We use the transverse momentum spectrum of leptons in the decay chain t --> bW with W --> l nu to measure the helicity of the W bosons in the top quark rest frame. Ourmeasurement uses a tt sample isolated in 106 +/- 4 pb(-1) of data collected in collisions at root 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 F-0 = 0.91 +/- 0.37(stat) +/- 0.13(syst), consistent with the standard model prediction of F-0 = 0.70 for a top mass of 175 GeV/c(2).

T., A., H., A., A., A., M. G., A., P., A., S. R., A., et al. (2000). Measurement of the helicity of W bosons in top quark decays. PHYSICAL REVIEW LETTERS, 84(2), 216-221 [10.1103/PhysRevLett.84.216].

Measurement of the helicity of W bosons in top quark decays

PAOLETTI, RICCARDO;
2000-01-01

Abstract

We use the transverse momentum spectrum of leptons in the decay chain t --> bW with W --> l nu to measure the helicity of the W bosons in the top quark rest frame. Ourmeasurement uses a tt sample isolated in 106 +/- 4 pb(-1) of data collected in collisions at root 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 F-0 = 0.91 +/- 0.37(stat) +/- 0.13(syst), consistent with the standard model prediction of F-0 = 0.70 for a top mass of 175 GeV/c(2).
2000
T., A., H., A., A., A., M. G., A., P., A., S. R., A., et al. (2000). Measurement of the helicity of W bosons in top quark decays. PHYSICAL REVIEW LETTERS, 84(2), 216-221 [10.1103/PhysRevLett.84.216].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/39636
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