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arXiv 2406.08016hep-phhep-ex
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研究超越 Pomeron 交换的 $π^+π^-$ 光生过程

Studying $π^+π^-$ photoproduction beyond Pomeron exchange

Łukasz Bibrzycki, Nadine Hammoud, Vincent Mathieu, Robert J. Perry, Alex Akridge, César Fernández-Ramírez, Gloria Montaña, Alessandro Pilloni, Arkaitz Rodas, Va… 展开作者

Łukasz Bibrzycki, Nadine Hammoud, Vincent Mathieu, Robert J. Perry, Alex Akridge, César Fernández-Ramírez, Gloria Montaña, Alessandro Pilloni, Arkaitz Rodas, Vanamali Shastry, Wyatt A. Smith, Daniel Winney, Adam P. Szczepaniak

AI总结:

通过分析 CLAS 数据,本文提出纳入双 π 与 π-核子共振贡献的新模型,弥补 Pomeron 交换在大 $|t|$ 区域的不足。

摘要:

不变质量约为 $m_ρ\sim 770$ MeV 的 $π^+π^-$ 对的前向光生,传统上被理解为通过 Pomeron 交换产生。基于对 CLAS 光生数据的详细分析,本文表明,在 $|t|\gtrsim 0.5$ GeV$^2$ 时,双 π 光生的动力学不能仅由 Pomeron 交换解释。这促使我们发展一种新的双 π 光生理论模型,该模型同时纳入双 π 和 π-核子共振贡献。在对自由参数进行拟合后,该模型出色地描述了在 CLAS 测得的角分布低阶矩,并能够评估特定产生机制的相对贡献,以及依据这些机制解释数据的各种特征。

英文摘要:

Forward photoproduction of $π^+π^-$ pairs with invariant mass of the order of $m_ρ\sim 770$ MeV is traditionally understood to be produced via Pomeron exchange. Based on a detailed analysis of the CLAS photoproduction data, it is shown that the dynamics of two-pion photoproduction for $|t|\gtrsim 0.5$ GeV$^2$ cannot be explained by Pomeron exchange alone. This motivates the development of a new theoretical model of two-pion photoproduction which incorporates both two-pion and pion-nucleon resonant contributions. After fitting free parameters, the model provides an excellent description of the low moments of the angular distribution measured at CLAS, and enables an assessment of the relative contributions of particular production mechanisms and an interpretation of the various features of the data in terms of these mechanisms.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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