Abstract
We present measurements of the cross sections for the two main production modes of single top quarks in pp¯ 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(pp¯→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 σ(pp¯→tqb+X)=3.07−0.49+0.54 pb. We also measure the s+t combined cross section as σ(pp¯→tb+X,tqb+X)=4.11−0.55+0.60 pb and set a lower limit on the CKM matrix element |Vtb|>0.92 at 95% C.L., assuming mt=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 1.0×10−4, corresponding to a significance of 3.7 standard deviations.
Highlights
11LPSC, Universite Joseph Fourier Grenoble 1, CNRS/IN2P3, Institut National Polytechnique de Grenoble, Grenoble, France 12CPPM, Aix-Marseille Universite, CNRS/IN2P3, Marseille, France
We present measurements o√f the cross sections for the two main production modes of single top quarks in ppcollisions at s = 1.96 TeV in the Run II data collected with the D0 detector at the Fermilab Tevatron Collider
they are also produced by the electroweak interaction in three different production modes
Summary
Other affecting both the normalization and the kinematic distributions and the discriminant distributions. We assume a Poisson distribution for the number of events in each bin and uniform prior probabilities for positive values of the signal cross sections. Systematic uncertainties and their correlations are taken into account by integrating over signal acceptances, background yields, and integrated luminosity, assuming a Gaussian prior for each source of systematic uncertainty. A two-dimensional (2D) posterior probability density is constructed as a function of σs and σt, with the position of the maximum defining the value of the cross sections, and the width of the distribution in the minimal region that encompasses 68% of the entire area defining the uncertainty (statistical and systematic components combined). The expected cross sections are obtained by setting the number of data events in each channel equal to the value given by the prediction of SM signal plus background
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