Conveners
Plenary: Form Factors
- Charlotte Van Hulse (IJCLab)
Plenary: Applications
- Thomas Theis (NC State University)
Plenary: TMD I
- Andrea Signori (University of Turin and INFN)
Plenary: TMD II
- Oleg Eyser (BNL)
Plenary: TMD III
- Alexei Prokudin (JLab)
Plenary: Low Energy
- There are no conveners in this block
Plenary: GPDs
- Paweł Sznajder (National Centre for Nuclear Research)
Plenary: Heavy Ions
- Zuo-tang Liang (Shandong University)
Plenary: Inclusive/LHC
- Sebastian Kuhn (Old Dominion University)
Plenary: Instrumentation/Future
- Patrizia ROSSI (JEFFERSON LAB)
Form factors are Lorentz invariant functions describing the internal structure of a system. In particular, they encode how physical properties like charge, energy, momentum, pressure, ... are spatially distributed. While nucleon electromagnetic form factors have been studied for a long time, the first extraction of nucleon gravitational form factors from experimental data was reported in 2018,...
The gravitational form factors (GFFs) are an elegant way to describe the structure of nucleons and nuclei. Their Fourier transform allow a a description of the spatial distribution of the mass, angular momentum , pressure and shear forces densities for both quarks and gluons in the nucleon. The GFFs have been the target of an intensive investigation at Jefferson Lab and form the basis of...
The polarizabilities of a composite system such as the proton are elementary structure constants. They describe its response to an external electromagnetic (EM) field and quantify the deformation of the charge and magnetization distributions inside the proton caused by the electric or magnetic field, respectively. When studied through the virtual Compton scattering process, the virtuality of...
The nitrogen–vacancy (NV) quantum defect in diamond is a leading modality for magnetic, electrical, temperature, and pressure sensing with high spatial resolution and wide field-of-view, operating under both ambient and extreme conditions. This quantum sensing technology has diverse applications across the physical and life sciences — from probing magnetic materials to NMR of single cells,...
The use of spin polarized fuel could increase D-T fusion reactivity by a factor of 1.5 and, owing to alpha heating, increase fusion Q in ITER even more [1]. The use of polarized D and 3He in an experiment avoids the complexities of handling tritium, while encompassing the same nuclear reaction spin-physics, making it a useful proxy to study issues associated with full D-T implementation. 3He...
Quantum simulation may open the door to addressing a range of computationally intractable problems in strong-interaction physics. In particular, with its reliance on Hamiltonian methods, quantum-simulation and quantum-computing methods are ideal for accessing a wealth of static and dynamical properties of hadrons, nuclei, and dense matter, including a range of structure functions, dynamical...
I will discuss the three-dimensional (3D) nucleon structure encoded in the Transverse Momentum Dependent distributions, providing an overview of the current knowledge. Using several examples, I will demonstrate the significance of the 3D structure and its relation to other topics in hadronic physics.
A new era for the exploration of hadron structure has begun with the Jefferson Lab 12 GeV program and the planned Electron Ion Collider. The new generation of experiments will allow us to probe the quantum correlation function (QCFs) of quarks and gluons that emerges from the theory of strong interactions. Since QCFs are not direct physical observables, they need to be reconstructed from...
We present ongoing studies and some future
measurements with hadrons in electroproduction at Jefferson Lab
COMPASS is a fixed target high energy physics experiment located at the M2 beamline (SPS, North Area) at CERN. It is the longest-running CERN experiment (2002-2022), with a unique and diverse physics programme focused on nucleon structure and spectroscopy measurements.
Experimental results obtained by COMPASS during phase-I (2002-2011) and phase-II (2012-2022) for a broad spectrum of nucleon...
Recently years have seen significant progress in the first-principles calculation of TMD physics from lattice QCD. In this talk, I will describe the theoretical method for calculating both quark and gluon TMDs, which has been developed under the framework of large-momentum effective theory. I will then review its most recent applications to the non-perturbative quark TMDs and their rapidity...
Jets of hadrons produced at high-energy colliders provide experimental access to the dynamics of asymptotically free quarks and gluons and their confinement into hadrons. We highlight recent developments in the theoretical understanding of jet substructure, focusing in particular on the "energy correlator" observables, and their application to the spin physics program.
Since key theoretical developments 15 years ago that allowed more rigorous comparison of jets between experiment and theory, jets have become a powerful multipurpose tool in high-energy nuclear and particle physics. Linking partonic and hadronic degrees of freedom, they can provide access to spin-spin and spin-momentum correlations both in the nucleon and in the process of hadronization....
The proton radius puzzle began in 2010 when the CREMA Collaboration released their measurement of the proton radius (Pohl et. al (2010)) from muonic hydrogen spectroscopy: rp=0.84184(67) fm, This was five standard deviations smaller that the accepted CODATA value at that time (0.8768(69) fm), and sparked an enduring and intriguing puzzle. This puzzle has been addressed in repeated electron...
The 1.6 GeV electron accelerator is operated by the institute for nuclear physics on the campus of the Mainz University. It will be complemented by a high intensity low energy accelerator MESA which can be operated in energy recovery mode. The spin physics program at MAMI and MESA will be summarized.
The study of permanent and oscillating Electric Dipole Moments (EDMs) of
fundamental particles for charged hadronic systems such as proton and deuteron (possibly also 3 He) can help to find answers to two of the most important current scientific questions in particle physics and cosmology: (i) What happened to antimatter after the Big Bang? and (ii) What is dark matter?
The current Standard...
Recent advancements have facilitated the approximate computation of light-cone correlation functions in lattice QCD through the evaluation of their Euclidean counterparts. In this presentation, we will provide a brief overview of these significant developments that have direct implications for Generalized Parton Distributions.
Generalized Parton Distributions (GPDs) are nowadays the object of an intense effort of research, in the perspective of understanding nucleon structure. They describe the correlations between the longitudinal momentum and the transverse spatial position of the partons inside the nucleon and they can give access to the contribution of the orbital momentum of the quarks to the nucleon...
Ultra-Peripheral Collisions (UPCs) at the LHC are the highest energy photon-proton and photon-nucleus collisions accessible anywhere, while the future EIC will collide electrons with protons and nuclei, allowing high-precision measurements over a wide range of Q^2. These collisions are important probes of structure functions and generalized parton distributions (GPDs), with the capability to...
Coherent exclusive reactions with nuclei give access to nuclear generalized parton distributions (GDPs) which can be used to perform a three-dimensional tomography of bound nuclear states in quark and gluon degrees freedom. I will give an overview of existing phenomenology on nuclear GPDs, highlighting that for the lightest nuclei we have targets that have a simpler (4He, spin zero) and...
Huge orbital angular momenta (OAM) are produced perpendicular to the reaction plane in non-central high energy heavy-ion collisions, and part of such huge OAM are tranferred to the hot and dense matter created in collisions. Due to the shear of the longitudinal flow particles with spins can be polarized via the spin-orbit coupling in particle scatterings. Such a type of spin polarization with...
The study of spin dynamics in heavy ion collisions has emerged as a pivotal avenue for comprehending the intricate interactions of fundamental strong force as well as the angular momentum of subatomic particles. This talk delves into the realm of spin physics within the context of high-energy heavy ion collisions. We explore the multifaceted roles that spin plays in elucidating the properties...
Recent developments in the theory of polarized scattering in the small-$x$ regime have led to the construction of novel evolution equations for helicity at small $x$. In recent years, these small-$x$ helicity evolution equations have been used in global analyses of inclusive DIS and now SIDIS cross sections, providing a formalism capable of predicting the unmeasured spin hiding below the...
High performance polarized beam and targets at JLab enabled an extensive program to measure nucleon spin structure functions with high precision. This talk will highlight the recent JLab spin experiments, including the measurement of the neutron spin asymmetry (A1n) in the valance quark (high-x) region and the measurement of the neutron spin moment d2 in medium-high Q2 region to study...
We review the current status of the nucleon's helicity PDFs. We describe
recent progress on "global" analysis of the distributions, highlighting
advances on the theoretical side especially in terms of higher-order
perturbative calculations. We discuss the relevance of these advances
for the spin program at the future EIC.
Fixed-target pp and pA collisions with a proton beam at the TeV scale provide unique laboratories for studying of the nucleon’s internal dynamics and, more in general, for investigating the complex phenomena that arise in the non-perturbative regime of QCD. Due to the significant boost of the reaction products in the laboratory frame, fixed-target collisions allow to access the poorly explored...
Willy Haeberli left us a rich 50-year nuclear polarization physics legacy. He trained generations of students, post-docs, and international collaborators in the intracacies of nuclear spin physics measurements. This talk will reflect on my time spent working in Willy’s large University of Wisconsin research group in the 1960s. His insight guided our development of polarized ion sources and...
The Electron-Ion Collider is gearing up for "Critical Decision 2", the project baseline with defined scope, cost and schedule. Lattice designs are being finalized, and preliminary component design is being carried out. Beam dynamics studies such as dynamic aperture optimization, instability and polarization studies, and beam-beam simulations are continuing in parallel. We report on the latest...
The CEBAF accelerator at Jefferson Lan delivers the world’s highest intensity multi-GeV electron beams. The 12 GeV era at the laboratory is well underway, with many important experimental results already published and approved experiments planned for the next decade. At the same time, the CEBAF community is looking toward its future and the science that could be obtained through a...
Since key theoretical developments 15 years ago that allowed more rigorous comparison of jets between experiment and theory, jets have become a powerful multipurpose tool in high-energy nuclear and particle physics. Linking partonic and hadronic degrees of freedom, they can provide access to spin-spin and spin-momentum correlations both in the nucleon and in the process of hadronization. ...
