The Wboson helicity fractions from top quark decays in ttevents are measured using data from proton–proton collisions at a centre-of-mass energy of 8 TeV. The data were collected in 2012 with the CMS detector at the LHC, corresponding to an integrated luminosity of 19.8 fb−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 F0=0.681 ±0.012 (stat)±0.023 (syst), FL=0.323 ±0.008 (stat)±0.014 (syst), and FR=−0.004 ±0.005 (stat)±0.014 (syst)for the longitudinal, left-, and right-handed components of the helicity, respectively. These measurements of the Wboson helicity fractions are the most accurate to date and they agree with the predictions from the standard model.

(2016). 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 [journal article - articolo]. In PHYSICS LETTERS. SECTION B. Retrieved from http://hdl.handle.net/10446/140662

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

Re, V.;Vai, I.;
2016-01-01

Abstract

The Wboson helicity fractions from top quark decays in ttevents are measured using data from proton–proton collisions at a centre-of-mass energy of 8 TeV. The data were collected in 2012 with the CMS detector at the LHC, corresponding to an integrated luminosity of 19.8 fb−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 F0=0.681 ±0.012 (stat)±0.023 (syst), FL=0.323 ±0.008 (stat)±0.014 (syst), and FR=−0.004 ±0.005 (stat)±0.014 (syst)for the longitudinal, left-, and right-handed components of the helicity, respectively. These measurements of the Wboson helicity fractions are the most accurate to date and they agree with the predictions from the standard model.
articolo
2016
Khachatryan, V.; Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Asilar, E.; Bergauer, T.; Brandstetter, J.; Brondolin, E.; Dragicevic, M.; Erö, J.; Flechl, ...espandi
(2016). 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 [journal article - articolo]. In PHYSICS LETTERS. SECTION B. Retrieved from http://hdl.handle.net/10446/140662
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10446/140662
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