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Search for single top production in $e^+ e^-$ collisions at $s$ up to 209-GeV

Research output: Contribution to journalJournal article


<mark>Journal publication date</mark>12/09/2002
<mark>Journal</mark>Physics Letters B
Issue number3-4
Number of pages10
Pages (from-to)173-182
<mark>Original language</mark>English


Single top production via the flavour changing neutral current reactions is searched for within the 214 pb−1 of data collected by ALEPH at centre-of-mass energies between 204 and 209 GeV. No deviation from the Standard Model expectation is observed and upper limits on the single top production cross sections are derived. The combination with data collected at lower centre-of-mass energies yields an upper limit on the branching ratio BR(t→Zc)+BR(t→Zu)<14%, for BR(t→γc)+BR(t→γu)=0 and mt=174 GeV/c2.