Measurement of masses in the t t-bar system by kinematic endpoints in pp collisions at sqrt(s)=7 TeV - IN2P3 - Institut national de physique nucléaire et de physique des particules Access content directly
Journal Articles European Physical Journal C: Particles and Fields Year : 2013

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

S. Chatrchyan
  • Function : Author
Pierre Busson
R. Granier de Cassagnac
C. Mironov
P. Paganini
J.-L. Agram
C. Collard
E. Conte
P. van Hove
D. Contardo
M. Gouzevitch
M. Lethuillier
V. Sordini
P. Verdier
S. Viret

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.

Dates and versions

in2p3-00816800 , version 1 (23-04-2013)

Identifiers

Cite

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, 2013, 73, pp.2494. ⟨10.1140/epjc/s10052-013-2494-7⟩. ⟨in2p3-00816800⟩
38 View
0 Download

Altmetric

Share

Gmail Facebook X LinkedIn More