Constant terms in threshold resummation and the quark form factor

TL;DR

This paper verifies conjectured relations between constant terms in threshold resummation and the quark form factor up to order alpha_s^4, confirming their validity and providing a dispersive representation.

Contribution

It confirms conjectured relations between resummation constants and the quark form factor to four loops and derives a dispersive representation of the form factor.

Findings

Verified relations at order alpha_s^4 for DIS and Drell-Yan

Checked relations to all orders in large beta_0 limit

Derived dispersive representation of the quark form factor

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.