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|Title:||Measurement of the jet mass in high transverse momentum Z(→bb‾)γ production at √s=13TeV using the ATLAS detector|
|Other Titles:||Measurement of the jet mass in high transverse momentum Z(-> bb -bar)gamma production at root s=13TeV using the ATLAS detector|
Abed Abud, A.
Adam Bourdarios, C.
|Citation:||Physics Letters B: Nuclear Physics and Particle Physics, 2021; 812:135991-135991|
|G. Aad, B. Abbott, D.C. Abbott … Paul Jackson … Martin White … Harish Potti ... et al.|
|Abstract:||The integrated fiducial cross-section and unfolded differential jet mass spectrum of high transverse momentum Z→bbdecays are measured in Zγevents 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 36.1fb−1. Photons are required to have a transverse momentum pT>175 GeV. The Z→bbdecay is reconstructed using a jet with pT>200 GeV, found with the anti-ktR =1.0jet algorithm, and groomed to remove soft and wide-angle 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→bbdecay: trimming and soft drop. These algorithms differ in their experimental and phenomenological implications regarding jet mass reconstruction and theoretical precision. To identify Zbosons, b-tagged R =0.2track-jets matched to the groomed large-Rcalorimeter 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.|
|Rights:||© 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|
|Appears in Collections:||Aurora harvest 8|
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