Searches for scalar top, scalar bottom and mass-degenerate scalar quarks are performed in the data collected by the ALEPH detector at LEP. at centre-of-mass energies up to 209 GeV, corresponding to an integrated luminosity of 675 pb(-1). No evidence for the production of such particles is found in the decay channels (t) over tilde -->C/uchi, (t) over tilde -->bl (nu) over tilde, (q) over tilde -->bchi, ($) over tilde -->qchi or in the stop four-body decay channel (t) over tilde -->bchif (f) over bar' studied for the first time at LEP. The results of these searches yield improved mass lower limits. In particular, an absolute lower limit of 63 GeV/c(2) is obtained for the stop mass, at 95% confidence level, irrespective of the stop lifetime and decay branching ratios. (C) 2002 Elsevier Science B.V All rights reserved.
Search for scalar quarks in e(+)e(-) collisions at root s up to 209 GeV
SELVAGGI, Giovanna;DE PALMA, Mauro;NUZZO, Salvatore Vitale
2002-01-01
Abstract
Searches for scalar top, scalar bottom and mass-degenerate scalar quarks are performed in the data collected by the ALEPH detector at LEP. at centre-of-mass energies up to 209 GeV, corresponding to an integrated luminosity of 675 pb(-1). No evidence for the production of such particles is found in the decay channels (t) over tilde -->C/uchi, (t) over tilde -->bl (nu) over tilde, (q) over tilde -->bchi, ($) over tilde -->qchi or in the stop four-body decay channel (t) over tilde -->bchif (f) over bar' studied for the first time at LEP. The results of these searches yield improved mass lower limits. In particular, an absolute lower limit of 63 GeV/c(2) is obtained for the stop mass, at 95% confidence level, irrespective of the stop lifetime and decay branching ratios. (C) 2002 Elsevier Science B.V All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
