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Title

Combination of CDF and D0 measurements of the W boson helicity in top quark decays

AuthorsAaltonen, T.; Álvarez González, B.; Casal, Bruno ; Cuevas, Javier ; Gómez, G. ; Rodrigo, Teresa ; Ruiz Jimeno, Alberto ; Scodellaro, Luca ; Vila, Iván ; Vilar, Rocío ; CDF and D0 Collaborations
Issue Date2012
PublisherAmerican Physical Society
CitationPhysical Review D 85: 071106(R) (2012)
AbstractWe report the combination of recent measurements of the helicity of the W boson from top quark decay by the CDF and D0 collaborations, based on data samples corresponding to integrated luminosities of 2.7–5.4  fb-1 of pp¯ collisions collected during Run II of the Fermilab Tevatron collider. Combining measurements that simultaneously determine the fractions of W bosons with longitudinal (f0) and right-handed (f+) helicities, we find f0=0.722±0.081[±0.062(stat)±0.052(syst)] and f+=-0.033±0.046[±0.034(stat)±0.031(syst)]. Combining measurements where one of the helicity fractions is fixed to the value expected in the standard model, we find f0=0.682±0.057[±0.035(stat)±0.046(syst)] for fixed f+ and f+=-0.015±0.035[±0.018(stat)±0.030(syst)] for fixed f0. The results are consistent with standard model expectations.
DescriptionAaltonen, T. et al.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevD.85.071106
URIhttp://hdl.handle.net/10261/108634
DOI10.1103/PhysRevD.85.071106
Identifiersdoi: 10.1103/PhysRevD.85.071106
issn: 1550-7998
e-issn: 1550-2368
Appears in Collections:(IFCA) Artículos
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