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Measurement of the jet mass in high transverse momentum $Z(\\rightarrow b\\overline{b})\\gamma$ production at $\\sqrt{s}= 13$ TeV using the ATLAS detector

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Le résumé fourni par la source

The integrated fiducial cross-section and unfolded differential jet mass spectrum of high transverse momentum $Z\rightarrow b\overline{b}$ decays are measured in $Zγ$ events in proton–proton collisions at $\sqrt{s}= 13$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 $p_T$>175GeV . The $Z\rightarrow b\overline{b}$ decay is reconstructed using a jet with $p_T$>200GeV , found with the anti-$k_t$ $R$=1.0 jet 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 $Z\rightarrow b\overline{b}$ 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.

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Les sujets associés

Particle physics theoretical and experimental studiesParticle Detector Development and PerformanceDistributed and Parallel Computing Systems

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