Anomalous dimensions of the double parton fragmentation functions

Abstract

Double parton fragmentation is a process in which a pair of partons produced in the short-distance process hadronize into the final state hadron. This process is important for quarkonium production when the transverse momentum is much greater than the quark mass. Resummation of logarithms of the ratio of these two scales requires the evolution equations for double parton fragmentation functions (DPFF). In this paper we complete the one-loop evaluation of the anomalous dimensions for the DPFF. We also consider possible mixing between the DPFF and single parton power suppressed gluon fragmentation and show that such effects are sub-leading.

Figures (2)

• Figure 1: The one-loop diagrams required for computing the evolution of the DPFF. Not shown are the diagrams which are mirror images with respect to the horizontal and/or vertical axes.
• Figure 2: Possible mixings between single and double parton fragmentation functions.