Measurement of masses in the t t-bar system by kinematic endpoints in pp collisions at sqrt(s) = 7 TeV
(2013) European Physical Journal C. Particles and Fields — Vol. C73, p. 2494 (2013)
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- 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.
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Citations
CMS Collaboration, Basegmez, S., Bruno, G., Castello, R., Caudron, A., Ceard, L., Delaere, C., Du Pree, T., Favart, D., Forthomme, L., Hollar, J., Lemaitre, V., Liao, J., Militaru, O., Nuttens, C., Pagano, D., Pin, A., Piotrzkowski, K., Selvaggi, M., et al. (2013). 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, C73, 2494. https://doi.org/10.1140/epjc/s10052-013-2494-7 (Original work published 2013)