Pion pair production in e+e− annihilation at next-to-leading order matched to Parton Shower

IF 5.4 1区 物理与天体物理 Q1 Physics and Astronomy
Ettore Budassi, Carlo M. Carloni Calame, Marco Ghilardi, Andrea Gurgone, Guido Montagna, Mauro Moretti, Oreste Nicrosini, Fulvio Piccinini, Francesco P. Ucci
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Abstract

The pion pair production in e+e annihilation at flavour factories plays a crucial role in the determination of the hadronic contribution to the muon anomalous magnetic moment. The recent CMD-3 measurement of the pion form factor via energy scan displays a significant difference with the previous experimental determinations. In order to contribute to an improved theoretical description and simulation of energy scan experiments, we present a calculation of the e+eπ+π(γ) hadronic channel at next-to-leading order matched to a Parton Shower algorithm in QED and sQED. According to the recent advances in the literature, particular attention is paid to the treatment of the pion composite structure in loop diagrams beyond the commonly used factorised sQED approach, as well as to the modelling of multiple photon radiation through the Parton Shower algorithm. In particular, we carry out a detailed discussion on the inclusion of the pion form factor in the virtual sQED corrections according to two independent methods, inspired by the generalised vector meson dominance model and the dispersive approach, respectively. We find the two methods to be in remarkable agreement. We show phenomenological results for inclusive and differential observables which are relevant for precision energy scan measurements, focusing on the impact of the radiative corrections and the effect of the various approaches for the treatment of the pion form factor. Our calculation is implemented in an updated version of the Monte Carlo event generator BabaYaga@NLO, that can be used for fully exclusive simulations in data analysis.

次序e+e−湮灭的介子对产生与Parton Shower相匹配
风味工厂e+e−湮灭过程中介子对的产生在确定强子对μ子异常磁矩的贡献中起着至关重要的作用。最近通过能量扫描对介子形状因子的cd -3测量显示与以前的实验测定有显着差异。为了改进能量扫描实验的理论描述和模拟,我们提出了与QED和sQED中Parton Shower算法相匹配的次领先阶e+e−→π+π−(γ)强子通道的计算。根据文献的最新进展,特别关注了在环图中处理介子复合结构的方法,而不是常用的因式sQED方法,以及通过Parton Shower算法对多光子辐射的建模。特别地,我们根据两种独立的方法,分别由广义矢量介子优势模型和色散方法启发,详细讨论了介子形式因子在虚sQED校正中的包含。我们发现这两种方法非常一致。我们展示了与精确能量扫描测量相关的包容性和微分可观测值的现象学结果,重点关注辐射修正的影响以及处理介子形状因子的各种方法的影响。我们的计算是在Monte Carlo事件生成器BabaYaga@NLO的更新版本中实现的,该生成器可用于数据分析中的完全独占模拟。
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
Journal of High Energy Physics
Journal of High Energy Physics 物理-物理:粒子与场物理
CiteScore
10.30
自引率
46.30%
发文量
2107
审稿时长
1.5 months
期刊介绍: The aim of the Journal of High Energy Physics (JHEP) is to ensure fast and efficient online publication tools to the scientific community, while keeping that community in charge of every aspect of the peer-review and publication process in order to ensure the highest quality standards in the journal. Consequently, the Advisory and Editorial Boards, composed of distinguished, active scientists in the field, jointly establish with the Scientific Director the journal''s scientific policy and ensure the scientific quality of accepted articles. JHEP presently encompasses the following areas of theoretical and experimental physics: Collider Physics Underground and Large Array Physics Quantum Field Theory Gauge Field Theories Symmetries String and Brane Theory General Relativity and Gravitation Supersymmetry Mathematical Methods of Physics Mostly Solvable Models Astroparticles Statistical Field Theories Mostly Weak Interactions Mostly Strong Interactions Quantum Field Theory (phenomenology) Strings and Branes Phenomenological Aspects of Supersymmetry Mostly Strong Interactions (phenomenology).
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