Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at root s=8 TeV [Elektronisk resurs]
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Aad, G. (författare)
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Asimakopoulou, Eleni M. (författare)
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Bergeås Kuutmann, Elin, 1980- (författare)
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Bokan, Petar (författare)
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Brenner, Richard (författare)
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Ekelöf, Tord (författare)
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Ellajosyula, Venugopal (författare)
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Ellert, Mattias (författare)
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Ferrari, Arnaud, 1973- (författare)
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Gonzalez Suarez, Rebeca (författare)
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Isacson, Max F. (författare)
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Mårtensson, Mikael U. F. (författare)
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Trembath-reichert, S. (författare)
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Uppsala universitet Teknisk-naturvetenskapliga vetenskapsområdet (utgivare)
- Publicerad: SPRINGER, 2020
- Engelska.
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Ingår i: Journal of High Energy Physics (JHEP). - 1126-6708. ; 8
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Sammanfattning
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- The combination of measurements of the W boson polarization in top quark decays performed by the ATLAS and CMS collaborations is presented. The measurements are based on proton-proton collision data produced at the LHC at a centre-of-mass energy of 8 TeV, and corresponding to an integrated luminosity of about 20 fb(-1)for each experiment. The measurements used events containing one lepton and having different jet multiplicities in the final state. The results are quoted as fractions of W bosons with longitudinal (F-0), left-handed (F-L), or right-handed (F-R) polarizations. The resulting combined measurements of the polarization fractions are F-0= 0.693 +/- 0.014 and F-L= 0.315 +/- 0.011. The fractionF(R)is calculated from the unitarity constraint to be F-R=-0.008 +/- 0.007. These results are in agreement with the standard model predictions at next-to-next-to-leading order in perturbative quantum chromodynamics and represent an improvement in precision of 25 (29)% for F-0(F-L) with respect to the most precise single measurement. A limit on anomalous right-handed vector (V-R), and left- and right-handed tensor (g(L), g(R)) tWb couplings is set while fixing all others to their standard model values. The allowed regions are [-0.11,0.16] for V-R, [-0.08,0.05] for g(L), and [-0.04,0.02] for g(R), at 95% confidence level. Limits on the corresponding Wilson coefficients are also derived.
Ämnesord
- Natural Sciences (hsv)
- Physical Sciences (hsv)
- Subatomic Physics (hsv)
- Naturvetenskap (hsv)
- Fysik (hsv)
- Subatomär fysik (hsv)
Genre
- government publication (marcgt)
Indexterm och SAB-rubrik
- Hadron-Hadron scattering (experiments)
- Top physics
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Journal of High Energy Physics (JHEP)