XXVIII International Workshop on Deep-Inelastic Scattering and Related Subjects

Light meson nuclear modification factor in p-Pb collisions over an unprecedented 𝑝T range with ALICE

14 Apr 2021, 08:36

18m

Virtual (Stony Brook, NY)

Contributed Talk QCD with Heavy Flavors and Hadronic Final States QCD with Heavy Flavors and Hadronic Final States

Speaker

Joshua Koenig (IKF, Universität Frankfurt)

Description

Light meson measurements in high-energy proton-nucleus collisions provide a probe to study the physics of strongly interacting matter and the quark-gluon plasma. In particular, measuring the nuclear modification factor, where the particle production in p-A is compared to a baseline proton-proton reference which is scaled to account for nuclear geometry, provides important insight to the modification of nucleon structure functions in nuclei and a baseline for the observed strong suppression of hadron yields at high $p_{\mathrm{T}}$ in heavy-ion collisions.

In this talk, neutral pion and $\eta$ meson invariant differential yields and nuclear modification factors at mid-rapidity are presented with a $p_{\mathrm{T}}$ reach beyond 100 GeV/$c$ and up to $40$ GeV/$c$, respectively, and compared to theoretical model calculations. Both neutral mesons are measured via their diphoton decay channel in pp and p-Pb collisions at $\sqrt{s_{\mathrm{N}\mathrm{N}}}=5.02$ and $8.16$ TeV with the ALICE experiment at the CERN LHC. The analysis combines results from several partially independent reconstruction techniques where the decay photons were detected with the electromagnetic calorimeter, EMCal, the photon spectrometer, PHOS, or via reconstruction of $e^{+}{e}^{-}$ pairs from conversions in the ALICE detector material using the central tracking system.

Presentation materials

2021_04_14_DIS_Joshua_Koenig.pdf

Youtube Link