Measurement of the c-jet mistagging efficiency in tt¯ events using pp collision data at √s = 13 TeV collected with the ATLAS detector

0561681 - FZÚ 2023 RIV DE eng J - Journal Article
Aad, G. - Abbott, B. - Abbott, D.C. - Chudoba, Jiří - Hejbal, Jiří - Hladík, Ondřej - Jačka, Petr - Kepka, Oldřich - Kroll, Jiří - Kupčo, Alexander - Latoňová, Věra - Lokajíček, Miloš - Lysák, Roman - Marčišovský, Michal - Mikeštíková, Marcela - Němeček, Stanislav - Penc, Ondřej - Šícho, Petr - Staroba, Pavel - Svatoš, Michal - Taševský, Marek … Total 2900 authors
Measurement of the c-jet mistagging efficiency in tt¯ events using pp collision data at √s = 13 TeV collected with the ATLAS detector.
European Physical Journal C. Roč. 82, č. 1 (2022), č. článku 95. ISSN 1434-6044. E-ISSN 1434-6052
Research Infrastructure: CERN-CZ II - 90104; e-INFRA CZ - 90140
Institutional support: RVO:68378271
Keywords : ATLAS * CERN LHC Coll * particle identification: efficiency
OECD category: Particles and field physics
Impact factor: 4.4, year: 2022
Method of publishing: Open access

A technique is presented to measure the efficiency with which c-jets are mistagged as b-jets (mistagging efficiency) using ttˉttˉ events, where one of the W bosons decays into an electron or muon and a neutrino and the other decays into a quark–antiquark pair. The measurement utilises the relatively large and known W→csW→cs branching ratio, which allows a measurement to be made in an inclusive c-jet sample. The data sample used was collected by the ATLAS detector at s=13s ​=13 TeVTeV and corresponds to an integrated luminosity of 139 fb−1−1. Events are reconstructed using a kinematic likelihood technique which selects the mapping between jets and ttˉttˉ decay products that yields the highest likelihood value. The distribution of the b-tagging discriminant for jets from the hadronic W decays in data is compared with that in simulation to extract the mistagging efficiency as a function of jet transverse momentum.
Permanent Link: https://hdl.handle.net/11104/0337245