The neutrino energy spectrum in semileptonic b-hadron decays with identified energetic electrons and muons has been measured. The observed relative energy sharing between the neutrino and the charged lepton is found to be well described with a W-+/- polarization obtained from a free b-quark decay model with a (V-A)x(V-A) decay structure. The alternative of a (V+A) x(V-A) decay structure is excluded with a significance of more than 6 standard deviations. The possibility that hadronic corrections to the b-hadron decay destroy any W-+/- polarization is disfavored by more than 3 standard deviations.

Measurement of the Weak Charged Current Structure In Semileptonic B-hadron Decays At the Z-peak / Acciarri, M., Adam, A., Adriani, O., Aguilarbenitez, M., Ahlen, S., Alcaraz, J., Aloisio, A., Alverson, G., Alviggi, M., Ambrosi, G., An, Q., Anderhub, H., Anderson, A.L., Andreev, V.P., Angelescu, T., Antonov, L., Antreasyan, D., Alkhazov, G., Arefiev, A., Azemoon, T., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 351:(1995), pp. 375-386. [10.1016/0370-2693(95)00401-6]

Measurement of the Weak Charged Current Structure In Semileptonic B-hadron Decays At the Z-peak

ALOISIO, ALBERTO;ALVIGGI, MARIAGRAZIA;CHIEFARI, GIOVANNI;L. LISTA;MEROLA, LEONARDO;NAPOLITANO, MARCO;PATRICELLI, SERGIO;SCIACCA, CRISOSTOMO;
1995

Abstract

The neutrino energy spectrum in semileptonic b-hadron decays with identified energetic electrons and muons has been measured. The observed relative energy sharing between the neutrino and the charged lepton is found to be well described with a W-+/- polarization obtained from a free b-quark decay model with a (V-A)x(V-A) decay structure. The alternative of a (V+A) x(V-A) decay structure is excluded with a significance of more than 6 standard deviations. The possibility that hadronic corrections to the b-hadron decay destroy any W-+/- polarization is disfavored by more than 3 standard deviations.
1995
Measurement of the Weak Charged Current Structure In Semileptonic B-hadron Decays At the Z-peak / Acciarri, M., Adam, A., Adriani, O., Aguilarbenitez, M., Ahlen, S., Alcaraz, J., Aloisio, A., Alverson, G., Alviggi, M., Ambrosi, G., An, Q., Anderhub, H., Anderson, A.L., Andreev, V.P., Angelescu, T., Antonov, L., Antreasyan, D., Alkhazov, G., Arefiev, A., Azemoon, T., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 351:(1995), pp. 375-386. [10.1016/0370-2693(95)00401-6]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/478891
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