Measurement of the jet mass in high transverse momentum Z(-> b(b)over-bar)gamma production at root s=13 TeV using the ATLAS detector Aad, G. Aguilar Saavedra, Juan Antonio Atlas Collaboration 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=13TeV. 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>175GeV. The Z→bbdecay is reconstructed using a jet with pT>200GeV, 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. 2021-03-10T12:17:06Z 2021-03-10T12:17:06Z 2020-12-03 info:eu-repo/semantics/article Aaboud, M., Asimakopoulou, E. M., Bergeås Kuutmann, E., Bokan, P., Brenner, R., Ekelöf, T., ... & Sales De Bruin, P. (2021). Measurement of the jet mass in high transverse momentum Z (-> b (b) over-bar) gamma production at root s= 13 TeV using the ATLAS detector. Physics Letters B, 812. [https://doi.org/10.1016/j.physletb.2020.135991] http://hdl.handle.net/10481/67060 10.1016/j.physletb.2020.135991 eng http://creativecommons.org/licenses/by/3.0/es/ info:eu-repo/semantics/openAccess Atribución 3.0 España Elsevier