The total cross section and the forward-backward asymmetry for the process e(+)e --> mu(+)mu(-)(n gamma) are measured in the energy range 20-136 GeV by reconstructing the effective centre-of-mass energy after initial state radiation. The analysis is based on the data recorded with the ALEPH detector at LEP between 1990 and 1995, corresponding to a total integrated luminosity of 143.5 pb(-1). Two different approaches are used: in the first one an exclusive selection of events with hard initial state radiation in the energy range 20-88 GeV is directly compared with the Standard Model predictions showing good agreement. In the second one, all events are used to obtain a precise measurement of the energy dependence of sigma(0) and A(FB)(0) from a model independent fit, enabling constraints to be placed on models with extra Z bosons. (C) 1997 Published by Elsevier Science B.V. RI ANTONELLI, ANTONELLA/C-6238-2011; Jones, Roger/H-5578-2011; Passalacqua, Luca/F-5127-2011; Murtas, Fabrizio/B-5729-2012; St.Denis, Richard/C-8997-2012; Sanchez, Federico/F-5809-2012; Ferrante, Isidoro/F-1017-2012
Titolo: | Study of muon-pair production at centre-of-mass energies from 20 to 136 GeV with the ALEPH detector | |
Autori: | ||
Data di pubblicazione: | 1997 | |
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Digital Object Identifier (DOI): | http://dx.doi.org/10.1016/S0370-2693(97)00353-5 | |
Handle: | http://hdl.handle.net/11384/4924 | |
Appare nelle tipologie: | 1.1 Articolo in rivista |