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Evidence for s-channel single top quark production in pp¯ collisions at s=1.96 TeV

Research output: Contribution to journalJournal article

  • D0 Collaboration
<mark>Journal publication date</mark>4/11/2013
<mark>Journal</mark>Physics Letters B
Issue number4-5
Number of pages9
Pages (from-to)656-664
<mark>Original language</mark>English


We present measurements of the cross sections for the two main production modes of single top quarks
in pp¯ collisions at √s = 1.96 TeV in the Run II data collected with the D0 detector at the Fermilab
Tevatron Collider, corresponding to an integrated luminosity of 9.7 fb−1. The s-channel cross section is
measured to be σ(pp¯ →tb+ X)=1.10+0.33
−0.31 pb with no assumptions on the value of the t-channel cross
section. Similarly, the t-channel cross section is measured to be σ(pp¯ →tqb + X) = 3.07+0.54
−0.49 pb. We
also measure the s+t combined cross section as σ(pp¯ →tb+X,tqb+X)=4.11+0.60
−0.55 pb and set a lower
limit on the CKM matrix element |Vtb|>0.92 at 95% C.L., assuming mt =172.5 GeV. The probability to
measure a cross section for the s channel at the observed value or higher in the absence of signal is
1.0×10−4, corresponding to a significance of 3.7 standard deviations.