Abstract
A measurement is reported of the jet mass distribution in hadronic decays of boosted top quarks produced in pp collisions at sqrt[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[over ¯] events, where the lepton is an electron or muon. The products of the hadronic top quark decay t→bW→bqq[over ¯]^{'} are reconstructed as a single jet with transverse momentum larger than 400GeV. The tt[over ¯] 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 3 relative to an earlier measurement. This highlights the potential of measurements using boosted top quarks, where the new technique will enable future precision measurements.
Highlights
The jet mass distribution in hadronic decays 13 TeV
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 Æ 2.5 GeV
This highlights the potential of measurements using boosted top quarks, where the new technique will enable future precision measurements
Summary
(Received 9 November 2019; revised manuscript received 25 March 2020; accepted 1 May 2020; published 21 May 2020). 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 Æ 2.5 GeV. Simulated events are processed through the software chain used for collision data and are reweighted to match the observed distribution in the number of pileup interactions in the data This analysis uses data recorded with the CMS detector that correspond to an integrated luminosity of 35.9 fb−1 [58]. Events containing the decay of a top quark to a final state including a muon are selected using a single-muon trigger [59] that requires the presence of at least one muon candidate with a transverse momentum pT > 50 GeV and jηj < 2.4.
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