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DOI: 10.5445/IR/1000072964

Measurement of the jet mass in highly boosted $t\overline{t}$ events from pp collisions at √s=8TeV

CMS Collaboration; Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Asilar, E.; Bergauer, T.; Brandstetter, J.; Brondolin, E.; Dragicevic, M.; Erö, J.; Flechl, M.; Friedl, M.; Frühwirth, R.; Ghete, V. M.; Hartl, C.; Hörmann, N.; Hrubec, J.; Jeitler, M.; König, A.; Krätschmer, I.; Liko, D.; ... mehr

Abstract:
The first measurement of the jet mass m jet of top quark jets produced in tt ¯ events from pp collisions at s √s =8 TeV is reported for the jet with the largest transverse momentum p T in highly boosted hadronic top quark decays. The data sample, collected with the CMS detector, corresponds to an integrated luminosity of 19.7fb −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 tt ¯ events with large Lorentz boosts. The products of the fully hadronic decay t→bW with W→qq ¯′ are reconstructed using a single Cambridge–Aachen jet with distance parameter R=1.2 and p T >400 GeV. The tt ¯ cross section as a function of m 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 jet distribution is sensitive to the top quark mass m t
mt, and the data are used to extract a value of m t to assess this sensitivity.


Zugehörige Institution(en) am KIT Institut für Experimentelle Kernphysik (IEKP)
Publikationstyp Zeitschriftenaufsatz
Jahr 2017
Sprache Englisch
Identifikator ISSN: 1434-6044, 1434-6052
URN: urn:nbn:de:swb:90-729646
KITopen ID: 1000072964
Erschienen in The European physical journal / C
Band 77
Heft 7
Seiten Art. Nr. 467
Bemerkung zur Veröffentlichung Gefördert durch SCOAP3
Schlagworte CMS, Physics, Top quark cross section, Top quark mass
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