Conveners
Parallels: nPDF/Saturation/Early
- Matthias Kaminski
- Matthias Kaminski (Max-Planck-Institu für Physik)
Parallels: nPDF/Saturation/Early
- Alexander Milov (Weizmann Institute of Science (IL))
Parallels: nPDF/Saturation/Early
- Gian Michele Innocenti (Massachusetts Inst. of Technology (US))
Parallels: nPDF/Saturation/Early
- Sangyong Jeon
- Sangyong Jeon
Parallels: nPDF/Saturation/Early
- Ramona Vogt
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Joseph Bahder (Central China Normal University)23/06/2026, 10:20Oral presentation
It has been of recent interest to the field to consider the novel coupling of jets to the collective flow of the QGP. In this talk, we systematically contrast the implementation of flow effects via direct inclusion at the level of the scattering potential ("jet drift") and via Lorentz boosted isotropic broadening ("global boost", e.g. CoLBT, MARTINI, etc.). First, we identify the precise...
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Mr Hasan Rahman (New Mexico State University)23/06/2026, 10:40Oral presentation
“Jet drift,” the preferential deflection of energetic particles in the direction of a flowing quark-gluon plasma, is one of a new class of asymmetric measures of jet modification. Arising from sub-eikonal interactions, jet drift goes beyond a trivial boost of frame and is sensitive to tomographic information about the medium. While energy loss alone is primarily sensitive to the path length...
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Alina Czajka (National Centre for Nuclear Research)23/06/2026, 11:00Nuclear PDFs, saturation, and early-time dynamicsOral presentation
The DIS dijet production at next-to-eikonal accuracy computed in a highly boosted gluon background field within the Color Glass Condensate (CGC) framework will be discussed. In particular, the back-to-back limit of the process will be considered.
Various types of finite-energy corrections and their structures as field strength insertions on the CGC Wilson lines will be shown. These...
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Eric Kolbusz (Wayne State University)23/06/2026, 11:201Nuclear PDFs, saturation, and early-time dynamicsOral presentation
We present the first results from the JETSCAPE multi-stage event generator framework for electron-ion collisions. The use of calibrated modules from the JETSCAPE framework allows common model parameters to remain unchanged between p-A and e-A simulations, thereby introducing novel constraints on these extensive simulations. The e-A event generator within the JETSCAPE framework simulates an...
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Andrea Giovanni Riffero (Creighton University (US))24/06/2026, 08:30Oral presentation
Ultraperipheral collisions (UPCs), where the impact parameter is larger than the sum of radii of two nuclei, provide a clean environment for rare multi-hadron resonances studies. The excited states of $\rho$ meson are predicted by theory, however purely known. The ALICE Collaboration has measured exclusive four-pion photoproduction cross section times branching ratio in UPCs of Pb-Pb at...
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Samuel Corey (Ohio State University)24/06/2026, 08:50Oral presentation
In ultraperipheral collisions, the invariant mass spectrum of $\pi^+ \pi^-$ pairs is very complex due to the numerous production channels and intermediate states. The most dominant component of this spectrum is $\gamma A \rightarrow \rho^0 (770) \rightarrow \pi^+ \pi^-$ production, and the invariant mass region surrounding the $\rho^0 (770)$ is well-described with the inclusion of photonuclear...
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Christopher Mc Ginn (Massachusetts Inst. of Technology (US)), Christopher McGinn (Massachusetts Institute of Technology)24/06/2026, 09:10Oral presentation
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Matthew Sievert (New Mexico State University)24/06/2026, 09:30Oral presentation
The soft sector of heavy-ion collisions is well described by relativistic hydrodynamics, with the final-state anisotropic flow coefficients $v_n$ arising from quasi-linear response to the initial-state eccentricities $\varepsilon_n$. Based on the principles of long-wavelength dominance in hydrodynamics and rotational symmetry, the initial-state eccentricities serve as “estimators” which...
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James Daniel Brandenburg (Ohio State University (US))24/06/2026, 10:40Oral presentation
Ultra-peripheral collisions offer a unique environment to study pomeron- and photon-induced reactions with heavy nuclei. Such interactions give access to a broad spectrum of final states, from light vector mesons to heavy quarkonia, and probe potentially exotic phenomena. Thanks to its fast and flexible data acquisition system, comprehensive particle identification, and excellent capability to...
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Adam Matyja (Polish Academy of Sciences (PL))24/06/2026, 11:00Oral presentation
Ultrarelativistic heavy ions generate intense electromagnetic fields that act as a prolific source of high-energy photons, inducing photonuclear reactions. While these processes are typically studied in ultraperipheral collisions (UPCs), where hadronic interactions are suppressed, an unexpected excess of $\mathrm{J}/\psi$ yield at very low transverse momentum ($p_{\mathrm{T}}$) has been...
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Prithwish Tribedy (Brookhaven National Lab)24/06/2026, 11:20Oral presentation
Heavy vector-meson photoproduction is a premier tool for imaging nuclear gluon distributions, traditionally via the momentum-transfer ($t$) dependence of exclusive cross sections. We show that in ultra-peripheral heavy-ion collisions (UPCs) the $J/\psi$ spin/decay angular structure provides a complementary handle for gluon tomography, enabled by the UPC ''two-source'' interferometer and...
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Pawel Rybczynski (AGH University of Krakow (PL))24/06/2026, 11:40Oral presentation
In ultra-relativistic heavy-ion collisions, the Lorentz-contracted electromagnetic fields of the ions generate intense quasi-real photon fluxes. These can interact with photons emitted by the oncoming nucleus, or with the nucleus itself, either directly in inelastic processes or diffractively via pomeron exchange. Diffractive photo-nuclear processes can produce exclusive vector mesons that are...
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Prof. Weiyao Ke (Central China Normal University)24/06/2026, 13:30Future experimental facilities and new techniquesOral presentation
Precision tomography of nuclear matter requires a unified description of three-dimensional in-medium parton evolution, including both longitudinal momentum evolution and transverse-momentum broadening. Importantly, for reaction in a finite-size nuclei, transverse-momentum–dependent (TMD) dynamics and Landau–Pomeranchuk–Migdal interference must be treated consistently. Using SCET with Glauber...
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Abhijit Majumder (Wayne State University)24/06/2026, 13:50Nuclear PDFs, saturation, and early-time dynamicsOral presentation
An enhancement in the transverse momentum distribution of Drell-Yan pairs was recently observed in $p$-$Au$ collisions, in the proton going direction, by the PHENIX experiment at RHIC. This observation, along with the absence of any enhancement in the nucleus going direction is consistent with the Cronin effect, and with the observed enhancement in a series of fixed target experiments at...
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Yu Fu (Duke university)24/06/2026, 14:10Nuclear PDFs, saturation, and early-time dynamicsOral presentation
The exploration of the high-energy nuclear landscape necessitates complementary theoretical frameworks to describe the transition from dilute to dense partonic systems. Two established paradigms for perturbative QCD multiple scatterings in nuclei are the Color Glass Condensate (CGC) effective theory, applicable in the high-density regime, and the collinear factorization-based high-twist (HT)...
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Dener De Souza Lemos (UNESP - Universidade Estadual Paulista (BR))24/06/2026, 14:30Oral presentation
The community is motivated by intriguing indications of parton saturation observed at RHIC and LHC, as well as by the large uncertainties in nuclear parton distribution functions (nPDFs) at small parton momentum fractions ($x$) and low-to-moderate $Q^{2}$. The unique photon detection capabilities of the STAR Forward Meson Spectrometer (FMS), covering the pseudorapidity range $2.6 < \eta < 4$,...
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Thomas Boettcher (Indiana University (US))24/06/2026, 15:201Oral presentation
With its unique forward geometry, the LHCb detector provides unprecedented access to very low Bjorken-$x$ inside the nucleon. Its excellent momentum resolution, vertex reconstruction, and particle identification enable precision measurements of charged and neutral light hadrons, as well as rarer probes such as heavy quarks, down to very low transverse momentum. These data provide unique...
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Patrycja Anna Potepa (AGH University of Krakow (PL))24/06/2026, 15:40Oral presentation
Top quarks produced in heavy-ion collisions are expected to be attractive candidates for probing the quark-gluon plasma, developing new information about the time structure strongly interacting matter, and probing nuclear parton distribution functions (nPDFs). This talk presents the observation of top-quark production in lead–lead (Pb+Pb) collisions at 5.02 TeV with the ATLAS experiment at the...
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Dr Georgios Krintiras (The University of Kansas (US))24/06/2026, 16:00Oral presentation
The production of top quarks in heavy ion collisions is a novel tool for investigating nuclear parton distribution functions at high Bjorken-x. Although a quark, the top has a short lifetime, decaying predominantly to a W boson and b quark pair, before hadronization. Leptonic final states from the subsequent W boson decay are thus effectively electroweak probes of the medium they traverse...
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Dima Shemyakin (Weizmann Institute of Science (IL))Oral presentation
In ultra-relativistic heavy-ion collisions, large rates of γγ processes arise from the intense electromagnetic fields generated by the colliding nuclei. These γγ interactions provide a powerful laboratory to study reactions that may be sensitive to physics beyond the Standard Model.
This talk presents the first differential fiducial measurements of γγ→τ+τ− production using 1.93 nb$^{−1}$ of...
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