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

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URI: http://hdl.handle.net/10902/2175
ISSN: 1550-7998
ISSN: 1550-2368
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Autoría
Aaltonen, Timo Antero; Abazov, Victor Mukhamedovich; Abbott, Brad K.; Acharya, Bobby Samir; Adams, Malcolm R.; Adams, Todd R.; Adelman, Jahred; Aguiló, Ernest; Álvarez González, Bárbara; Casal Laraña, Bruno; Cuevas Maestro, Francisco Javier; Gómez Gramuglio, GervasioAutoridad Unican; Palencia Cortezón, José Enrique; Rodrigo Anoro, TeresaAutoridad Unican; Ruiz Jimeno, AlbertoAutoridad Unican; Scodellaro, LucaAutoridad Unican; Vila Álvarez, Iván Autoridad Unican; Vilar Cortabitarte, RocíoAutoridad Unican; Vizán García, Jesús ManuelAutoridad Unican; [et al.]
Fecha
2012-04-27
Derechos
©2012 American Physical Society
Publicado en
Physical review. D, Particles, fields, gravitation, and cosmology, 2012, 85(7), 071106(R)
Editorial
American Physical Society
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Resumen/Abstract
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-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 (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.
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