CMS-TOP-19-005
Measurement of the jet mass distribution and top quark mass in hadronic decays of boosted top quarks in pp collisions at √s= 13 TeV
A measurement is reported of the jet mass distribution in hadronic decays of boosted top quarks produced in pp collisions at √s= 13 TeV. The data were collected with the CMS detector at the LHC and correspond to an integrated luminosity of 35.9 fb−1. The measurement is performed in the lepton+jets channel of tt events, where the lepton is an electron or muon. The products of the hadronic top quark decay t→bW→bqq′ are reconstructed as a single jet with transverse momentum larger than 400 GeV. The tt cross section as a function of the jet mass is unfolded at the particle level and used to extract a value of the top quark mass of 172.6 ± 2.5 GeV. A novel jet reconstruction technique is used for the first time at the LHC, which improves the precision by a factor of three relative to an earlier measurement.
XCone: arXiv:1508.01516 (2015), Iain Stewart et al.