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...
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,...
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...
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...
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...
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...
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...
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...
The overarching goal in the realm of strong QCD physics is to gain a fundamental understanding of the nature of hadronic matter and its interactions. This involves exploring how Quantum Chromodynamics (QCD) manifests itself on the scales relevant to the formation of hadrons. Identifying the underlying symmetries and degrees of freedom that dictate the observed properties of hadrons is crucial...
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...
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.
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...
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...
