广角介子- Δ（1232）光电生产

IF 5 2区物理与天体物理 Q1 Physics and Astronomy

Physical Review D Pub Date : 2025-05-05 DOI:10.1103/physrevd.111.094003

P. Kroll

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引用次数: 0

摘要

高能广角光生产πΔ最终状态进行了研究，以扭转-3精度的手提袋机制。在这种方法中，过程振幅分解为一个硬部分子过程和形式因子，表示p−Δ跃迁广义部分分布（gpd）在零偏度下的1/x矩。子过程，计算到扭转-3精度，是相同的介子光生产。p−Δ gpd与利用大nc结果的质子-质子gpd有关。子过程中出现的质子-质子gpd以及扭转-2和扭转-3介子分布振幅取自其他工作。该分析结果与实验结果基本一致。2025年由美国物理学会出版

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Wide-angle pion- Δ(1232) photoproduction

High-energy wide-angle photoproduction of πΔ final states is investigated within the handbag mechanism to twist-3 accuracy. In this approach the process amplitudes factorize in a hard partonic subprocess and in form factors which represent 1/x-moments of p−Δ transition generalized parton distributions (GPDs) at zero skewness. The subprocess, calculated to twist-3 accuracy, is the same as in pion photoproduction. The p−Δ GPDs are related to the proton-proton GPDs exploiting large-NC results. The proton-proton GPDs as well as the twist-2 and twist-3 pion distribution amplitudes appearing in the subprocess are taken from other work. Reasonable agreement with experiment is found in this almost parameter-free analysis.

Published by the American Physical Society

2025

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来源期刊

Physical Review D 物理-天文与天体物理

CiteScore

9.20

自引率

36.00%

发文量

审稿时长

2 months

期刊介绍： Physical Review D (PRD) is a leading journal in elementary particle physics, field theory, gravitation, and cosmology and is one of the top-cited journals in high-energy physics. PRD covers experimental and theoretical results in all aspects of particle physics, field theory, gravitation and cosmology, including: Particle physics experiments, Electroweak interactions, Strong interactions, Lattice field theories, lattice QCD, Beyond the standard model physics, Phenomenological aspects of field theory, general methods, Gravity, cosmology, cosmic rays, Astrophysics and astroparticle physics, General relativity, Formal aspects of field theory, field theory in curved space, String theory, quantum gravity, gauge/gravity duality.