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.

Search for scalar quarks in e(+)e(-) collisions at root s up to 209 GeV

CREANZA, Donato Maria;DE FILIPPIS, Nicola;IASELLI, Giuseppe;Maggi, Giorgio Pietro;
2002

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 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.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/3571
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