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

CMS Collaboration

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Abstract

A simultaneous measurement of the top-quark, W-boson, and neutrino masses is reported for tt‾ 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.
Original languageEnglish
Article number2494
Number of pages28
JournalEuropean Physical Journal C
Volume73
Issue number7
DOIs
Publication statusPublished - 2013
Externally publishedYes

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