Measurement of the jet mass in highly boosted t[bar over t] events from pp collisions at √s=8 TeV
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Author(s)
Abercrombie, Daniel Robert
Allen, Brandon Leigh
Apyan, Aram
Azzolini, Virginia
Barbieri, Richard Alexander
Baty, Austin Alan
Bi, Ran
Bierwagen, Katharina
Brandt, Stephanie Akemi
Busza, Wit
Date Issued
July 2017
Journal
The European Physical Journal C
Publisher
Springer/Società Italiana di Fisica
Citation
CMS Collaboration, et al. “Measurement of the Jet Mass in Highly Boosted t[bar over t] Events from Pp Collisions at √s = 8 TeV.” The European Physical Journal C, vol. 77, no. 7, July 2017.
Version
Final published version
Abstract
The first measurement of the jet mass mjet of top quark jets produced in tt¯ events from pp collisions at √s=8 TeV is reported for the jet with the largest transverse momentum pT in highly boosted hadronic top quark decays. The data sample, collected with the CMS detector, corresponds to an integrated luminosity of 19.7 fb[superscript -1]. The measurement is performed in the lepton+jets channel in which the products of the semileptonic decay t→bW with W→ℓν where ℓ is an electron or muon, are used to select t[bar over t] events with large Lorentz boosts. The products of the fully hadronic decay t→bW with W→q[bar overq]′ are reconstructed using a single Cambridge–Aachen jet with distance parameter R=1.2, and p[subscript T]>400 GeV . The t[bar over t] cross section as a function of m[subscript jet] is unfolded at the particle level and is used to test the modelling of highly boosted top quark production. The peak position of the m[subscript jet] distribution is sensitive to the top quark mass m[subscript t], and the data are used to extract a value of mt to assess this sensitivity. Keywords: CMS, Physics, Top quark cross section, Top quark mass
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1140/epjc/s10052-017-5030-3
