The data collected at centre-of-mass energies of 188.6 GeV by ALEPH at LEP, corresponding to an integrated luminosity of 176.2 pb(-1), are analysed in a search for pair-produced charged Hi,ags bosons H +/-. Three analyses are employed to select the tau(+)7 nu(tau)tau(-)<(nu)over bar>tau, c (s) over bar tau(-)<(nu)over bar>(tau) and c (s) over bar s (c) over bar final states. No evidence for a signal is found. Upper limits are set on the production cross section as a function of the branching fraction B(H+--> tau(+)nu(tau)) and of the mass m(H+/-), assuming that the sum of the branching ratios is equal to one. In the framework of a two-Higgs-doublet model, charged Higgs bosons with masses below 65.4 GeV/c(2) are excluded at 95% confidence level independently of the decay mode. (C) 2000 Published by Elsevier Science B.V.
Titolo: | Search for charged Higgs bosons in e(+)e(-) collisions at energies up to root s=189 GeV | |
Autori: | ||
Data di pubblicazione: | 2000 | |
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Digital Object Identifier (DOI): | http://dx.doi.org/10.1016/S0370-2693(00)00822-4 | |
Handle: | http://hdl.handle.net/11384/5428 | |
Appare nelle tipologie: | 1.1 Articolo in rivista |