Single top quarktW+Xproduction at the CERN LHC: A closer look

We have reexamined the tW+X single top-quark production process which isimportant at the LHC contrary to the Tevatron. The special attention was paidto the treatment of the 2->2[Wt] process and the part of it's next-to-leadingcorrection: 2->3[Wtb] process. We show that 2->3[Wtb] process has to becorrectly taken into account with a proper subtraction of the top paircontribution and that it has qualitatively different kinematical distributionsfrom the 2->2[Wt] process. We present the total cross section of the tW+Xproduction to be about 62 pb at QCD scale be taken as a top quark mass, suggestthe method of combining Wt and Wtb processes with gauge invariant subtractionof the tt-bar part which allows to reproduce correct kinematical properties andperform a proper event simulation of the tW+X process in the whole kinematicalregion.Comment: 8 pages, 4 figure