Combination of CDF and D0 measurements of the W boson helicity in top quark decays
Author(s)Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Paus, Christoph M. E.
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We 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[superscript -1] of pp̅ collisions collected during Run II of the Fermilab Tevatron collider. Combining measurements that simultaneously determine the fractions of W bosons with longitudinal (f[subscript 0]) and right-handed (f[subscript +]) helicities, we find f[subscript 0]=0.722±0.081[±0.062(stat)±0.052(syst)] and f[subscript +]=-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 f[subscript 0]=0.682±0.057[±0.035(stat)±0.046(syst)] for fixed f[subscript +] and f[subscript +]=-0.015±0.035[±0.018(stat)±0.030(syst)] for fixed f[subscript 0]. The results are consistent with standard model expectations.
DepartmentMassachusetts Institute of Technology. Laboratory for Nuclear Science
Physical Review D
American Physical Society
T. Aaltonen et al. (CDF and D0 Collaborations)."Combination of CDF and D0 measurements of the W boson helicity in top quark decays" Physical Review D 85, 071106(R) (2012). © 2012 American Physical Society
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