Investigationof the np → npπ+π– Reaction at Momenta P0 > 3 GeV/c

IF 0.6 4区 物理与天体物理 Q4 PHYSICS, PARTICLES & FIELDS Physics of Particles and Nuclei Pub Date : 2024-08-18 DOI:10.1134/s1063779624700552
A. P. Ierusalimov, S. G. Arakelyan, A. V. Belyaev, V. P. Ladygin, A. Yu. Troyan
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Abstract

The \(np \to np{{\pi }^{ + }}{{\pi }^{ - }}\) reaction is investigated at the incident neutron momenta \({{P}_{0}}\) = 3.83 and 5.20 GeV/c. Contributions of different diagrams to the reaction cross section are calculated at the momenta from the threshold to 12 GeV/c. It is shown that the main contributions to the \(np \to np{{\pi }^{ + }}{{\pi }^{ - }}\) reaction at momenta above \({{P}_{0}}\) > 3 GeV/c come from diagrams of the reggeized \(\pi \)-meson exchange model (OPER).To study spin effects, the reaction \(np \to np{{\Delta }^{{ + + }}}{{\Delta }^{ - }}\) was separated. It is shown that description of the spin density matrix [\({{\rho }_{{ij}}}\)] requires taking into account the ρ-meson exchange diagram. The reaction \(np \to np{{\rho }^{0}}\) is separated by background subtraction method. The investigation has shown that \({{\rho }^{0}}\)-meson production is described by suspended diagrams of the OPER model.

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对动量 P0 > 3 GeV/c 时 np → npπ+π- 反应的研究
摘要 研究了入射中子矩\({{P}_{0}}\) = 3.83 和 5.20 GeV/c 时的\(np \to np{{{\pi }^{ + }}{{\pi }^{ - }}\) 反应。在从阈值到 12 GeV/c 的时刻,计算了不同图对反应截面的贡献。结果表明,在时刻高于\({{P}_{0}}\) > 3 GeV/c时,对(np \to np{{\pi }^{ + }}{{\pi }^{ - }}\) 反应的主要贡献来自reggeized \(\pi \)-介子交换模型(OPER)的图。为了研究自旋效应,对反应 \(np \to np{{\Delta }^{{ + + }}}{{\Delta }^{ - }}\) 进行了分离。结果表明,描述自旋密度矩阵[\({\rho }_{ij}}\)]需要考虑ρ介子交换图。反应(np \to np{{\rho }^{0}})是通过背景减法分离出来的。研究表明,({{\rho }^{0}}\)-介子产生是由 OPER 模型的悬浮图描述的。
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来源期刊
Physics of Particles and Nuclei
Physics of Particles and Nuclei 物理-物理:粒子与场物理
CiteScore
1.00
自引率
0.00%
发文量
116
审稿时长
6-12 weeks
期刊介绍: The journal Fizika Elementarnykh Chastits i Atomnogo Yadr of the Joint Institute for Nuclear Research (JINR, Dubna) was founded by Academician N.N. Bogolyubov in August 1969. The Editors-in-chief of the journal were Academician N.N. Bogolyubov (1970–1992) and Academician A.M. Baldin (1992–2001). Its English translation, Physics of Particles and Nuclei, appears simultaneously with the original Russian-language edition. Published by leading physicists from the JINR member states, as well as by scientists from other countries, review articles in this journal examine problems of elementary particle physics, nuclear physics, condensed matter physics, experimental data processing, accelerators and related instrumentation ecology and radiology.
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