The e+e--->W+W- cross section is measured in a data sample collected by ALEPH at a mean centre-of-mass energy of 172.09 GeV, corresponding to an integrated luminosity of 10.65 pb-1. Cross sections are given for the three topologies, fully leptonic, semi-leptonic and hadronic of a W-pair decay. Under the assumption that no other decay modes are present, the W-pair cross section is measured to be 11.7+/-1.2(stat.)+/-0.3(syst.) pb. The existence of the triple gauge boson vertex of the Standard Model is clearly preferred by the data. The decay branching ratio of the W boson into hadrons is measured to be B(W-->hadrons)=67.7+/-3.1(stat.)+/-0.7(syst.) %, allowing a determination of the CKM matrix element Vcs=0.98+/-0.14(stat.)+/-0.03(syst.).

Measurement of the W-pair cross section in e+e− collisions at 172 GeV / R., B., D., B., D., D., P., G., C., G., J. P., L., A., L., M. N., M., J. Y., N., B., P., M. P., C., M., C., P., C., J. M., C., M., D., E., F., M., F.B., Ll, G., A., J., M., M., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 415:(1997), pp. 435-444. [10.1016/S0370-2693(97)01266-5]

Measurement of the W-pair cross section in e+e− collisions at 172 GeV

GREGORIO, ANNA;BOSISIO, LUCIANO;GIANNINI, GIANROSSANO;
1997-01-01

Abstract

The e+e--->W+W- cross section is measured in a data sample collected by ALEPH at a mean centre-of-mass energy of 172.09 GeV, corresponding to an integrated luminosity of 10.65 pb-1. Cross sections are given for the three topologies, fully leptonic, semi-leptonic and hadronic of a W-pair decay. Under the assumption that no other decay modes are present, the W-pair cross section is measured to be 11.7+/-1.2(stat.)+/-0.3(syst.) pb. The existence of the triple gauge boson vertex of the Standard Model is clearly preferred by the data. The decay branching ratio of the W boson into hadrons is measured to be B(W-->hadrons)=67.7+/-3.1(stat.)+/-0.7(syst.) %, allowing a determination of the CKM matrix element Vcs=0.98+/-0.14(stat.)+/-0.03(syst.).
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2563015
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