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

Aad, G.; Abbott, B.; Adomeit, Stefanie; Becker, S. und Biebel, Otmar (2016): Measurement of the charged-particle multiplicity inside jets from root s=8 TeV pp collisions with the ATLAS detector. In: European Physical Journal C, Vol. 76, No. 6, 322

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(T) > 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 root 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.

• Item Type: Journal article
• Faculties: Physics
• Subjects: 500 Science > 530 Physics
• ISSN: 1434-6044
• Annotation: ATLAS Collaboration: weitere AutorInnen siehe PDF
• Language: English