Studies of η-Meson Two-Photon Production with the SND Detector at the e+e– Collider VEPP2000

IF 0.4 Q4 PHYSICS, PARTICLES & FIELDS

Physics of Particles and Nuclei Letters Pub Date : 2025-04-23 DOI:10.1134/S1547477124702066

M. N. Achasov, A. Yu. Barnyakov, K. I. Beloborodov, A. V. Berdyugin, D. E. Berkaev, A. G. Bogdanchikov, A. A. Botov, E. I. Grigoruk, T. V. Dimova, V. P. Druzhinin, V. N. Zhabin, L. V. Kardapoltsev, D. P. Kovrizhin, I. A. Koop, A. A. Korol, A. S. Kupich, A. P. Kryukov, N. A. Melnikova, N. Yu. Muchnoy, A. E. Obrazovsky, E. V. Pakhtusova, M. I. Petrova, K. V. Pugachev, Yu. A. Rogovsky, S. I. Serednyakov, Z. K. Silagadze, I. K. Surin, Yu. V. Usov, A. G. Kharlamov, Yu. M. Shatunov, V. D. Shrainer, D. A. Shtol

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Abstract

We present the preliminary measurement of the two-photon η-meson production cross section: \({{e}^{ + }}{{e}^{ - }} \to {{e}^{ + }}{{e}^{ - }}\eta (550)\). The measurements were carried out by the SND detector at the VEPP-2000 collider in the energy range from 1 to 2 GeV, the integral luminosity of the order of 0.5 fb^–1 was used. The η-meson was detected at the six-photon final state, without scattered electrons registration. From the cross section of this process, we extract the two-photon η-meson width. The experimental results obtained can be used to calculate the hadronic contribution to the light by light scattering and to interpret the results of the muon anomalous magnetic moment measurement’s and to calculate the electromagnetic interaction constant at Z boson mass scale.

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e+e对撞机VEPP2000上SND探测器产生η介子双光子的研究

我们给出了双光子η-介子产生截面的初步测量结果：\({{e}^{ + }}{{e}^{ - }} \to {{e}^{ + }}{{e}^{ - }}\eta (550)\)。在VEPP-2000对撞机上用SND探测器在1 ～ 2 GeV能量范围内进行了测量，积分光度为0.5 fb-1量级。在六光子终态检测到η介子，没有散射电子注册。从这一过程的横截面中，我们提取了双光子的η-介子宽度。所得实验结果可用于计算强子对光散射的贡献，解释μ子异常磁矩测量结果，计算Z玻色子质量尺度上的电磁相互作用常数。

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

Physics of Particles and Nuclei Letters PHYSICS, PARTICLES & FIELDS-

CiteScore

0.80

自引率

20.00%

发文量

108

期刊介绍： The journal Physics of Particles and Nuclei Letters, brief name Particles and Nuclei Letters, publishes the articles with results of the original theoretical, experimental, scientific-technical, methodological and applied research. Subject matter of articles covers: theoretical physics, elementary particle physics, relativistic nuclear physics, nuclear physics and related problems in other branches of physics, neutron physics, condensed matter physics, physics and engineering at low temperatures, physics and engineering of accelerators, physical experimental instruments and methods, physical computation experiments, applied research in these branches of physics and radiology, ecology and nuclear medicine.