Cross section measurement of t-channel single top quark production in pp collisions at $\sqrt{s} = 13$ TeV

Abstract

The cross section for the production of single top quarks in the t channel is measured in proton–proton collisions at 13TeV with the CMS detector at the LHC. The analyzed data correspond to an integrated luminosity of $2.2fb^{−1}$. 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.

Abstract

The cross section for the production of single top quarks in the t channel is measured in proton–proton collisions at 13TeV with the CMS detector at the LHC. The analyzed data correspond to an integrated luminosity of $2.2fb^{−1}$. 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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