A new measurement of the forward-backward asymmetry in Z --> bbBAR decays is presented. Hadrons from b decays are tagged using their long lifetimes. The b quark charge and direction are reconstructed with a hemisphere charge algorithm. The asymmetry and reconstructed b hemisphere charge are measured in the 69 pb-1 of data collected by ALEPH during 1991, 1992 and 1993. They are used to extract sin2theta(w)eff, which is determined to be 0.2315 +/- 0.0016 (stat.) +/- 0.0009 (syst.), corresponding to an A(FB)b of 0.00992 +/- 0.0084 (stat.) +/- 0.0046 (stat.).

A Measurement of A(fb)(b) In Lifetime Tagged Heavy Flavor Z Decays / D. BUSKULIC, D. CASPER, I. DEBONIS, D. DECAMP, P. GHEZ, C. GOY, J. P. LEES, M. N. MINARD, P. ODIER, B. PETRZYK, F. ARIZTIZABAL, M. CHMEISSANI, J. M. CRESPO, I. EFTHYMIOPOULOS, E. FERNANDEZ, M. FERNANDEZBOSMAN, V. GAITAN, L. I. GARRIDO, M. MARTINEZ, T. MATTISON, et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 335:(1994), pp. 99-108. [10.1016/0370-2693(94)91564-4]

A Measurement of A(fb)(b) In Lifetime Tagged Heavy Flavor Z Decays

FOCARDI, ETTORE;CIULLI, VITALIANO;
1994

Abstract

A new measurement of the forward-backward asymmetry in Z --> bbBAR decays is presented. Hadrons from b decays are tagged using their long lifetimes. The b quark charge and direction are reconstructed with a hemisphere charge algorithm. The asymmetry and reconstructed b hemisphere charge are measured in the 69 pb-1 of data collected by ALEPH during 1991, 1992 and 1993. They are used to extract sin2theta(w)eff, which is determined to be 0.2315 +/- 0.0016 (stat.) +/- 0.0009 (syst.), corresponding to an A(FB)b of 0.00992 +/- 0.0084 (stat.) +/- 0.0046 (stat.).
1994
335
99
108
D. BUSKULIC;D. CASPER;I. DEBONIS;D. DECAMP;P. GHEZ;C. GOY;J. P. LEES;M. N. MINARD;P. ODIER;B. PETRZYK;F. ARIZTIZABAL;M. CHMEISSANI;J. M. ...espandi
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/770617
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