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W boson polarization measurement in the tt¯ dilepton channel using the CDF II Detector


CDF Collaboration; et al; Canelli, F; Kilminster, B (2013). W boson polarization measurement in the tt¯ dilepton channel using the CDF II Detector. Physics Letters B, 722(1-3):48-54.

Abstract

We present a measurement of W boson polarization in top-quark decays in tt¯ events with decays to dilepton final states using 5.1fb−1 of integrated luminosity in pp¯ collisions collected by the CDF II detector at the Tevatron. A simultaneous measurement of the fractions of longitudinal (f0) and right-handed (f+) W bosons yields the results f0=0.71+0.18−0.17(stat)±0.06(syst) and f+=−0.07±0.09(stat)±0.03(syst). Combining this measurement with our previous result based on single lepton final states, we obtain f0=0.84±0.09(stat)±0.05(syst) and f+=−0.16±0.05(stat)±0.04(syst). The results are consistent with standard model expectation.

Abstract

We present a measurement of W boson polarization in top-quark decays in tt¯ events with decays to dilepton final states using 5.1fb−1 of integrated luminosity in pp¯ collisions collected by the CDF II detector at the Tevatron. A simultaneous measurement of the fractions of longitudinal (f0) and right-handed (f+) W bosons yields the results f0=0.71+0.18−0.17(stat)±0.06(syst) and f+=−0.07±0.09(stat)±0.03(syst). Combining this measurement with our previous result based on single lepton final states, we obtain f0=0.84±0.09(stat)±0.05(syst) and f+=−0.16±0.05(stat)±0.04(syst). The results are consistent with standard model expectation.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2013
Deposited On:20 Feb 2014 09:14
Last Modified:05 Apr 2016 17:37
Publisher:Elsevier
ISSN:0370-2693
Publisher DOI:https://doi.org/10.1016/j.physletb.2013.03.032

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