Evidence for s-channel single top quark production in ppˉ collisions at √s = 1.96 TeV

0424404 - FZÚ 2014 RIV NL eng J - Journal Article
Abazov, V. M. - Abbott, B. - Acharya, B.S. - Kupčo, Alexander - Lokajíček, Miloš … Total 359 authors
Evidence for s-channel single top quark production in ppˉ collisions at √s = 1.96 TeV.
Physics Letters. B. Roč. 726, 4-5 (2013), s. 656-664. ISSN 0370-2693. E-ISSN 1873-2445
R&D Projects: GA MŠMT(CZ) LG12006
Institutional support: RVO:68378271
Keywords : D0 * channel cross section * measured * top * single production * Batavia TEVATRON Coll * CKM matrix * anti-p p * interaction * bottom * associated production
Subject RIV: BG - Nuclear, Atomic and Molecular Physics, Colliders
Impact factor: 6.019, year: 2013
http://www.sciencedirect.com/science/article/pii/S037026931300779X

We present measurements of the cross sections for the two main production modes of single top quarks in ppˉ 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(ppˉ→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(ppˉ→tqb+X)=3.07+0.54−0.49 pb. We also measure the s+t combined cross section as σ(ppˉ→tb+X,tqb+X)=4.11+0.60−0.55 pb and set a lower limit on the CKM matrix element vertical bar V-tb vertical bar> 0.92 at m _t =172 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 x 10(-4), corresponding to a significance of 3.7 standard deviations.
Permanent Link: http://hdl.handle.net/11104/0230467