Twist-3 contribution to deeply virtual electroduction of pions

Passek-Kumerički, Kornelija (2024) Twist-3 contribution to deeply virtual electroduction of pions. Proceedings of Science, 477 . ISSN 1824-8039

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Abstract

We discuss deeply virtual meson production (DVMP), focusing on the role of higher-twist contributions in the description of deeply virtual pseudoscalar mesons at experimentally accessible energies. The standard collinear approach at the lowest twist does not adequately describe deeply virtual π0 production. By incorporating twist-2 transversity generalized parton distributions (GPDs) and a twist-3 meson distribution amplitude, we have determined the twist-3 contribution, which includes both the 2-body (qq¯) and 3-body (qq¯g) meson Fock components. Two methods to regularize the end-point singularities are introduced - quark transverse momenta and a gluon mass. The resulting cross sections show good agreement with experimental data, paving the way for a more comprehensive confrontation of theory and experiment at leading order and beyond.

Item Type:	Article
Uncontrolled Keywords:	generalized parton distributions; deeply virtual meson production; higher-twist
Subjects:	NATURAL SCIENCES > Physics > Physics of Elementary Particles and Fields
Divisions:	Theoretical Physics Division
Depositing User:	Kornelija Passek-Kumerički
Date Deposited:	05 Feb 2025 10:43
URI:	http://fulir.irb.hr/id/eprint/9545
DOI:	10.22323/1.477.0042

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