Cross section measurement of t-channel single top quark production in pp collisions at <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:msqrt><mml:mi>s</mml:mi></mml:msqrt><mml:mo>=</mml:mo><mml:mn>13</mml:mn><mml:mspace width="0.2em"/><mml:mtext>TeV</mml:mtext></mml:math>
Аннотация
The cross section for the production of single top quarks in the t channel is measured in proton-proton collisions at 13 TeV with the CMS detector at the LHC. The analyzed data correspond to an integrated luminosity of 2.2 fb -1 . The event selection requires one muon and two jets where one of the jets is identified as originating from a bottom quark. Several kinematic variables are then combined into a multivariate discriminator to distinguish signal from background events. A fit to the distribution of the discriminating variable yields a total cross section of 238 13 (stat) 29 (syst) pb and a ratio of top quark and top antiquark production of R t-ch. = 1.81 0.18 (stat) 0.15 (syst). From the total cross section the absolute value of the CKM matrix element V tb is calculated to be 1.05 0.07 (exp) 0.02 (theo). All results are in agreement with the standard model predictions.
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