The European Physical Journal C > 2016 > 76 > 6 > 1-23
Measurement of the charged-particle multiplicity inside jets from $$\sqrt{s}=8$$ s = 8 $${\mathrm{TeV}}$$ TeV pp collisions with the ATLAS detector
Source
Abstract
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 $$p_\text {T}>500$$ p T > 500 $${\mathrm{MeV}}$$ MeV inside high-momentum jets in dijet events using 20.3 fb $$^{-1}$$ - 1 of data recorded with the ATLAS detector in pp collisions at $$\sqrt{s}=8$$ s = 8 $${\mathrm{TeV}}$$ TeV collisions at the LHC. The jets considered have transverse momenta from 50 $${\mathrm{GeV}}$$ GeV up to and beyond 1.5 $${\mathrm{TeV}}$$ 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.
Identifiers
journal ISSN : | 1434-6044 |
journal e-ISSN : | 1434-6052 |
DOI | 10.1140/epjc/s10052-016-4126-5 |