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. (C) 2013 Elsevier B.V. All rights reserved.

W-boson polarization measurement in the t(t)over-bar dilepton channel using the CDF II detector / T., A., B. A., G., S., A., D., A., A., A., A., A., J., A., G., A., J. A., A., T., A., A., A., J., A., W., A., B., A., A., A., R., A., W., B., T., B., A., B.G., V. E., B., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 722:(2013), pp. 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

BAUCE, MATTEO;GIAGU, Stefano;IORI, Maurizio;MARGAROLI, Fabrizio;
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. (C) 2013 Elsevier B.V. All rights reserved.
2013
01 Pubblicazione su rivista::01a Articolo in rivista
W-boson polarization measurement in the t(t)over-bar dilepton channel using the CDF II detector / T., A., B. A., G., S., A., D., A., A., A., A., A., J., A., G., A., J. A., A., T., A., A., A., J., A., W., A., B., A., A., A., R., A., W., B., T., B., A., B.G., V. E., B., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 722:(2013), pp. 48-54. [10.1016/j.physletb.2013.03.032]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/555848
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