Effects of next-to-leading order DGLAP evolution on generalized parton distributions of the proton and deeply virtual Compton scattering at high energy

Hamzeh Khanpour; Muhammad Goharipour; Vadim Guzey

doi:10.1140/epjc/s10052-017-5490-5

EPJ

a
b
c
d
e
ap
st
h
plus
ds
pv
ti
qt
am
n

2023 Impact factor 4.2

Particles and Fields

Open Access

Eur. Phys. J. C (2018) 78: 7
https://doi.org/10.1140/epjc/s10052-017-5490-5

Regular Article - Theoretical Physics

Effects of next-to-leading order DGLAP evolution on generalized parton distributions of the proton and deeply virtual Compton scattering at high energy

Hamzeh Khanpour¹^,2, Muhammad Goharipour² and Vadim Guzey³^*

¹ Department of Physics, University of Science and Technology of Mazandaran, P.O.Box 48518-78195, Behshahr, Iran
² School of Particles and Accelerators, Institute for Research in Fundamental Sciences (IPM), P.O.Box 19395-5531, Tehran, Iran
³ National Research Center “Kurchatov Institute”, Petersburg Nuclear Physics Institute (PNPI), Gatchina, 188300, Russia

^* e-mail: guzey_va@pnpi.nrcki.ru

Received: 27 August 2017
Accepted: 19 December 2017
Published online: 4 January 2018

Abstract

We studied the effects of NLO $$Q^2$$ evolution of generalized parton distributions (GPDs) using the aligned-jet model for the singlet quark and gluon GPDs at an initial evolution scale. We found that the skewness ratio for quarks is a slow logarithmic function of $$Q^2$$ , reaching $r^\mathrm{S}=1.5{-}2$ at $$Q^2=100$$ GeV $$^2$$ and $r^\mathrm{g} \approx 1$ for gluons in a wide range of $$Q^2$$ . Using the resulting GPDs, we calculated the DVCS cross section on the proton in NLO pQCD and found that this model in conjunction with modern parameterizations of proton PDFs (CJ15 and CT14) provides a good description of the available H1 and ZEUS data in a wide kinematic range.