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Measurement of the W boson helicity fractions in the decays of top quark pairs to lepton+jets final states produced in pp collisions at s=8TeV

CMS Collaboration; Barth, C.; Baus, C.; Berger, J.; Butz, E.; Chwalek, T.; Colombo, F.; De Boer, W.; Dierlamm, A.; Fink, S.; Friese, R.; Giffels, M.; Gilbert, A.; Haitz, D.; Hartmann, F.; Heindl, S.M.; Husemann, U.; Katkov, I.; Lobelle Pardo, P.; Maier, B.; Mildner, H.; ... mehr

Abstract (englisch):
The W boson helicity fractions from top quark decays in View the MathML sourcett‾ events are measured using data from proton–proton collisions at a centre-of-mass energy of View the MathML source8TeV. The data were collected in 2012 with the CMS detector at the LHC, corresponding to an integrated luminosity of View the MathML source19.8fb−1. Events are reconstructed with either one muon or one electron, along with four jets in the final state, with two of the jets being identified as originating from b quarks. The measured helicity fractions from both channels are combined, yielding View the MathML sourceF0=0.681±0.012(stat)±0.023(syst), View the MathML sourceFL=0.323±0.008(stat)±0.014(syst), and View the MathML sourceFR=−0.004±0.005(stat)±0.014(syst) for the longitudinal, left-, and right-handed components of the helicity, respectively. These measurements of the W boson helicity fractions are the most accurate to date and they agree with the predictions from the standard model.

Zugehörige Institution(en) am KIT Institut für Experimentelle Kernphysik (IEKP)
Publikationstyp Zeitschriftenaufsatz
Jahr 2016
Sprache Englisch
Identifikator DOI: 10.1016/j.physletb.2016.10.007
ISSN: 0370-2693, 1873-2445
URN: urn:nbn:de:swb:90-624405
KITopen ID: 1000062440
Erschienen in Physics letters / B
Band 762
Seiten 512–534
Lizenz CC BY 4.0: Creative Commons Namensnennung 4.0 International
Bemerkung zur Veröffentlichung Gefördert durch SCOAP3
Schlagworte CMS; Physics; Top; Anomalous couplings; Helicity
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