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Measurement of the jet mass in high transverse momentum Z(→bb)γ production at √s=13 TeV using the ATLAS detector

Collaboration, ATLAS; (2021) Measurement of the jet mass in high transverse momentum Z(→bb)γ production at √s=13 TeV using the ATLAS detector. Physics Letters B , 812 , Article 135991. 10.1016/j.physletb.2020.135991. Green open access

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Abstract

The integrated fiducial cross-section and unfolded differential jet mass spectrum of high transverse momentum Z → bb decays are measured in Zγ events in proton–proton collisions at √s = 13 TeV. The data analysed were collected between 2015 and 2016 with the ATLAS detector at the Large Hadron Collider and correspond to an integrated luminosity of 36.1 fb−1. Photons are required to have a transverse momentum pT > 175 GeV. The Z → bb decay is reconstructed using a jet with pT > 200 GeV, found with the anti-kt R = 1.0 jet algorithm, and groomed to remove soft and wideangle radiation and to mitigate contributions from the underlying event and additional proton–proton collisions. Two different but related measurements are performed using two jet grooming definitions for reconstructing the Z → bb decay: trimming and soft drop. These algorithms differ in their experimental and phenomenological implications regarding jet mass reconstruction and theoretical precision. To identify Z bosons, b-tagged R = 0.2 track-jets matched to the groomed large-R calorimeter jet are used as a proxy for the b-quarks. The signal yield is determined from fits of the data-driven background templates to the different jet mass distributions for the two grooming methods. Integrated fiducial cross-sections and unfolded jet mass spectra for each grooming method are compared with leading-order theoretical predictions. The results are found to be in good agreement with Standard Model expectations within the current statistical and systematic uncertainties.

Type: Article
Title: Measurement of the jet mass in high transverse momentum Z(→bb)γ production at √s=13 TeV using the ATLAS detector
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.physletb.2020.135991
Publisher version: https://doi.org/10.1016/j.physletb.2020.135991
Language: English
Additional information: © 2020 The Author. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP3.
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/10117758
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