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

Chatrchyan, S. and Khachatryan, V. and Sirunyan, A. M. and Tumasyan, A. and Adam, W. and Bergauer, T. and Dragicevic, M. and Erö, J. and Fabjan, C. and Friedl, M. and Frühwirth, R. and Ghete, V. M. and Hörmann, N. and Hrubec, J. and Jeitler, M. and Kiesenhofer, W. and Knünz, V. and Krammer, M. and Krätschmer, I. and Liko, D. and Mikulec, I. and Rabady, D. and Rahbaran, B. and Rohringer, C. and Rohringer, H. and Schöfbeck, R. and Strauss, J. and Taurok, A. and Treberer-Treberspurg, W. and Waltenberger, W. and Bencze, György and Hajdu, Csaba and Hidas, Pál and Horváth, Dezső and Siklér, Ferenc and Veszprémi, Viktor and Vesztergombi, György and Zsigmond, Anna Júlia and Molnár, József and Pálinkás, József and Karancsi, János and Raics, Péter and Trócsányi, Zoltán and Ujvári, Balázs and Krajczár, Krisztián and Veres, Gábor (2013) Measurement of masses in the tt̄ system by kinematic endpoints in pp collisions at √s = 7 TeV. EUROPEAN PHYSICAL JOURNAL C, 73 (7). ISSN 1434-6044

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Abstract

A simultaneous measurement of the top-quark, W-boson, and neutrino masses is re- ported for tt events selected in the dilepton final state from a data sample correspond- ing to an integrated luminosity of 5.0 fb−1 collected by the CMS experiment in pp col- lisions 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 scenar- ios where several masses in a decay chain may be unknown and undetected particles lead to underconstrained kinematics.

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