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

Research output: Contribution to journalJournal article

  • The ATLAS collaboration
Article number322
<mark>Journal publication date</mark>13/06/2016
<mark>Journal</mark>European Physical Journal C: Particles and Fields
Issue number6
Number of pages23
Publication statusPublished
Original languageEnglish


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>500MeV inside high-momentum jets in dijet events using 20.3 fb−1−1 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.