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.

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

CIOCCI, MARIA AGNESE;DONATI, SIMONE;A. Driutti;PUNZI, GIOVANNI;F. Ruffini;
2013-01-01

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.
2013
Aaltonen, T.; Amerio, S.; Amidei, D.; Anastassov, A.; Annovi, A.; Antos, J.; Apollinari, G.; Appel, J. A.; Arisawa, T.; Artikov, A.; Asaadi, J.; Ashma...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/828772
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