Perturbative results for the matrix elements of the vector current and the role of different infrared regulators

Alessio Carmelo Alvaro; Ignacio Castelli; Cédric Lorcé; Andreas Metz; Barbara Pasquini; Simone Rodini

doi:10.1016/j.physletb.2026.140501

Perturbative results for the matrix elements of the vector current and the role of different infrared regulators

Alessio Carmelo Alvaro
, Ignacio Castelli
, Cédric Lorcé
, Andreas Metz
, Barbara Pasquini
, Simone Rodini

University of Pavia
INFN Sezione di Pavia
Temple University

Research output: Contribution to journal › Article › peer-review

Abstract

We investigate the twist-2 unpolarized generalized parton distributions (GPDs) of quarks for an on-shell gluon target in quantum chromodynamics. These GPDs parametrize the leading-twist matrix elements of the nonlocal light-like flavor-singlet vector current. We compute them at one-loop accuracy in perturbation theory using a quark mass and dimensional regularization as infrared regulators. In particular, we discuss the limit of vanishing momentum transfer. The present work extends our previous related study on the axial current.

Original language	English
Article number	140501
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	878
DOIs	https://doi.org/10.1016/j.physletb.2026.140501
Publication status	Published - 1 Jul 2026

Keywords

Generalized parton distributions
Perturbative QCD

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10.1016/j.physletb.2026.140501

Cite this

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title = "Perturbative results for the matrix elements of the vector current and the role of different infrared regulators",

abstract = "We investigate the twist-2 unpolarized generalized parton distributions (GPDs) of quarks for an on-shell gluon target in quantum chromodynamics. These GPDs parametrize the leading-twist matrix elements of the nonlocal light-like flavor-singlet vector current. We compute them at one-loop accuracy in perturbation theory using a quark mass and dimensional regularization as infrared regulators. In particular, we discuss the limit of vanishing momentum transfer. The present work extends our previous related study on the axial current.",

keywords = "Generalized parton distributions, Perturbative QCD",

author = "Alvaro, \{Alessio Carmelo\} and Ignacio Castelli and C{\'e}dric Lorc{\'e} and Andreas Metz and Barbara Pasquini and Simone Rodini",

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T1 - Perturbative results for the matrix elements of the vector current and the role of different infrared regulators

AU - Alvaro, Alessio Carmelo

AU - Castelli, Ignacio

AU - Lorcé, Cédric

AU - Metz, Andreas

AU - Pasquini, Barbara

AU - Rodini, Simone

PY - 2026/7/1

Y1 - 2026/7/1

N2 - We investigate the twist-2 unpolarized generalized parton distributions (GPDs) of quarks for an on-shell gluon target in quantum chromodynamics. These GPDs parametrize the leading-twist matrix elements of the nonlocal light-like flavor-singlet vector current. We compute them at one-loop accuracy in perturbation theory using a quark mass and dimensional regularization as infrared regulators. In particular, we discuss the limit of vanishing momentum transfer. The present work extends our previous related study on the axial current.

AB - We investigate the twist-2 unpolarized generalized parton distributions (GPDs) of quarks for an on-shell gluon target in quantum chromodynamics. These GPDs parametrize the leading-twist matrix elements of the nonlocal light-like flavor-singlet vector current. We compute them at one-loop accuracy in perturbation theory using a quark mass and dimensional regularization as infrared regulators. In particular, we discuss the limit of vanishing momentum transfer. The present work extends our previous related study on the axial current.

KW - Generalized parton distributions

KW - Perturbative QCD

UR - https://www.scopus.com/pages/publications/105038624905

U2 - 10.1016/j.physletb.2026.140501

DO - 10.1016/j.physletb.2026.140501

M3 - Article

AN - SCOPUS:105038624905

SN - 0370-2693

VL - 878

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

M1 - 140501

ER -

Perturbative results for the matrix elements of the vector current and the role of different infrared regulators

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Keywords

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