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Compact Muon Solenoid
LHC, CERN
CMS-PAS-TOP-14-017
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Measurement of the W boson helicity using tˉt events in the dilepton final state at √s= 8 TeV
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CMS Collaboration
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July 2015
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Abstract:
A measurement of the W boson helicity fractions in top quark decays is presented. The measurement is performed using a sample of top quark pair events with two opposite-sign leptons (electron or muon) in the final state. The sample was recorded in proton-proton collisions at a center-of-mass energy of 8 TeV, and corresponds to an integrated luminosity of 19.7fb−1. The longitudinal, left-handed and right-handed helicity fractions are measured to be F0=0.653±0.016(stat)±0.024(syst), FL=0.329±0.009(stat)±0.025(syst) and FR=0.018±0.008(stat)±0.026(syst), respectively. The results are found to be in agreement with predictions of the standard model.
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Links:
CDS record (PDF) ;
inSPIRE record ;
Public twiki page ;
CADI line (restricted) ;
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Compact Muon Solenoid LHC, CERN
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