the three-loop splitting functions pqg(2) and pgg(2,nf)
;J. Ablinger;A. Behring;J. Blümlein;A. De Freitas;A. von Manteuffel;C. Schneider
biology and fertility of soils2017Vol. 922pp. 1-40
175
ablinger2017nuclearthe
Abstract
We calculate the unpolarized twist-2 three-loop splitting functions Pqg(2)(x) and Pgg(2,NF)(x) and the associated anomalous dimensions using massive three-loop operator matrix elements. While we calculate Pgg(2,NF)(x) directly, Pqg(2)(x) is computed from 1200 even moments, without any structural prejudice, using a hierarchy of recurrences obtained for the corresponding operator matrix element. The largest recurrence to be solved is of order 12 and degree 191. We confirm results in the foregoing literature.