An improved measurement of the forward-backward asymmetry in Z --> b (b) over bar decays is presented, based on a sample of 4.1 million hadronic Z decays collected by ALEPH between 1991 and 1995. Data are analysed as a function of polar angle of the event axis and b purity. The event tagging efficiency and mean b-jet hemisphere charge are measured directly from data. From the measured forward-backward jet charge asymmetry, the b quark asymmetry at root s= m(Z) is determined to be: A(FB)(b) = 0.1017 +/- 0.0032(syst.) +/- 0.0032(syst.). In the context of the Standard Model this corresponds to a value of the effective weak mixing angle of sin(2) theta(W)(eff)= 0.23109 +/- 0.00096

Determination of A(FB)(b) using jet charge measurements in Z decays / Barate, R., Buskulic, D., Decamp, D., Ghez, P., Coy, C., Lees, J.p., Lucotte, A., Merle, E., Minard, M.n., Nief, J.y., Pietrzyk, B., Alemany, R., Boix, G., Casado, M.p., Chmeissani, M., Crespo, J.m., Delfino, M., Fernandez, E., Fernandez Bosman, M., Garrido, L., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 426:1-2(1998), pp. 217-230. [10.1016/S0370-2693(98)00345-1]

Determination of A(FB)(b) using jet charge measurements in Z decays

CREANZA, Donato Maria;IASELLI, Giuseppe;MAGGI, Giorgio Pietro;
1998

Abstract

An improved measurement of the forward-backward asymmetry in Z --> b (b) over bar decays is presented, based on a sample of 4.1 million hadronic Z decays collected by ALEPH between 1991 and 1995. Data are analysed as a function of polar angle of the event axis and b purity. The event tagging efficiency and mean b-jet hemisphere charge are measured directly from data. From the measured forward-backward jet charge asymmetry, the b quark asymmetry at root s= m(Z) is determined to be: A(FB)(b) = 0.1017 +/- 0.0032(syst.) +/- 0.0032(syst.). In the context of the Standard Model this corresponds to a value of the effective weak mixing angle of sin(2) theta(W)(eff)= 0.23109 +/- 0.00096
1998
Determination of A(FB)(b) using jet charge measurements in Z decays / Barate, R., Buskulic, D., Decamp, D., Ghez, P., Coy, C., Lees, J.p., Lucotte, A., Merle, E., Minard, M.n., Nief, J.y., Pietrzyk, B., Alemany, R., Boix, G., Casado, M.p., Chmeissani, M., Crespo, J.m., Delfino, M., Fernandez, E., Fernandez Bosman, M., Garrido, L., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 426:1-2(1998), pp. 217-230. [10.1016/S0370-2693(98)00345-1]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/841
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