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 $\sigma (p\bar{p}\to tb+X)=1.10_{-0.31}^{+0.33}$ pb with no assumptions on the value of the t-channel cross section. Similarly, the t-channel cross section is measured to be $\sigma (p\bar{p}\to tqb+X)=3.07_{-0.49}^{+0.54}$ pb. We also measure the $s+t$ combined cross section as $\sigma (p\bar{p}\to tb+X,tqb+X)=4.11_{-0.55}^{+0.60}$ 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.

Version to be published by Phys. Lett. B. 12 pages, 4 figures

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