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Measurement of masses in the t t-bar system by kinematic endpoints in pp collisions at sqrt(s)=7 TeV

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.) +1.6/-2.0 (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.
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http://hal.in2p3.fr/in2p3-00816800
Contributor : Sylvie Flores <>
Submitted on : Tuesday, April 23, 2013 - 7:32:59 AM
Last modification on : Wednesday, November 25, 2020 - 4:10:43 PM

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S. Chatrchyan, M. Besançon, S. Choudhury, F. Couderc, M. Dejardin, et al.. Measurement of masses in the t t-bar system by kinematic endpoints in pp collisions at sqrt(s)=7 TeV. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2013, 73, pp.2494. ⟨10.1140/epjc/s10052-013-2494-7⟩. ⟨in2p3-00816800⟩

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