Search for jet quenching with dijets from high-multiplicity pPb collisions at $$sqrt{{s}_{text{NN}}}$$ = 8.16 TeV Journal Article uri icon

Overview

abstract

  • Abstract; ; The first measurement of the dijet transverse momentum balance x; ; j; in proton-lead (pPb) collisions at a nucleon-nucleon center-of-mass energy of ; $$sqrt{{s}_{text{NN}}}$$; = 8.16 TeV is presented. The x; ; j; observable, defined as the ratio of the subleading over leading jet transverse momentum in a dijet pair, is used to search for jet quenching effects. The data, corresponding to an integrated luminosity of 174.6 nb; −1, were collected with the CMS detector in 2016. The x; ; j; distributions and their average values are studied as functions of the charged-particle multiplicity of the events and for various dijet rapidity selections. The latter enables probing hard scattering of partons carrying distinct nucleon momentum fractions x in the proton- and lead-going directions. The former, aided by the high-multiplicity triggers, allows probing for potential jet quenching effects in high-multiplicity events (with up to 400 charged particles), for which collective phenomena consistent with quark-gluon plasma (QGP) droplet formation were previously observed. The ratios of x; ; j; distributions for high- to low-multiplicity events are used to quantify the possible medium effects. These ratios are consistent with simulations of the hard-scattering process that do not include QGP production. These measurements set an upper limit on medium-induced energy loss of the subleading jet of 1.26% of its transverse momentum at the 90% confidence level in high multiplicity pPb events.

publication date

  • July 9, 2025

Date in CU Experts

  • July 23, 2025 12:20 PM

Full Author List

  • Chekhovsky V; Hayrapetyan A; Makarenko V; Tumasyan A; Adam W; Andrejkovic JW; Benato L; Bergauer T; Damanakis K; Dragicevic M

author count

  • 2383

Other Profiles

Electronic International Standard Serial Number (EISSN)

  • 1029-8479

Additional Document Info

volume

  • 2025

issue

  • 7

number

  • 118