A simultaneous measurement of the top-quark, W-boson, and neutrino masses is reported for t t-bar events selected in the dilepton final state from a data sample corresponding to an integrated luminosity of 5.0 inverse femtobarns collected by the CMS experiment in pp collisions at sqrt(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 M[t] = 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 $mathrm{t}overline{mathrm{t}}$ system by kinematic endpoints in pp collisions at $sqrt{s}=7 mathrm{TeV}$. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 73(7), 1-28 [10.1140/epjc/s10052-013-2494-7].

Measurement of masses in the $mathrm{t}overline{mathrm{t}}$ system by kinematic endpoints in pp collisions at $sqrt{s}=7 mathrm{TeV}$

BENAGLIA, ANDREA DAVIDE;DE GUIO, FEDERICO;DI MATTEO, LEONARDO;FIORENDI, SARA;GHEZZI, ALESSIO;GOVONI, PIETRO;LUCCHINI, MARCO TOLIMAN;MANZONI, RICCARDO ANDREA;MARTELLI, ARABELLA;MASSIRONI, ANDREA;MORONI, LUIGI;PAGANONI, MARCO;RAGAZZI, STEFANO;TABARELLI DE FATIS, TOMMASO;Branca, A;DINARDO, MAURO EMANUELE;
2013

Abstract

A simultaneous measurement of the top-quark, W-boson, and neutrino masses is reported for t t-bar events selected in the dilepton final state from a data sample corresponding to an integrated luminosity of 5.0 inverse femtobarns collected by the CMS experiment in pp collisions at sqrt(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 M[t] = 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
1
28
28
The CMS collaboration
Chatrchyan, S., Khachatryan, V., Sirunyan, A., Tumasyan, A., Adam, W., Bergauer, T., et al. (2013). Measurement of masses in the $mathrm{t}overline{mathrm{t}}$ system by kinematic endpoints in pp collisions at $sqrt{s}=7 mathrm{TeV}$. 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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