Measurement of the helicity of W bosons in top quark decays |
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Authors: | Ukegawa Valls Vejcik Velev Vidal Vilar Vologouev Vucinic Wagner Wagner Wahl Wallace Walsh Wang Wang Wang Watanabe Watts Webb Wenzel Wester Wicklund Wicklund Williams Wilson Winer |
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Affiliation: | Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA. |
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Abstract: | We use the transverse momentum spectrum of leptons in the decay chain t-->bW with W-->lnu to measure the helicity of the W bosons in the top quark rest frame. Our measurement uses a t&tmacr; sample isolated in 106+/-4 pb(-1) of data collected in p&pmacr; collisions at sqrt[s] = 1.8 TeV with the CDF detector at the Fermilab Tevatron. Assuming a standard V-A weak decay, we find that the fraction of W's with zero helicity in the top rest frame is F0 = 0.91+/-0. 37(stat)+/-0.13(syst), consistent with the standard model prediction of F0 = 0.70 for a top mass of 175 GeV/c(2). |
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