The 11th workshop of the APS Topical Group on Hadronic Physics

Session

Plenary Session - Room 255B

Mar 14, 2025, 8:30 AM

255B (Anaheim Convention Center)

Conveners

Plenary Session - Room 255B: I (Chair: Bjoern Schenke)

• Bjoern Schenke (Brookhaven National Lab)

Plenary Session - Room 255B: II (Chair: Bernd Surrow)

• Bernd Surrow (Temple University)

Plenary Session - Room 255B: III (Chair: Daniel Pitonyak)

• Daniel Pitonyak (Lebanon Valley College)

Plenary Session - Room 255B: IV (Chair: Megan Connors)

• Megan Connors (Georgia State University)

68. Nucleon spin structure in the strong QCD regime (2023 GHP Fellow)

Alexandre Deur (Thomas Jefferson National Accelerator Facility)

3/14/25, 8:30 AM

plenary

The nucleon spin structure is an important aspect of hadronic physics, and spin sum rules have been extensively used to study it. We will report on the latest experimental results published on nucleon spin sum rules. The data were taken at Jefferson Lab in Hall A and B by experiments E97-110 and EG4, respectively. They covered the very low $Q^2$ domain, down to $Q^2\sim 0.02$ GeV${}^2$, Chiral...

14. Hadron spectroscopy with GlueX

Sean Dobbs (Florida State University)

3/14/25, 9:00 AM

plenary

The GlueX experiment at Jefferson Lab has collected a world-leading set of photoproduction data, which is being used to address many outstanding problems in hadronic physics. I will present the status of the search for hybrid mesons with GlueX data, including recent results on polarization observables and partial wave analyses. I will also discuss a selection of other recent results,...

3. Recent Phenomenological Studies of 3D Momentum-Space Hadron Structure

Chiara Bissolotti (Argonne National Laboratory)

3/14/25, 9:30 AM

plenary

In this talk, I will provide an overview of recent theoretical developments in understanding the three-dimensional momentum-space structure of hadrons.
Transverse Momentum Distributions (TMDs) are essential for describing processes like semi-inclusive deep inelastic scattering (SIDIS), Drell-Yan production, and hadron-hadron collisions at low transverse momentum, where transverse...

94. First year(s) results from sPHENIX

Charles Hughes (Iowa State University)

3/14/25, 10:00 AM

plenary

Super Pioneering High Energy Nuclear Interaction eXperiment (sPHENIX) is a high energy nuclear physics detector which is part of the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory (BNL) on Long Island, New York. sPHENIX is designed primarily to measure Quark-Gluon Plasma (QGP), produced in heavy-ion collisions at RHIC. QGP is a short-lived, hot, dense partonic medium...

6. Experimental Road to a Charming Family of Tetraquarks ... and Beyond

Kai Yi (Nanjing Normal university)

3/14/25, 11:00 AM

plenary

Discovery of the X(3872) meson in 2003 ignited intense interest in exotic (neither qq¯ nor qqq) hadrons, but a cc¯ interpretation of this state was difficult to exclude. An unequivocal exotic was discovered in the Zc(3900)+ meson -- a charged charmonium-like state. A variety of models of exotic structure have been advanced but consensus is elusive. The grand lesson from heavy quarkonia was...

47. EIC Theory Overview

Andrey Tarasov (North Carolina State University)

3/14/25, 11:30 AM

plenary

The Electron-Ion Collider (EIC) at the Brookhaven National Laboratory is a versatile machine which is designed to address some of the most profound questions about the properties of nuclear matter. To unravel the rich structure of hadrons the EIC will provide the precise imaging of the dense QCD medium inside protons and nuclei. However, understanding of the hadron structure is not possible...

110. Anticipated First Results from the Electron Ion Collider

Rosi Reed (Lehigh U)

3/14/25, 12:00 PM

plenary

The Electron-Ion Collider (EIC) is poised to address fundamental questions in nuclear science, as outlined by the National Academy of Science Report and detailed in the Yellow Report. Central to its mission is the understanding of nucleon structure by disentangling the contributions of quarks, gluons, and their orbital angular momentum. The EIC will allow us to determine how much of the mass...

84. UPCs at RHIC and the LHC

Zhoudunming Tu (BNL)

3/15/25, 8:30 AM

plenary

Ultra-peripheral collisions (UPCs) at the Relativistic Heavy Ion Collider and the Large Hadron Collider offer a unique laboratory for exploring the interplay between quantum electrodynamics and quantum chromodynamics in the presence of intense electromagnetic fields. These collisions, characterized by impact parameters exceeding the sum of the radii of the colliding nuclei, generate powerful...

88. Charming Experiment Finds Gluon Mass in the Proton

Sylvester Joosten (Argonne National Laboratory)

3/15/25, 9:00 AM

plenary

Understanding the origin of the proton's mass is a fundamental question in nuclear physics. The proton’s three valence quarks account for only a small fraction of its total mass, with the majority arising from the strong force, mediated by gluons.

Recent experiments studying near-threshold J/ψ production at Jefferson Lab have provided new insights into the proton's mass distribution. I will...

86. Experimental outlook for Color Transparency phenomena

Holly Szumila-Vance (FIU)

3/15/25, 9:30 AM

plenary

Searching for evidence of Color Transparency (CT) is a vibrant experimental effort to observe hadrons in a small color-neutral transverse size configuration in the nucleus. CT is fundamentally predicted by quantum chromodynamics and is expected to be observable in exclusive scattering as a reduction of final state interactions (FSI) of the point-like hadron with the nuclear medium. The...

11. Understanding Hadron Structure by combining Lattice QCD and Phenomenology

Joe Karpie (Jefferson Lab)

3/15/25, 10:00 AM

plenary

CD is a difficult theory of hadrons because it is described entirely unobservable partons, the quarks and gluons. In order to access parton distributions, hadronic observables such as experimental cross sections or lattice QCD matrix elements must have factorization approximations separated hadronic and partonic distance scales. These observables are sensitive to different regimes in momentum...

69. Results from the Relativistic Heavy Ion Collider Beam Energy Scan II

Shusu Shi (Central China Normal University)

3/15/25, 11:00 AM

plenary

In this talk, we will present the recent results from the Relativistic Heavy Ion Collider Beam Energy Scan II, with a special focus on the exploration of the QCD phase structure.

77. Probing the quark gluon plasma with jets

Yi Chen (Vanderbilt University)

3/15/25, 11:30 AM

plenary

In ultrarelativistic heavy ion collisions, an exotic phase of matter known as the quark-gluon plasma (QGP) is created. The QGP is a thermodynamic system characterized by extremely high temperatures and energy densities, where quarks and gluons can move beyond the confines of nucleons. Recent years have seen a multitude of studies uncovering many intriguing phenomena of QGP. Jets, which are...

85. Energy-Energy Correlators and Connections to Transverse Momentum Structure

Zhongbo Kang (UCLA)

3/15/25, 12:00 PM

plenary

In this talk, we will review recent progress in utilizing energy-energy correlators to study hadron structure. Specifically, we will explore how energy-energy correlators with azimuthal angle dependence can be employed to investigate the transverse momentum-dependent (TMD) structure of hadrons and the phenomenon of small-$x$ gluon saturation. Additionally, we will discuss their application in...