Properties of jet fragmentation using charged particles measured with the ATLAS detector in pp collisions at √s=13  TeV

Franconi, Laura; Miucci, Antonio; Merlassino, Claudia; Haug, Sigve; Weber, Michael; Anders, John Kenneth; Beck, Hans Peter; Ereditato, Antonio; Weston, Thomas Daniel (2019). Properties of jet fragmentation using charged particles measured with the ATLAS detector in pp collisions at √s=13  TeV. Physical review. D - particles, fields, gravitation, and cosmology, 100(5) American Physical Society 10.1103/PhysRevD.100.052011

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This paper presents a measurement of quantities related to the formation of jets from high-energy quarks and gluons (fragmentation). Jets with transverse momentum 100 GeV <pT<2.5  TeV and pseudorapidity |η|<2.1 from an integrated luminosity of 33  fb−1 of √s=13  TeV proton-proton collisions are reconstructed with the ATLAS detector at the Large Hadron Collider. Charged-particle tracks with pT>500  MeV and |η|<2.5 are used to probe the detailed structure of the jet. The fragmentation properties of the more forward and the more central of the two leading jets from each event are studied. The data are unfolded to correct for detector resolution and acceptance effects. Comparisons with parton shower Monte Carlo generators indicate that existing models provide a reasonable description of the data across a wide range of phase space, but there are also significant differences. Furthermore, the data are interpreted in the context of quark- and gluon-initiated jets by exploiting the rapidity dependence of the jet flavor fraction. A first measurement of the charged-particle multiplicity using model-independent jet labels (topic modeling) provides a promising alternative to traditional quark and gluon extractions using input from simulation. The simulations provide a reasonable description of the quark-like data across the jet pT range presented in -this measurement, but the gluon-like data have systematically fewer charged particles than the simulation.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)
08 Faculty of Science > Physics Institute > Laboratory for High Energy Physics (LHEP)

UniBE Contributor:

Franconi, Laura; Miucci, Antonio; Merlassino, Claudia; Haug, Sigve; Weber, Michael; Anders, John Kenneth; Beck, Hans Peter; Ereditato, Antonio and Weston, Thomas Daniel

Subjects:

500 Science > 530 Physics

ISSN:

1550-7998

Publisher:

American Physical Society

Language:

English

Submitter:

BORIS Import LHEP

Date Deposited:

12 Jun 2020 10:58

Last Modified:

14 Jun 2020 02:52

Publisher DOI:

10.1103/PhysRevD.100.052011

Additional Information:

Kollaboration - Es sind nur die Berner AutorInnen namentlich erwaehnt; The ATLAS Collaboration

BORIS DOI:

10.7892/boris.143569

URI:

https://boris.unibe.ch/id/eprint/143569

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