Measurement of the charged-particle multiplicity inside jets from √s=8 TeV pp collisions with the ATLAS detector

0470115 - FZÚ 2017 RIV DE eng J - Journal Article
Aaboud, M. - Aad, G. - Abbott, B. - Chudoba, Jiří - Havránek, Miroslav - Hejbal, Jiří - Jakoubek, Tomáš - Kepka, Oldřich - Kupčo, Alexander - Kůs, Vlastimil - Lokajíček, Miloš - Lysák, Roman - Marčišovský, Michal - Mikeštíková, Marcela - Němeček, Stanislav - Penc, Ondřej - Šícho, Petr - Staroba, Pavel - Svatoš, Michal - Taševský, Marek - Vrba, Václav … Total 2868 authors
Measurement of the charged-particle multiplicity inside jets from √s=8 TeV pp collisions with the ATLAS detector.
European Physical Journal C. Roč. 76, č. 6 (2016), s. 1-35, č. článku 322. ISSN 1434-6044. E-ISSN 1434-6052
Institutional support: RVO:68378271
Keywords : ATLAS * CERN LHC Coll * nonperturbative * fragmentation * parton * dijet * experimental results * 8000 GeV-cms
Subject RIV: BF - Elementary Particles and High Energy Physics
Impact factor: 5.297, year: 2016

The number of charged particles inside jets is a widely used discriminant for identifying the quark or gluon nature of the initiating parton and is sensitive to both the perturbative and non-perturbative components of fragmentation. This paper presents a measurement of the average number of charged particles with pT>500 MeV inside high-momentum jets in dijet events using 20.3 fb−1 of data recorded with the ATLAS detector in pp collisions at s√=8 TeV collisions at the LHC. The jets considered have transverse momenta from 50 GeV up to and beyond 1.5 TeV . The reconstructed charged-particle track multiplicity distribution is unfolded to remove distortions from detector effects and the resulting charged-particle multiplicity is compared to several models. Furthermore, quark and gluon jet fractions are used to extract the average charged-particle multiplicity for quark and gluon jets separately.

Permanent Link: http://hdl.handle.net/11104/0267881