Электронный каталог

Статья

Chekhovsky, V.
Search for Jet Quenching with Dijets from High-Multiplicity pPb Collisions at *%s&sub(NN)=8.16 TeV / V.Chekhovsky, S.Afanasiev, V.Alexakhin, D.Budkouski, I.Golutvin, I.Gorbunov, V.Karjavine, O.Kodolova, V.Korenkov, A.Lanev, A.Malakhov, V.Matveev, A.Nikitenko, V.Palichik, S.Polikarpov, M.Savina, V.Shalaev, S.Shmatov, S.Shulha, V.Smirnov, O.Teryaev, N.Voytishin, B.S.Yuldashev, A.Zarubin, I.Zhizhin, N.Krasnikov, [CMS Collab.]. – Text : electronic // Journal of High Energy Physics. – 2025. – Vol. 2025, No. 7. – P. 118. – URL: https://doi.org/10.1007/JHEP07(2025)118. – Bibliogr.: 48.

The first measurement of the dijet transverse momentum balance xj in proton-lead (pPb) collisions at a nucleon-nucleon center-of-mass energy of *%s&sub(NN) = 8.16 TeV is presented. The x&sub(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&sub(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 xj 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.



ОИЯИ = ОИЯИ (JINR)2025