Measurement of the W boson helicity in top quark decays at D0
Contribuinte(s) |
Universidade Estadual Paulista (UNESP) |
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Data(s) |
20/05/2014
20/05/2014
01/02/2007
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Resumo |
We present a measurement of the fraction f(+) of right-handed W bosons produced in top quark decays, based on a candidate sample of tt events in the l + jets and dilepton decay channels corresponding to an integrated luminosity of 370 pb(-1) collected by the D0 detector at the Fermilab Tevatron pp Collider at root s = 1.96 TeV. We reconstruct the decay angle theta* for each lepton. By comparing the cos theta* distribution from the data with that for the expected background and signal for various values of f(+) (where we assume that the fraction of longitudinally-polarized W bosons has the standard model value of 0.70), we find f(+) = 0.056 +/- 0.080 (stat) +/- 0.057 (syst) (f(+) < 0.23 at 95% C. L.), consistent with the standard model prediction of f(+) = 3.6 X 10(-4). |
Formato |
8 |
Identificador |
http://dx.doi.org/10.1103/PhysRevD.75.031102 Physical Review D. College Pk: American Physical Soc, v. 75, n. 3, 8 p., 2007. 1550-7998 http://hdl.handle.net/11449/23571 10.1103/PhysRevD.75.031102 WOS:000244534800002 WOS000244534800002.pdf |
Idioma(s) |
eng |
Publicador |
American Physical Soc |
Relação |
Physical Review D |
Direitos |
closedAccess |
Tipo |
info:eu-repo/semantics/article |