Titel
Threshold factorization of the Drell-Yan quark-gluon channel and two-loop soft function at next-to-leading power
Autor*in
Leonardo Vernazza
INFN, Sezione di Torino and Dipartimento di Fisica Teorica, Università di Torino
Abstract
We present a factorization theorem of the partonic Drell-Yan off-diagonal processes gq¯ (qg) → γ∗+ X in the kinematic threshold regime z= Q2/ ŝ → 1 at general subleading powers in the (1 − z) expansion. Focusing on the first order of the expansion (next-to-leading power accuracy with respect to the leading power qq¯ channel), we validate the bare factorization formula up to O(αs2) . This is achieved by carrying out an explicit calculation of the generalized soft function in d-dimensions using the reduction to master integrals and the differential equations method. The collinear function is a universal object which we compute from an operator matching equation at one-loop level. Next, we integrate the soft and collinear functions over the convolution variables and remove the remaining initial state collinear singularities through PDF renormalization. The resulting expression agrees with the known cross section in the literature.
Stichwort
Effective Field Theories of QCDFactorizationRenormalization GroupHigher-Order Perturbative CalculationsResummation
Objekt-Typ
Sprache
Englisch [eng]
Persistent identifier
phaidra.univie.ac.at/o:2070544
Erschienen in
Titel
Journal of High Energy Physics
Band
2023
Ausgabe
12
ISSN
1029-8479
Erscheinungsdatum
2023
Publication
Springer Science and Business Media LLC
Fördergeber
Erscheinungsdatum
2023
Zugänglichkeit
Rechte
Rechteangabe
© The Authors
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