QCD@LHC 2026

Session

Low-scale QCD, including heavy-ion physics

28 Sept 2026, 14:00

University of Oxford

78. Beam-spin induced polarization of lambda and anti-lambda hyperons in semi-inclusive deep-inelastic scattering

HERMES Collaboration

Low-scale QCD, including heavy-ion physics

Standard slot

The beam-spin induced polarization of $\Lambda$ and $\bar{\Lambda}$ hyperons produced in deep-inelastic scattering of longitudinally polarized positrons from unpolarized nucleons has been investigated by the HERMES experiment at a positron beam energy of 27.6 GeV impinging on hydrogen, deuterium, and various heavier gas targets. The two spin-transfer coefficients $D_{LX}$ and $D_{LZ}$ are...

64. Collective flow measurements in OO and NeNe collisions with CMS

Jiateng Peng (Fudan University)

Low-scale QCD, including heavy-ion physics

Standard slot

Measurements of collective flow in intermediate-size collision systems such as OO and NeNe are crucial for understanding the origin of collectivity in small systems and its evolution with collision system size. Using data collected by the CMS experiment at the LHC, flow coefficients of charged particles ($n=2,3$) are measured in OO and NeNe collisions using two- and multi-particle correlation...

30. How to actually measure jet quenching in heavy-ion collisions

Peter Martin Jacobs (Lawrence Berkeley National Lab. (US))

Low-scale QCD, including heavy-ion physics

Standard slot

The scattering of a well-controlled probe particle is a time-honored method to explore the structure and dynamics of matter. In heavy-ion collisions, the interaction of jets with the Quark-Gluon Plasma (“jet quenching”) promises such a probe. However, well-controlled jet reconstruction in the complex environment of nuclear collisions is extraordinarily difficult – the thousands of particles...

71. Jet production in photon-lead collisions at NLO+PS accuracy

Peter Meinzinger (Zürich University)

Low-scale QCD, including heavy-ion physics

Standard slot

Ultraperipheral Pb+Pb collisions at the LHC produce quasi-real photons reaching high energies, making photonuclear jet production a probe of the partonic structure of both the nucleus and the photon. We present NLO+PS predictions for photonuclear jet production matched to the observables of the ATLAS UPC Pb+Pb measurement at sqrt(s_NN) = 5.02 TeV. This provides the parton-shower-matched...

63. Measurement of hyperon spin correlation in pp and pPb collisions at CMS

Jieke Wang (Shandong University (CN))

Low-scale QCD, including heavy-ion physics

Standard slot

Spin correlations between hyperons provide a novel probe of spin-dependent particle production and hadronization in quantum chromodynamics (QCD). Using the high-statistics data collected by the CMS experiment, we present the first measurements of spin correlations for $\Lambda\Lambda$, $\Lambda\bar{\Lambda}$, and $\bar{\Lambda}\bar{\Lambda}$ pairs in pp collisions at $\sqrt{s}=13$ TeV and pPb...

116. Measurement of the jet quenching effect with Z+jet events in PbPb and pp collisions at 5.36 TeV with Run 3 data

Bhawna Gomber (University of Hyderabad, India)

Low-scale QCD, including heavy-ion physics

Standard slot

The production of jets in association with Z bosons offers a uniquely clean probe of the quark-gluon plasma (QGP), as the Z boson's decay products bypass strong medium interactions, preserving the initial hard-scattering kinematics. We present the latest measurement of Z+jet correlations in the dimuon channel using the new 5.36 TeV Run 3 data collected by the CMS experiment in 2023 and 2024....

44. Minibias measurements with pO collisions in ATLAS

ATLAS Collaboration

Low-scale QCD, including heavy-ion physics

Standard slot

The utilisation of pO collision events at the LHC offers complementary means to test QCD predictions, and in particular provides sensitive probes to hadronic models that connect with cosmic-ray physics. This talk presents the minibias measurements with pO collusions from the ATLAS experiment.

47. Soft QCD measurements with pp collisions in ATLAS

ATLAS Collaboration

Low-scale QCD, including heavy-ion physics

Standard slot

Measurement of soft QCD and DPI-related processes offer insights to understand QCD phenomena at small energy scales and non-perturbative regime, probe mechanisms for multi-parton interactions, and search for undiscovered phenomena such as QCD instantons. This talk presents the relevant results in this sector from the ATLAS experiments

122. System-size dependence of charged-particle production at mid and forward pseudorapidity with ALICE

Gyula Bencedi (HUN-REN Wigner Research Centre for Physics (HU))

Low-scale QCD, including heavy-ion physics

Standard slot

The pseudorapidity dependence of charged-particle production provides information on the interplay between hard and soft QCD processes and is sensitive to non-linear QCD evolution in the initial state. For the LHC Run 3, ALICE has upgraded its detectors, increasing its pseudorapidity coverage and improving tracking of charged particles. This is done by combining the information from the...

80. Using low-pt dimuon events to measure transverse proton structure

Kyle Cormier (University of Zurich (CH))

Low-scale QCD, including heavy-ion physics

Standard slot

We present new methods for measuring the transverse structure of the proton, relying on ratios of event activity variables between events with a low-pt pair of muons and minimum bias events. The event activity is used in a similar way to centrality in heavy ion physics, and the evolution of the hard-process cross section provides information on the effective partonic luminosity as a function...