Data collected at centre-of-mass energies from 189 GeV to 202 GeV by the ALEPH detector at LEP, corresponding to an integrated luminosity of 411 pb-1, are analysed in a search for the scalar top in the decay channels 'stop -> c/u neutralino' for small mass differences between the stop and the lightest neutralino. No evidence for deviations from the Standard Model expectation is found and a lower limit of 59 GeV/c**2 is set for the stop mass, independent of the stop to neutralino mass difference and of the stop lifetime.
Titolo: | Search for a scalar top almost degenerate with the lightest neutralino in e+ e- collisions at s**(1/2) up to 202-GeV |
Autori: | |
Parole Chiave: | elementary particle physics ; accelerators ; LEP ; standard model |
Settore Scientifico Disciplinare: | Settore FIS/01 - Fisica Sperimentale |
Data di pubblicazione: | 2000 |
Rivista: | |
Tipologia: | Article (author) |
Digital Object Identifier (DOI): | 10.1016/S0370-2693(00)00893-5 |
Appare nelle tipologie: | 01 - Articolo su periodico |
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