and laid foundational work for ML PID methods for a fully-realized SoLID, thus bringing this collaboration onto the same level as CLAS and GlueX.

Speaker: Darren Upton (Old Dominion University)

dwupton_SoLID_ML_PID.pdf

84 MOLLER

The MOLLER (Measurement Of Lepton-Lepton Electroweak Reaction) experiment is an ultra-precise measurement of the parity-violating asymmetry, APV, in purely leptonic Møller interactions between longitudinally polarized electrons and unpolarized electrons in a liquid hydrogen target at momentum transfer Q2 < mZ. The APV measurement is predicted to be ~33ppb and will be measured to an overall uncertainty of 0.8ppb, or 2.4% relative accuracy. Ultimately, the MOLLER experiment’s goal is to measure the weak charge of the electron, which with this level of precision, would give insight into new physics beyond Standard Model at the TeV scale.

Speaker: Matthew Ryan Conaway (Ohio U.)

HUGS_PRESENTATION.pdf

85 Measurements of 2N and 3N SRCs

Inclusive electron scattering experiments performed at JLab have been a powerful tool to probe nuclear structure. Mean field theory has been a very accurate model at predicting a variety of properties of the nucleus. However, it fails to predict the distribution of high momentum nucleons within the nucleus. To answer this, the SRC picture points to multi-nucleon Short-Range Correlations (SRCs) which predicts that a combination of two (and potentially three or more) nucleons come within close proximity of each other and feel the repulsion of a short range nuclear force. This poster will show recent 2N SRC measurements as well as the progress towards obtaining 3N SRCs from E12-06-105.

Speaker: Jordan O'Kronley (U. of Tennessee Knoxville)

poster_HUGS2024_Jordan_OKronley.pdf

86 Baryon Spectroscopy from Lattice QCD

The reconciliation of observable properties of hadrons with the fundamentals of QCD has remained a persisting challenge in modern nuclear theory. Lattice QCD is a numerical method that bridges the gap between first-principles QCD and observables in nuclear systems in the strong coupling regime. By casting a scattering problem onto a finite, discretized spacetime lattice, one obtains a finite-volume energy spectrum that corresponds directly to an infinite volume scattering amplitude. Much progress has been made in calculations of meson-meson interactions from Lattice QCD by the hadron spectroscopy community, but the baryon sector has seen little exploration. Because of the significant contribution of three-body effects, baryon-meson and baryon-baryon calculations are ideal for developing the finite-volume formalism to accommodate the analysis of three-body scattering processes. We present an overview of a lattice calculation of a baryon-meson scattering amplitude.

Speaker: Nicholas Chambers (William & Mary)

HUGS Poster.pdf

Poster session

87 Deuteron Electrodisintegration at Super High Missing Momenta (D(e,e'p)n)

The deuteron electro-disintegration $D(e,e'p)n$ experiment aims to measure D(e,e'p)n cross sections at high $Q^2$, $x_{Bj}~1$, and missing momenta $p_m>600$ MeV/c with great statistical precision. To obtain a greater understanding of the strong nuclear force, we must probe the nucleus at sub-fermi distances where the nucleons overlap. In this region, the nucleon-nucleon (NN) interaction potential is not well understood as there is a lack of experimental data for missing momenta beyond $500$ Mev/c 1. The deuteron is the simplest bound NN system, which makes it the perfect starting point for understanding the strong nuclear force, especially at extremely short distances. This experiment was conducted in Experimental Hall C of Jefferson Lab (JLab). JLab houses the Continuous Electron Beam Accelerator Facility (CEBAF). CEBAF's 11 GeV electron beam is incident on a liquid deuterium target, and the recoil proton and electron are detected by Hall C's High Momentum Spectrometer (HMS) and Super High Momentum Spectrometer (SHMS), respectively. The recoil neutron momentum, i.e., the missing momentum, is then reconstructed from the reaction's kinematics. This ideal reaction, in which the momentum of the nucleons can be directly correlated, is described by the plane wave impulse approximation (PWIA). Other short-range correlation processes (final state interactions (FSI), meson exchange currents (MEC), and isobar configurations (IC)) can be suppressed under carefully selected kinematics 1. Previous results published by C.Yero et. al. 2 showed a discrepancy between the data and the non-relativistic theoretical models in the large missing momentum regime. In the spring of 2023, we took data up to even higher missing momenta, which will allow us to extend the cross-section domain beyond 1.0 GeV with great statistics. The data is currently being analyzed and should be ideal for testing fully relativistic deuteron wave function models. 

I would like to thank my professors Werner Boeglin and Misak Sargsian, as well as my mentor Carlos Yero. This work is supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under the contract DE-SC0013620.

Speaker: Gema Villegas Minyety (Florida International University)

Deep_HUGS2024_Poster_GemaVillegas.pdf

88 Primakoff photoproduction of η-mesons in the PrimEx experiment at Jefferson Lab

The PrimEx experiment at Jefferson Lab aims to extract the η radiative decay width via the Primakoff effect. This process can be seen as the inverse process of the decay of the η-meson into two photons. The experiment collected data on liquid helium target in three different phases, 2019, 2021 and 2022 utilizing the GlueX detector in Hall-D. By extracting a high precision measurement of the radiative decay of this meson, we will be able to obtain information about the ratio of the light quark masses, and the η-η' mixing angle, which will ultimately contribute understand QCD symmetries.

Speaker: Viviana A Arroyave Flechas (FIU)

Poster_Final.pdf

89 Rho^0 Photoproduction off of Protons in CLAS6

Vector meson photoproduction observables may provide insight into the internal structure of the nucleon. This work aims to extend world data on determinations of differential cross section for rho^0 photoproduction off protons. The analysis is performed using data from by the CLAS6 detector during the g12 run period for beam energies between 1.15 and 5.45 GeV and -t between 0 and 5 GeV^2.

Speaker: Brandon Tumeo (University of South Carolina)

poster_HUGS2024_Brandon_Tumeo.pdf

90 AI for data analysis and preservation

A(i)DAPT is a program which aims to utilize AI techniques, in particular generative modeling,
to support Nuclear and High Energy Physics experiments. Its purpose is to extract physics directly from data in the most complete manner possible. Generative models such GANs are employed to capture the full correlations between particles in the final state of nuclear
reactions. This many-fold program will allow us to to achieve various goals including accurately fitting data in a multidimensional space and unfolding detector effects to minimize their impact on the relevant physics. Moreover, it will enable us to store a large amount of realistic-like data in an extremely compact format and to extract reaction amplitudes in an alternative way. We aim at incorporating universality of scattering amplitudes, training networks with different kinematics of the same final state or different final states to recover the underlying physics.

Speaker: Tommaso Vittorini (Genova University - INFN)

poster_HUGS2024_Tommaso_Vittorini.pdf

HUGS social: Farewell Picnic

Fri, June 14

Student seminars

91 Exploration into the Baryon structure

There is great interest in studying the elastic and transition form factors of baryon excitations. As a first step it is necessary to understand the structure within the baryons such as masses, decay constants, etc., I will show how we study from the masses to the form factors of the baryons using a formalism based on terms of a contact interaction.

Speaker: GUSTAVO PAREDES TORRES (IFM-UMSNH)

ExplorationIntoTheBaryonStructure-GPT.pdf

92 Impact of parity-violating DIS on the weak mixing angle and nucleon strangeness

At present, there is a lack of experimental data constraining the strange nucleon PDFs' dependence on the parton momentum fraction and the weak mixing angle's low-$Q^2$ behavior. The parity-violating asymmetry from the neutral-current deep inelastic scattering of electrons from proton and deuterium targets, which will be measured by the upcoming SoLID experiment at Jefferson Lab, possesses a unique sensitivity to the strange PDFs and electroweak parameters of the standard model. In this talk we explore these sensitivities and perform a global analysis incorporating pseudo-data from simulations based on SoLID experimental projections with radiative corrections to the asymmetry, for the unpolarized PDFs and weak mixing angle. We find a sizable constraining power of future $A_{\rm PV}$ data on the high-$x$ behavior of the nucleon strangeness and an unprecedented resolving power on the weak-mixing angle at low-$Q^2$.

Speaker: Richard Whitehill (Old Dominion U.)

HUGS2024_rwhitehill.pdf

93 Proton Form Factor Measurement Using Recoil Polarization Method

This research project is centered around Jefferson Lab (JLab) experiment E12-07-109 (GEp-V) to measure the proton electromagnetic form factor ratio G_E^P/G_M^P. GEp-V will use the recoil polarization technique in which a longitudinally polarized electron beam is scattered off a fixed unpolarized proton target. The resulting transfer of polarization to the recoiling proton is measured and the ratio of the longitudinal and perpendicular components is directly proportional to the form factor ratio. A large spectrometer will measure this polarization ratio. Crucial to this measurement are the tracking detectors known as GEMs which measure particle trajectories to high precision.

Speaker: Jacob McMurtry (U. of Virginia)

HUGS Talk.pdf

HUGS Talk.pptx

94 Flavor asymmetry of light sea quarks in proton : A light-front spectator model

We formulate a light-front spectator model for the proton that incorporates the presence of light sea quarks. In this particular model, the sea quarks are seen as active partons, whereas the remaining components of the proton are treated as spectators. The proposed model relies on the formulation of the light-front wave function constructed by the soft wall AdS/QCD. The model wave functions are parameterized by fitting the unpolarized parton distribution functions of light sea quarks from the CTEQ18 global analysis. We then employ the light-front wave functions to obtain the sea quarks generalized parton distribution functions, transverse momentum dependent parton distributions, and their asymmetries, which are accessible in the upcoming Electron-Ion-Colliders. We investigate sea quarks' spin and orbital angular momentum contributions to the proton spin.

Speaker: Poonam Choudhary (IIT Kanpur)

HUGS SLIDES Poonam.pdf

10:00 AM Break

Student seminars

95 Higher Twist Proton Distributions in the Light-Front Quark-Diquark Model

The plan for future Electron-Ion collider (EIC) aims to open the regime of experimental detection of distribution functions (DFs) consisting of a new range of polarization states of parton and its parent nucleon. This demands the theoretical advancement of parton distributions at all levels of twist. By detangling the quark-quark generalized parton correlation functions (GPCFs) at various limits, we have obtained the higher twist (twist-3 and/or twist-4) parton distribution functions (PDFs), generalized parton distributions (GPDs), transverse momentum-dependent parton distributions (TMDs) and generalized transverse-momentum dependent parton distributions (GTMDs) in the light-front quark-diquark model. These DFs have been expressed in the overlap form as well as the explicit form of the light-front wave functions (LFWFs) while considering both scalar and vector diquark possibilities. The model-dependent and independent relations of these distributions have also been explored extensively.

Speaker: SHUBHAM SHARMA (Dr. B.R. Ambedkar National Istitute of Technology, Jalandhar, India)

HUGS_2024_SS.pdf

96 Heavy Ion Collisions and Elliptic Flow in Quark-Gluon Plasma (QGP)

This presentation explores heavy ion collisions and their role in understanding quark gluon plasma (QGP). The experiments conducted at the Large Hadron Collider (LHC) and the Relativistic Heavy Ion Collider (RHIC) allow for the study of the properties and dynamics of QGP and the processes of quantum chromodynamics (QCD). These collisions provide insight into one of the simplest forms of complex quantum matter. This presentation focuses on the collective phenomena in non-central nuclear collisions, studying the azimuthal anisotropy resulting from these events. Studying anisotropic collective flow, specifically elliptic flow, reflected in the momentum distribution of the resulting particles, serves as a key probe for understanding the QGP created in heavy ion collisions.

Speaker: Sabrina Hernandez (U. of Houston)

sabrina_hernandez_hugs.pdf

97 Chiral Phase Transition in Lattice Gauge Theory and Signatures of Chiral Symmetry Restoration

This talk examines the chiral phase transition in Lattice Quantum Chromodynamics (QCD) at high temperatures, a key aspect of strongly interacting matter and a signature of the Quark-Gluon Plasma (QGP). We will explore chiral symmetry restoration in both the chiral limit and with massive quarks, and its implications for the QCD phase diagram. Key focus areas include the behavior of the Wilson line and chiral condensate susceptibilities as order parameters. We will discuss physical observables such as hadron masses, widths, and branching ratio modifications, which are measurable in heavy-ion collision experiments and essential for validating theoretical predictions. This presentation emphasizes bridging theoretical advancements in Lattice QCD with experimental efforts to enhance our understanding of matter under extreme conditions.

Speaker: Adel Bensaoula (U. of Houston)

main.pdf

98 Soft function study in $p p \rightarrow V + j + X$ processes

Generally, low energy Quantum Chromodynamics cannot be solved by perturbative methods. To overcome this discrepancy with respect to the high energy scale, which allows a perturbative calculation, a scale factorization can be performed through SCET. In this work, we will begin by outlining a brief introduction to the SCET formalism and we will also show that it is possible to decouple, in the Lagrangian, the collinear fields from the soft ones. However, it is essential to introduce the Wilson lines, which allow preserving the gauge invariance. Then, the study focuses on calculating the soft function associated to the interaction $p p \rightarrow V + j + X$. The zero-bin subtraction process and the logarithmic resummation are also used to eliminate the rapidity divergences and, through the equations of the renormalization group, a soft function without divergences is extracted. Finally, the soft function anomalous dimension is derived, which is necessary to perform a subsequent consistency check to make our results reliable.

Speaker: Gloria Tejedor García (Old Dominion U.)

SOFT_FUNCTION_SLIDES__GLORIA_TEJEDOR_GARCÍA_.pdf

11:30 AM Lunch

Farewell and prizes