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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. 1; Baus, C. 1; Berger, J. 1; Butz, E. 1; Chwalek, T. 1; Colombo, F. 1; De Boer, W. 1; Dierlamm, A. ORCID iD icon 1; Fink, S. 1; Friese, R. 1; Giffels, M. ORCID iD icon 1; Gilbert, A. 1; Haitz, D. 1; Hartmann, F. 1; Heindl, S. M. 1; Husemann, U. 1; Katkov, I. 1; Lobelle Pardo, P. 1; ... 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.

Volltext §
DOI: 10.5445/IR/1000062440
DOI: 10.1016/j.physletb.2016.10.007
Zitationen: 52
Zitationen: 23
Cover der Publikation
Zugehörige Institution(en) am KIT Fakultät für Physik – Institut für Experimentelle Kernphysik (IEKP)
Institut für Prozessdatenverarbeitung und Elektronik (IPE)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2016
Sprache Englisch
Identifikator ISSN: 0370-2693, 1873-2445
KITopen-ID: 1000062440
Erschienen in Physics letters / B
Verlag North-Holland Publishing
Band 762
Seiten 512–534
Bemerkung zur Veröffentlichung Gefördert durch SCOAP3
Schlagwörter CMS; Physics; Top; Anomalous couplings; Helicity
Nachgewiesen in Web of Science
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