Timelike Compton scattering on a spin-0 target with kinematic twist-4 precision

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

Physical Review D Pub Date : 2025-04-28 DOI:10.1103/physrevd.111.074034

V. Martínez-Fernández, B. Pire, P. Sznajder, J. Wagner

引用次数: 0

Abstract

We calculate the kinematic twist-3 and twist-4 corrections to the leading-order amplitude of timelike Compton scattering (TCS) on a (pseudo)scalar target, in the recently developed framework based on the conformal operator-product expansion. This allows us to compute the complete set of helicity amplitudes of the process, in particular those that vanish at leading twist. We compare the effects of higher-twist contributions to TCS with those in deeply virtual Compton scattering. Our estimates, based on a π-meson GPD model, indicate that these contributions are sizeable and will play a crucial role in the interpretation of data from current and forthcoming experiments.

Published by the American Physical Society

2025

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旋转为0、运动扭转精度为4的目标上的类时康普顿散射

在最近提出的基于共形算子积展开的框架中，我们计算了（伪）标量目标上的类时康普顿散射（TCS）的运动学扭转-3和扭转-4对前阶振幅的修正。这使我们能够计算出整个过程的螺旋振幅，特别是那些在前导扭转时消失的螺旋振幅。我们比较了高扭转对TCS的贡献与深度虚康普顿散射的影响。我们基于π介子GPD模型的估计表明，这些贡献是相当大的，并且将在解释当前和即将进行的实验数据中发挥关键作用。2025年由美国物理学会出版

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.