Model-independent measurement of the W-boson helicity in top-quark decays at D0
Contribuinte(s) |
Universidade Estadual Paulista (UNESP) |
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Data(s) |
30/09/2013
20/05/2014
30/09/2013
20/05/2014
15/02/2008
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Resumo |
We present the first model-independent measurement of the helicity of W bosons produced in top quark decays, based on a 1 fb(-1) sample of candidate t (t) over bar events in the dilepton and lepton plus jets channels collected by the D0 detector at the Fermilab Tevatron p (p) over bar Collider. We reconstruct the angle theta(*) between the momenta of the down-type fermion and the top quark in the W boson rest frame for each top quark decay. A fit of the resulting cos theta(*) distribution finds that the fraction of longitudinal W bosons f(0)=0.425 +/- 0.166(stat)+/- 0.102(syst) and the fraction of right-handed W bosons f(+)=0.119 +/- 0.090(stat)+/- 0.053(syst), which is consistent at the 30% C.L. with the standard model. |
Formato |
7 |
Identificador |
http://dx.doi.org/10.1103/PhysRevLett.100.062004 Physical Review Letters. College Pk: Amer Physical Soc, v. 100, n. 6, p. 7, 2008. 0031-9007 http://hdl.handle.net/11449/24471 10.1103/PhysRevLett.100.062004 WOS:000253238400017 WOS000253238400017.pdf |
Idioma(s) |
eng |
Publicador |
Amer Physical Soc |
Relação |
Physical Review Letters |
Direitos |
closedAccess |
Tipo |
info:eu-repo/semantics/article |