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 t̃ →c/ux, t̃ → bℓṽ,b̃ → bx,q̃ → qx or in the stop four-body decay channel t̃ → bxff̄′ 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/c2 is obtained for the stop mass, at 95% confidence level, irrespective of the stop lifetime and decay branching ratios. © 2002 Elsevier Science B.V. All rights reserved.
|Titolo:||Search for scalar quarks in e(+)e(-) collisions at root s up to 209 GeV|
|Data di pubblicazione:||2002|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1016/S0370-2693(02)01827-0|
|Appare nelle tipologie:||1.1 Articolo in rivista|