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 >500pT> 500 \mathrmMeV MeV Â inside high-momentum jets in dijet events using 20.3 fb-1of data recorded with the ATLAS detector in pp collisions at âs = 8 TeV Â collisions at the LHC. The jets considered have transverse momenta from 50Â GeV Â 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.
Measurement of the charged-particle multiplicity inside jets from sqrt s = 8 TeV pp collisions with the ATLAS detector
Conventi, F.;Di Donato, C.;Rossi, E.;
2016-01-01
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 >500pT> 500 \mathrmMeV MeV Â inside high-momentum jets in dijet events using 20.3 fb-1of data recorded with the ATLAS detector in pp collisions at âs = 8 TeV Â collisions at the LHC. The jets considered have transverse momenta from 50Â GeV Â 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.