An important tool in studying the sub-femtoscale spacetime structure of matter in ultrarelativistic heavy-ion collisions is Hanbury-Brown-Twiss (HBT) intensity interferometry of identical particles in the final state of such collisions. We propose that a variant of the entanglement enabled intensity interferometry (E2I2) framework introduced by Cotler and Wilczek can provide a powerful alter-...
In recent years, Low’s soft theorem up to sub-leading order has garnered renewed interest due to its deep connection with asymptotic symmetries. In this talk, I will demonstrate that, in the small x limit, Low’s soft theorem can be derived from a quasi-classical field approach by solving classical Yang-Mills equations up to sub-eikonal order. Furthermore, I will discuss how gluon saturation...
The Color Glass Condensate (CGC) effective theory and the collinear factorization at high-twist (HT) are two well-known frameworks describing perturbative QCD multiple scatterings in nuclear media. It has long been recognized that these two formalisms have their own domain of validity in different kinematics regions. In this work, we argue that a consistent matching between both frameworks, in...
We investigate the off-shell pion electromagnetic
form factors using phenomenological relativistic
constituent quark models. These models, which treat the
pion as a composite of massive, structureless quarks,
employ the Mandelstam approach to calculate the
microscopic form factors. Each model is parameterized by
two scale parameters fitted to the pion decay constant and...
We introduce the ``target jet" in the forward region of the ion in deep inelastic scattering (DIS) events with a jet radius which depends on the DIS kinematics in order to separate the current and target regions in the laboratory frame. We show that target jet substructure and its correlation with the substructure of the leading jet is sensitive to the internal structure of nucleon and ion,...
I will discuss low-energy nuclear physics at the future Electron-Ion Collider (EIC) at Brookhaven. By comparing the standard theory of electron-nucleus scattering with the equivalent photon method applied to Ultraperipheral Collisions (UPC) at the Large Hadron Collider (LHC) at CERN. In the limit of extremely high beam energies and small energy transfers, very transparent equations emerge. We...
In this talk I will review the lattice QCD calculation of TMD physics and its impact on the experiments at the future Electron-Ion Collider. I will discuss the theory development centering around the large-momentum effective theory (LaMET) and the newly proposed Coulomb-gauge correlation functions within this framework. Besides, I will review the systematic lattice calculation of the...
The study of the nucleon's 3-D momentum and spin structure emerged from studies of both leading power (LP) and next-to-leading power (NLP) contributions to SIDIS observables. Although typically suppressed by $\Lambda_{\tiny QCD}/Q$, an understanding of the NLP TMD observables is essential for accurately describing SIDIS, and for properly extracting LP effects from SIDIS data. A key NLP...
Semi-Inclusive Deep Inelastic Scattering (SIDIS) is a core physics program at the future Electron-Ion Collider. Precision measurements with the ePIC detector at the EIC will elucidate the polarized and unpolarized quark-gluon structure of the nucleons and nuclei with an unparalleled combination of kinematic reach, phase space, and precision. The ability of the EIC to accelerate a wide range...
The chiral anomaly in polarized deeply inelastic scattering manifests itself as an infrared pole of the box diagram in exact off-forward kinematics. The mechanism of the pole regularization is extremely subtle. I will show that such mechanism in QCD is fundamentally different from QED where the anomaly pole vanishes for finite lepton mass. Instead in QCD the mechanism has to do with the...
There have been rapid developments in the direct calculation in lattice QCD (LQCD) of the Bjorken-x dependence of hadron structure through large-momentum effective theory (LaMET) and other similar effective approaches. These methods overcome the previous limitation of LQCD to moments (that is, integrals over Bjorken-x) of hadron structure, allowing LQCD to directly provide the kinematic...
Generalized parton distributions (GPDs) are functions of four variables, one of which is a renormalization scale. The functional dependence on this renormalization scale is fully determined by a renormalization group equation---or "evolution equation"---that can be derived from perturbative QCD. A fast numerical implementation of the scale evolution is vital to any global phenomenology effort....
We discuss the current status of the extraction of nuclear Parton Distribution Functions (nPDFs) and highlight the opportunities that experimental measurements at the EIC can provide. Specifically, we focus on recent improvements and challenges on the determination of the nuclear Strange and Gluon distributions, the flavor separation and the dependence on the nuclear mass number $A$. Each of...
Central goals of nuclear physics are to understand the spatial structure of the proton, as well as the mechanisms that generate its mass and spin distributions, emerging from quark and gluon interactions via the strong force in QCD. Vast resources have been committed to experimental facilities - foremost the upgraded 12 GeV Jefferson Lab accelerator and the planned Electron-Ion Collider (EIC)...
Having more than one detector is essential for independent cross checks of results and confirmation of discoveries. This was recognized as a guiding principle in the past, and will be of particular importance for the EIC, which will be a unique facility worldwide. Experience from HERA also shows that if the two detectors are not too different, data can be combined, reducing the overall...
In recent years, a number of studies have explored the potential of jet observables to contribute to various aspects of the scientific mission at the future Electron-Ion Collider (EIC) and have led to the recognition that jets will play an important role at the EIC. This talk will provide an overview of jet measurements at the EIC, highlighting the ways they both complement more traditional...
I will present a series of studies carried out by PDF groups on the impact of EIC pseudodata in constraining collinear PDFs at up to approximate N3LO in QCD. This will include the influence of inclusive EIC DIS neutral and charged current electron-proton data on the HERAPDF and MSHT global PDF determinations, as well as deuteron and positron data on CT global PDFs. For all cases studied,...
Exclusive C = +1 quarkonium production in high-energy electron-proton
scattering requires a C-odd t-channel exchange of a photon or three
gluons, i.e. the perturbative Odderon. The relative phase of the amplitudes
is determined by the sign of the light-front matrix element of the
eikonal color current operator $d^{abc} J^{+a} J^{+b} J^{+c}$. This is
non-vanishing only in the presence of...
In this talk, we will discuss the synergies between the physics results and prospects of ultra-peripheral heavy-ion collisions (UPC) at the LHC and those at the Electron Ion Collider (EIC). We will emphasize studies of gluon saturation and low-x physics, highlighting the connections and complementarities enabled by future LHC detector upgrades. Finally, we will discuss some of the experimental...
