Measurement of single top quark production at D0 using a matrix element method [report]

Jovan Pavle Mitrevski
2007 unpublished
Until now, the top quark has only been observed produced in pairs, by the strong force. According to the standard model, it can also be produced singly, via an electroweak interaction. Top quarks produced this way provide powerful ways to test the charged-current electroweak interactions of the top quark, to measure |V tb |, and to search for physics beyond the standard model. This thesis describes the application of the matrix element analysis technique to the search for single top quark
more » ... tion with the D0 detector using 0.9 fb −1 of Run II data. From a comparison of the matrix element discriminants between data and the background model, assuming a Standard Model s-channel to t-channel cross section ratio of σ s /σ t = 0.44, we measure the single top quark production cross section: This result has a p-value of 0.08%, corresponding to a 3.2 standard deviation Gaussian equivalent significance.
doi:10.2172/913191 fatcat:owdh2tg56zhshdopi5ovolgn4i