We measure the polarization of W bosons from top-quark (t) decays into final states with a charged lepton and jets, t (t) over bar -> W(+)bW(-)(b) over bar -> lvbq (q) over bar (1)(b) over bar, using the full Run II data set collected by the CDF II detector, corresponding to an integrated luminosity of 8.7 fb(-1). A model-independent method simultaneously determines the fraction of longitudinal (f(0)) and right-handed (f(+)) W bosons to yield f(0) = 0.726 +/- 0.066(stat) +/- 0.067(syst) and f(+) = -0.045 +/- 0.044(stat) +/- 0.058(syst) with a correlation coefficient of -0.69. Additional results are presented under various standard model assumptions. No significant discrepancies with the standard model are observed. DOI: 10.1103/PhysRevD.87.031104

Measurement of W-boson polarization in top-quark decay using the full CDF Run II data set

MORELLO, MICHAEL JOSEPH;
2013

Abstract

We measure the polarization of W bosons from top-quark (t) decays into final states with a charged lepton and jets, t (t) over bar -> W(+)bW(-)(b) over bar -> lvbq (q) over bar (1)(b) over bar, using the full Run II data set collected by the CDF II detector, corresponding to an integrated luminosity of 8.7 fb(-1). A model-independent method simultaneously determines the fraction of longitudinal (f(0)) and right-handed (f(+)) W bosons to yield f(0) = 0.726 +/- 0.066(stat) +/- 0.067(syst) and f(+) = -0.045 +/- 0.044(stat) +/- 0.058(syst) with a correlation coefficient of -0.69. Additional results are presented under various standard model assumptions. No significant discrepancies with the standard model are observed. DOI: 10.1103/PhysRevD.87.031104
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11384/39043
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