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Search for scalar quarks in $e^+ e^-$ collisions at $s$ up to 209-GeV

Research output: Contribution to journalJournal articlepeer-review

<mark>Journal publication date</mark>13/06/2002
<mark>Journal</mark>Physics Letters B
Issue number1-2
Number of pages16
Pages (from-to)5-20
Publication StatusPublished
<mark>Original language</mark>English


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 , , , or in the stop four-body decay channel 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.