Based on a sample of four million events collected by ALEPH from 1991 to 1995, a measurement of the forward-backward asymmetry in Z --> b (b) over bar decays using inclusive final states is presented. High-performance tagging of b (b) over bar events in a wide angular range is achieved using neural network techniques. An optimal hemisphere charge estimator is built by merging primary and secondary vertex information, leading kaon identification and jet charge in a neural network. The average charge asymmetry, the flavour tagging efficiencies and mean b-hemisphere charges are measured from data and used to extract the pole b asymmetry in the Standard Model A(FB)(o,b) = 0.1011 +/- 0.0012 (syst), corresponding to a value of the effective weak mixing angle of sin(2)theta(W)(eff) = 0.23189 +/- 0.00056.

Measurement of A(FB)(b) using inclusive b-hadron decays / Heister, A., Schael, S., Barate, R., De Bonis, I., Decamp, D., Goy, C., Lees, J.p., Merle, E., Minard, A.n., Pietrzyk, B., Bravo, S., Casado, M.p., Chmeissani, M., Crespo, J.m., Fernandez, E., Fernandez Bosman, M., Garrido, L., Grauges, E., Martinez, M., Merino, G., et al.. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - STAMPA. - 22:2(2001), pp. 201-215. [10.1007/s100520100812]

Measurement of A(FB)(b) using inclusive b-hadron decays

CREANZA, Donato Maria;IASELLI, Giuseppe;MAGGI, Giorgio Pietro;
2001

Abstract

Based on a sample of four million events collected by ALEPH from 1991 to 1995, a measurement of the forward-backward asymmetry in Z --> b (b) over bar decays using inclusive final states is presented. High-performance tagging of b (b) over bar events in a wide angular range is achieved using neural network techniques. An optimal hemisphere charge estimator is built by merging primary and secondary vertex information, leading kaon identification and jet charge in a neural network. The average charge asymmetry, the flavour tagging efficiencies and mean b-hemisphere charges are measured from data and used to extract the pole b asymmetry in the Standard Model A(FB)(o,b) = 0.1011 +/- 0.0012 (syst), corresponding to a value of the effective weak mixing angle of sin(2)theta(W)(eff) = 0.23189 +/- 0.00056.
2001
Measurement of A(FB)(b) using inclusive b-hadron decays / Heister, A., Schael, S., Barate, R., De Bonis, I., Decamp, D., Goy, C., Lees, J.p., Merle, E., Minard, A.n., Pietrzyk, B., Bravo, S., Casado, M.p., Chmeissani, M., Crespo, J.m., Fernandez, E., Fernandez Bosman, M., Garrido, L., Grauges, E., Martinez, M., Merino, G., et al.. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - STAMPA. - 22:2(2001), pp. 201-215. [10.1007/s100520100812]
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/3075
Citazioni
  • Scopus 19
  • ???jsp.display-item.citation.isi??? 22
social impact