Abstract
We study the factorization and resummation of -channel top quark transverse momentum distribution at large in the standard model at both the Tevatron and the LHC with soft-collinear effective theory. The cross section in the threshold region can be factorized into a convolution of hard, jet and soft functions. In particular, we first calculate the next-to-leading order soft functions for this process, and give a renormalization group improved cross section by evolving the different functions to a common scale. Our results show that the resummation effects increase the next-to-leading order results by about and when the top quark is larger than 50 and 70 GeV at the Tevatron and the 8 TeV LHC, respectively. Also, we discuss the scale independence of the cross section analytically, and show how to choose the proper scales at which the perturbative expansion can converge fast.
3 More- Received 8 November 2012
DOI:https://doi.org/10.1103/PhysRevD.87.034030
© 2013 American Physical Society