We present a measurement of the W-boson polarization in top-quark decays in t (t) over bar events with decays to dilepton final states using data corresponding to 5.1 fb(-1) of integrated luminosity in p (p) over bar collisions collected by the CDF II detector at the Tevatron. Assuming a top-quark mass of 172.5 GeV/c(2), a simultaneous measurement of the fractions of longitudinal (f(0)) and right-handed (f(+)) W-bosons yields the results f(0) = 0.70(-0.17)(+0.18)(stat) +/- 0.06(syst) and f(+) = -0.09 +/- 0.09(stat) +/- 0:03(syst). Combining this measurement with our previous measurement based on single-lepton final states, we obtain f(0) = 0.84 +/- 0.09(stat) +/- 0.05(syst) and f(+) = -0.16 +/- 0.05(stat) +/- 0.04(syst). The results are consistent with the standard model expectation.

Aaltonen, T., Gonzalez, B.A., Amerio, S., Amidei, D., Anastassov, A., Annovi, A., et al. (2013). W-boson polarization measurement in the t(t)over-bar dilepton channel using the CDF II detector. PHYSICS LETTERS. SECTION B, 722, 48-54 [10.1016/j.physletb.2013.03.032].

W-boson polarization measurement in the t(t)over-bar dilepton channel using the CDF II detector

Brigliadori, L;Castro, A;Deninno, M;Moggi, N;Mussini, M;Rimondi, F;Zucchelli, S
2013

Abstract

We present a measurement of the W-boson polarization in top-quark decays in t (t) over bar events with decays to dilepton final states using data corresponding to 5.1 fb(-1) of integrated luminosity in p (p) over bar collisions collected by the CDF II detector at the Tevatron. Assuming a top-quark mass of 172.5 GeV/c(2), a simultaneous measurement of the fractions of longitudinal (f(0)) and right-handed (f(+)) W-bosons yields the results f(0) = 0.70(-0.17)(+0.18)(stat) +/- 0.06(syst) and f(+) = -0.09 +/- 0.09(stat) +/- 0:03(syst). Combining this measurement with our previous measurement based on single-lepton final states, we obtain f(0) = 0.84 +/- 0.09(stat) +/- 0.05(syst) and f(+) = -0.16 +/- 0.05(stat) +/- 0.04(syst). The results are consistent with the standard model expectation.
2013
Aaltonen, T., Gonzalez, B.A., Amerio, S., Amidei, D., Anastassov, A., Annovi, A., et al. (2013). W-boson polarization measurement in the t(t)over-bar dilepton channel using the CDF II detector. PHYSICS LETTERS. SECTION B, 722, 48-54 [10.1016/j.physletb.2013.03.032].
Aaltonen, T; Gonzalez, BA; Amerio, S; Amidei, D; Anastassov, A; Annovi, A; Antos, J; Apollinari, G; Appel, JA; Arisawa, T; Artikov, A; Asaadi, J; Ashm...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/233319
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