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Evidence for s-channel single top quark production in $p\bar{p}$ collisions at sqrt(s) = 1.96 TeV

Abstract : We present measurements of the cross sections for the two main production modes of single top quarks in $p\bar{p}$ collisions at $\sqrt{s} = 1.96$\;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 $\sigma({\ppbar}{\rargap}tb+X) = 1.10^{+0.33}_{-0.31}$\;pb with no assumptions on the value of the t-channel cross section. Similarly, the t-channel cross section is measured to be $\sigma({\ppbar}{\rargap}tqb+X) = 3.07^{+0.54}_{-0.49}$\;pb. We also measure the $s+t$ combined cross section as $\sigma({\ppbar}{\rargap}tb+X, tqb+X) = 4.11^{+0.60}_{-0.55}$\;pb and set a lower limit on the CKM matrix element $|V_{tb}| > 0.92 at 95% C.L., assuming $m_t=172.5$\;GeV. The probability to measure a cross section for the s channel at the observed value or higher in the absence of signal is $1.0\times 10^{-4}$, corresponding to a significance of 3.7 standard deviations.
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http://hal.in2p3.fr/in2p3-00841389
Contributor : Emmanuelle Vernay <>
Submitted on : Thursday, July 4, 2013 - 4:26:50 PM
Last modification on : Friday, December 4, 2020 - 1:22:02 PM

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V.M. Abazov, G. Sajot, J. Stark, S. Greder, F. Miconi, et al.. Evidence for s-channel single top quark production in $p\bar{p}$ collisions at sqrt(s) = 1.96 TeV. Physics Letters B, Elsevier, 2013, B726, pp.656-664. ⟨10.1016/j.physletb.2013.09.048⟩. ⟨in2p3-00841389⟩

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