Электронный каталог

Статья

Aad, G.
Measurement of Substructure-Dependent Suppression of Large-Radius Jets with Charged Particles in Pb+Pb Collisions with ATLAS / G.Aad, F.Ahmadov, I.N.Aleksandrov, V.A.Bednyakov, I.R.Boyko, G.Chelkov, A.Cheplakov, M.V.Chizhov, D.V.Dedovich, M.Demichev, A.R.Didenko, M.I.Gostkin, S.N.Karpov, Z.M.Karpova, U.Kruchonak, V.Kukhtin, E.Ladygin, V.Lyubushkin, T.Lyubushkina, S.Malyukov, M.Mineev, E.Plotnikova, I.N.Potrap, N.A.Rusakovich, M.Shiyakova, A.Soloshenko, A.Tropina, P.V.Tsiareshka, T.Turtuvshin, A.Vasyukov, I.Yeletskikh, A.Zhemchugov, N.I.Zimine, [ATLAS Collab.]. – Text : electronic // Physics Letters B. – 2025. – Vol. 871. – P. 139929. – URL: https://doi.org/10.1016/j.physletb.2025.139929. – Bibliogr.: 65.

Measurements of jet substructure in Pb+Pb collisions provide key insights into the mechanism of jet quenching in the hot and dense QCD medium created in these collisions.This Letter presents a measurement of the suppression of large-radius jets with a radius parameter of 𝑅 = 1.0 and its dependence on the jet substructure. The measurement uses 1.72 nb&sup(−1) of Pb+Pb data and 255 pb&sup(−1) of 𝑝𝑝 data, both at *%𝑠&sub(NN) = 5.02 TeV, recorded with the ATLAS detector at the Large Hadron Collider. Large-radius jets are reconstructed by reclustering 𝑅 = 0.2 calorimetric jets and are measured for transverse momentum above 200 GeV. Jet substructure is evaluated using charged-particle tracks, and the overall level of jet suppression is quantified using the jet nuclear modification factor (𝑅&sub(AA)). The jet 𝑅&sub(AA) is measured as a function of jet 𝑝&sub(T) , the charged 𝑘&sub(𝑡) splitting scale (*%𝑑&sub(12)), and the angular separation (*D𝑅&sub(12)) of two leading sub-jets. The jet 𝑅&sub(AA) gradually decreases with increasing *% 𝑑&sub(12), implying significantly stronger suppression of large-radius jets with larger 𝑘&sub(𝑡) splitting scale. The jet 𝑅&sub(AA) gradually decreases for *D𝑅&sub(12) in the range 0.01−0.2 and then remains consistent with a constant for *D𝑅&sub(12) ≳ 0.2. The observed significant dependence of jet suppression on the jet substructure will provide new insights into its role in the quenching process.



Спец.(статьи,препринты) = С 343 е2 - Взаимодействие релятивистских ядер с ядрами
Спец.(статьи,препринты) = С 346 в - Адронные струи
ОИЯИ = ОИЯИ (JINR)2025