Measurement of the single-top-quark t-channel cross section in pp collisions at sqrt(s) = 7 TeV

Abstract : A measurement of the single-top-quark t-channel production cross section in pp collisions at sqrt(s) = 7 TeV with the CMS detector at the LHC is presented. Two different and complementary approaches have been followed. The first approach exploits the distributions of the pseudorapidity of the recoil jet and reconstructed top-quark mass using background estimates determined from control samples in data. The second approach is based on multivariate analysis techniques that probe the compatibility of the candidate events with the signal. Data have been collected for the muon and electron final states, corresponding to integrated luminosities of 1.17 and 1.56 inverse femtobarns, respectively. The single-top-quark production cross section in the t-channel is measured to be 67.2 +/- 6.1 pb, in agreement with the approximate next-to-next-to-leading-order standard model prediction. Using the standard model assumption that the CKM matrix element abs(V[tb]]) is less than one, we infer the interval 0.92 < abs(V[tb]]) <= 1 at the 95% confidence level.
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Journal articles
Journal of High Energy Physics, Institute of Physics (IOP), 2012, 12, pp.035. <10.1007/JHEP12(2012)035>


http://hal.in2p3.fr/in2p3-00734207
Contributor : Sylvie Florès <>
Submitted on : Friday, September 21, 2012 - 9:00:47 AM
Last modification on : Monday, October 14, 2013 - 11:00:06 AM

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S. Chatrchyan, M. Besancon, S. Choudhury, M. Dejardin, D. Denegri, et al.. Measurement of the single-top-quark t-channel cross section in pp collisions at sqrt(s) = 7 TeV. Journal of High Energy Physics, Institute of Physics (IOP), 2012, 12, pp.035. <10.1007/JHEP12(2012)035>. <in2p3-00734207>

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