Quark Matter 2025

Session

Parallel session 22

8 Apr 2025, 16:10

Goethe University Frankfurt, Campus Westend, Theodor-W.-Adorno-Platz 1, 60629 Frankfurt am Main, Germany

Conveners

Parallel session 22: Initial state of hadronic and electron-ion collisions & nuclear structure II

• Kari J. Eskola (University of Jyväskylä (FI))

954. New constraints on nPDFs using dijets in pPb collisions at 8.16 TeV with CMS

Austin Alan Baty (University of Illinois Chicago)

08/04/2025, 16:10

Initial state of hadronic and electron-ion collisions & nuclear structure

Oral

Measurements of dijet production in heavy ion collisions can be used to probe the nuclear matter. In proton-lead collisions, the normalized average dijet pseudorapidity distributions can be used as a sensitive tool for constraining the nuclear modifications of parton distribution functions (nPDF) at different $Q^2$ scales and Bjorken-$x$. In such studies, it is possible to investigate, with a...

952. Multiparticle Cumulants up to 8th Order to Constrain the Initial State in Xe-Xe and Pb-Pb Collisions in the CMS Experiment

Aryaa Dattamunsi (Indian Institute of Technology Madras (IN))

08/04/2025, 16:30

Initial state of hadronic and electron-ion collisions & nuclear structure

Oral

Xenon (Xe) nuclei are deformed and have a non-zero quadrupole moment, whereas lead (Pb) nuclei are considered spherical in shape. The study of Xe-Xe collisions at a center-of-mass energy per nucleon pair of $\sqrt{s_{_{\mathrm{NN}}}} = 5.44$ TeV opens up a window to study nuclear deformation at LHC. When compared to Pb-Pb collisions at $\sqrt{s_{_{\mathrm{NN}}}} = 5.36$ TeV, one can explore...

912. Imaging shapes of atomic nuclei in high-energy nuclear collisions at STAR experiment

Chunjian Zhang (Fudan University)

08/04/2025, 16:50

Initial state of hadronic and electron-ion collisions & nuclear structure

Oral

The shape and orientation of colliding nuclei play a crucial role in determining the initial conditions of the QGP formed in central collisions, which influence key observables such as anisotropic and radial flow. For instance, central collisions of near-spherical Au nuclei create a QGP with a fixed, circular geometry, whereas prolate-shaped uranium nuclei can collide in a variety of...

653. A global analysis of the shapes of Xe-129 and Pb-208 at the Large Hadron Collider

Dr Wilke Van Der Schee (CERN)

08/04/2025, 17:10

Initial state of hadronic and electron-ion collisions & nuclear structure

Oral

The six-hour Xe-129 run at the LHC has produced a remarkable wealth of physics, among which several studies of its nuclear shape. Previous works indicate that the elliptic flow ratio with Pb-208 collisions determines the quadrupole deformation ($\beta_2$) of Xe, while the $\rho_2$ elliptic flow-mean $p_T$ correlator informs us about the so-called triaxiality ($\gamma$). In this work, we go one...

570. Effects of sub-nucleonic fluctuations on the longitudinal structure of heavy-ion collisions

Oscar Jesús Garcia Montero

08/04/2025, 17:30

Initial state of hadronic and electron-ion collisions & nuclear structure

Oral

Subnuclear fluctuations in the initial state of heavy-ion collisions impact not only transverse long-range correlations of small systems, but also the creation of longitudinal structures, measured in longitudinal decorrelation observables [1]. In this work, we study the emergence of long-range rapidity correlations in nuclear collisions due to the inclusion of event-by-event subnuclear...

546. A new perspective on nuclear SIDIS and Drell-Yan data from dynamical TMD effects analysis

Prof. Weiyao Ke (Central China Normal University)

08/04/2025, 17:50

Initial state of hadronic and electron-ion collisions & nuclear structure

Oral

The semi-inclusive deep inelastic scattering (SIDIS) and Drell-Yan (DY) processes are primary channels for studying the parton distributions of the proton and the nucleus, and for deducing the properties of cold nuclear matter. However, for nuclear targets, the DY and SIDIS differential cross-sections are modified by multiple interactions between the active parton and spectator nucleons, which...

219. Imaging event-by-event nuclear shapes in relativistic nuclear collisions

Chun Shen (Wayne State University)

08/04/2025, 18:10

Initial state of hadronic and electron-ion collisions & nuclear structure

Oral

The event-by-event shapes of colliding nuclei are imprinted on flow patterns measured in relativistic heavy-ion collisions because of the strong hydrodynamic response to collision geometry. In this work, we perform high-statistics simulations to study the impacts of nuclear structure on the ratios of anisotropic flow observables between different collision systems. We study...