运动功率修正深度虚拟康普顿散射到扭转六精度

IF 5.3 2区物理与天体物理 Q1 Physics and Astronomy

Physical Review D Pub Date : 2025-04-14 DOI:10.1103/physrevd.111.076011

V. M. Braun, Yao Ji, A. N. Manashov

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We find that the power expansion is well convergent up to <o:math xmlns:o=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><o:mo stretchy=\"false\">|</o:mo><o:mi>t</o:mi><o:mo stretchy=\"false\">|</o:mo><o:mo>/</o:mo><o:msup><o:mi>Q</o:mi><o:mn>2</o:mn></o:msup><o:mo>≲</o:mo><o:mn>1</o:mn><o:mo>/</o:mo><o:mn>4</o:mn></o:math> for most of the observables, but is naturally organized in terms of <s:math xmlns:s=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><s:mn>1</s:mn><s:mo>/</s:mo><s:mo stretchy=\"false\">(</s:mo><s:msup><s:mi>Q</s:mi><s:mn>2</s:mn></s:msup><s:mo>+</s:mo><s:mi>t</s:mi><s:mo stretchy=\"false\">)</s:mo></s:math> rather than the nominal hard scale <w:math xmlns:w=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><w:mn>1</w:mn><w:mo>/</w:mo><w:msup><w:mi>Q</w:mi><w:mn>2</w:mn></w:msup></w:math>. We also argue that target mass corrections remain under control and do not endanger quantum chromodynamics (QCD) factorization for coherent DVCS on nuclei. These results remove an important source of uncertainties due to the frame dependence and violation of electromagnetic Ward identities in the QCD predictions for the DVCS amplitudes in the leading-twist approximation. Published by the American Physical Society 2025 ","PeriodicalId":20167,"journal":{"name":"Physical Review D","volume":"183 1","pages":""},"PeriodicalIF":5.3000,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Kinematic power corrections to deeply virtual Compton scattering to twist-six accuracy\",\"authors\":\"V. M. Braun, Yao Ji, A. N. 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引用次数: 0

摘要

我们计算了深度虚康普顿散射（DVCS）中几个关键观测值在k≤4时的（- t/Q）k和（m/Q）k功率修正，其中m为目标质量，t为动量传递。我们发现，对于大多数可观测值，幂展开式可以很好地收敛到|/Q2 > 1/4，但自然地以1/(Q2+t)而不是名义上的硬尺度1/Q2组织。我们还认为目标质量修正仍然在控制之下，并且不会危及核上相干DVCS的量子色动力学（QCD）分解。这些结果消除了一个重要的不确定性来源，这是由于前导扭转近似中对DVCS振幅的QCD预测中的坐标系依赖和电磁沃德恒等的违反。2025年由美国物理学会出版

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Kinematic power corrections to deeply virtual Compton scattering to twist-six accuracy

We calculate (−t/Q)k and (m/Q)k power corrections with k≤4, where m is the target mass and t is the momentum transfer, to several key observables in deeply virtual Compton scattering (DVCS). We find that the power expansion is well convergent up to |t|/Q2≲1/4 for most of the observables, but is naturally organized in terms of 1/(Q2+t) rather than the nominal hard scale 1/Q2. We also argue that target mass corrections remain under control and do not endanger quantum chromodynamics (QCD) factorization for coherent DVCS on nuclei. These results remove an important source of uncertainties due to the frame dependence and violation of electromagnetic Ward identities in the QCD predictions for the DVCS amplitudes in the leading-twist approximation.

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.