Constant terms in threshold resummation and the quark form factor
High Energy Physics - Phenomenology
2010-02-03 v3
Abstract
We verify to order alpha_s^4 two previously conjectured relations, valid in four dimensions, between constant terms in threshold resummation (for Deep Inelastic Scattering and the Drell-Yan process) and the second logarithmic derivative of the massless quark form factor. The same relations are checked to all orders in the large beta_0 limit; as a byproduct a dispersive representation of the form factor is obtained. These relations allow to compute in a symmetrical way the three-loop resummation coefficients B_3 and D_3 in terms of the three-loop contributions to the virtual diagonal splitting function and to the quark form factor, confirming results obtained in the literature.
Keywords
Cite
@article{arxiv.0706.1206,
title = {Constant terms in threshold resummation and the quark form factor},
author = {S. Friot and G. Grunberg},
journal= {arXiv preprint arXiv:0706.1206},
year = {2010}
}