Lattice study of J/ψ→γηc using a method without momentum extrapolation

IF 5 2区物理与天体物理 Q1 Physics and Astronomy Physical Review D Pub Date : 2025-01-22 DOI:10.1103/physrevd.111.014508

Yu Meng, Chuan Liu, Teng Wang, Haobo Yan

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Abstract

We present a model-independent method to calculate the radiative transition without the momentum extrapolation for the off shell transition factors. The on shell transition factor is directly obtained from the lattice hadronic function. We apply the method to calculate the charmonium radiative transition J/ψ→γηc. After a continuous extrapolation under three lattice spacings, we obtain the on shell transition factor as V(0)=1.90(4), where the error is the statistical error that already takes into account the a2 error in the continuous extrapolation. Finally, we determine the branching fraction of J/ψ→γηc as Br(J/ψ→γηc)=2.49(11)lat(5)exp%, where the second error comes from the uncertainty of J/ψ total decay width 92.6(1.7) keV.

Published by the American Physical Society

2025

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用无动量外推法研究J/ψ→γηc的晶格

我们提出了一种模型无关的方法来计算辐射跃迁，而不需要对壳外跃迁因子进行动量外推。上壳跃迁因子直接由晶格强子函数得到。我们应用该方法计算了氙辐射跃迁J/ψ→γηc。在三个晶格间隔下连续外推后，我们得到上壳跃迁因子为V(0)=1.90(4)，其中误差为连续外推中已经考虑到a2误差的统计误差。最后，我们确定了J/ψ→γηc的分支分数为Br(J/ψ→γηc)=2.49(11)lat(5)exp%，其中第二个误差来自J/ψ总衰变宽度92.6(1.7)keV的不确定度。2025年由美国物理学会出版

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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.