A simultaneous measurement of the top-quark, W-boson, and neutrino masses is reported for tt̄ events selected in the dilepton final state from a data sample corresponding to an integrated luminosity of 5.0 fb-1 collected by the CMS experiment in pp collisions at √s = 7 TeV. The analysis is based on endpoint determinations in kinematic distributions. When the neutrino and W-boson masses are constrained to their world-average values, a top-quark mass value of Mt = 173.9 ± 0.9 (stat)+1.7 -2.1(syst.) GeV is obtained. When such constraints are not used, the three particle masses are obtained in a simultaneous fit. In this unconstrained mode the study serves as a test of mass determination methods that may be used in beyond standard model physics scenarios where several masses in a decay chain may be unknown and undetected particles lead to underconstrained kinematics.

Chatrchyan, S., Khachatryan, V., Sirunyan, A., Tumasyan, A., Adam, W., Bergauer, T., et al. (2013). Measurement of masses in the tt̄ system by kinematic endpoints in pp collisions at √s = 7 TeV. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 73(7), 1-28 [10.1140/epjc/s10052-013-2494-7].

Measurement of masses in the tt̄ system by kinematic endpoints in pp collisions at √s = 7 TeV

Benaglia A.;De Guio F.;Di Matteo L.;Fiorendi S.;Ghezzi A.;Govoni P.;Lucchini M. T.;Manzoni R. A.;Martelli A.;Massironi A.;Moroni L.;Paganoni M.;Ragazzi S.;Tabarelli de Fatis T.;Branca A.;Malberti M.;Dinardo M. E.;
2013

Abstract

A simultaneous measurement of the top-quark, W-boson, and neutrino masses is reported for tt̄ events selected in the dilepton final state from a data sample corresponding to an integrated luminosity of 5.0 fb-1 collected by the CMS experiment in pp collisions at √s = 7 TeV. The analysis is based on endpoint determinations in kinematic distributions. When the neutrino and W-boson masses are constrained to their world-average values, a top-quark mass value of Mt = 173.9 ± 0.9 (stat)+1.7 -2.1(syst.) GeV is obtained. When such constraints are not used, the three particle masses are obtained in a simultaneous fit. In this unconstrained mode the study serves as a test of mass determination methods that may be used in beyond standard model physics scenarios where several masses in a decay chain may be unknown and undetected particles lead to underconstrained kinematics.
Articolo in rivista - Articolo scientifico
high energy collider; LHC; CMS; top quark
English
2013
73
7
1
28
2494
none
Chatrchyan, S., Khachatryan, V., Sirunyan, A., Tumasyan, A., Adam, W., Bergauer, T., et al. (2013). Measurement of masses in the tt̄ system by kinematic endpoints in pp collisions at √s = 7 TeV. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 73(7), 1-28 [10.1140/epjc/s10052-013-2494-7].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/46147
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