We assess and compare different methods for including leading threshold logarithms at next-to-leading-power in prompt photon production at hadron colliders, for both the direct and parton fragmentation mechanisms. We do this in addition to next-to-leading logarithmic threshold and joint resummation at leading power. We study the size of these effects and their scale variations for LHC kinematics. We find that the next-to-leading power effects have a noticeable effect on the photon transverse momentum distribution, typically of order O(10%), depending on the method of inclusion. Our results indicate that next-to-leading power terms can reduce the scale dependence of the distribution considerably.
@article{arxiv.1905.11771,
title = {Next-to-leading power threshold effects for resummed prompt photon production},
author = {Melissa van Beekveld and Wim Beenakker and Rahul Basu and Eric Laenen and Anuradha Misra and Patrick Motylinski},
journal= {arXiv preprint arXiv:1905.11771},
year = {2019}
}
Comments
We dedicate this paper to the memory of Rahul Basu