Measurement of the \({e^{+}e^{-}\to\pi^{0}\gamma}\) Cross Section near the \({\phi}{(1020)}\) Resonance with the SND Detector

IF 0.4 4区物理与天体物理 Q4 PHYSICS, NUCLEAR

Physics of Atomic Nuclei Pub Date : 2025-10-09 DOI:10.1134/S1063778825600885

M. N. Achasov, A. Yu. Barnyakov, K. I. Beloborodov, A. V. Berdyugin, D. E. Berkaev, A. G. Bogdanchikov, A. A. Botov, V. S. Denisov, T. V. Dimova, V. P. Druzhinin, V. N. Zhabin, V. V. Zhulanov, I. M. Zemlyansky, L. V. Kardapoltsev, A. A. Kattsin, A. N. Kirpotin, D. P. Kovrizhin, I. A. Koop, A. A. Korol, A. P. Kryukov, A. S. Kupich, N. A. Melnikova, N. Yu. Muchnoi, A. E. Obrazovsky, I. V. Ovtin, A. A. Oorzhak, E. V. Pakhtusova, E. A. Perevedentsev, K. V. Pugachev, Yu. A. Rogovsky, S. I. Serednyakov, Z. K. Silagadze, I. K. Surin, M. V. Timoshenko, Yu. V. Usov, L. B. Fomin, A. G. Kharlamov, Yu. M. Shatunov, D. A. Shtol, E. A. Eminov

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Abstract

The \(e^{+}e^{-}\to\pi^{0}\gamma\) cross section has been measured in the center-of-mass energy range from 1000 to 1060 MeV with the SND detector at the VEPP-2000 electron-positron collider. At the maximum of the \(\varphi\)(1020) resonance the systematic uncertainty of the cross section measurement is 1.3%, and the statistical uncertainty is 2.2%. To date, this is the most accurate measurement of the \(e^{+}e^{-}\rightarrow\pi^{0}\gamma\) cross section. As a result of data approximation with the vector dominance model the decay branching ratio \(B(\phi\to\pi^{0}\gamma)=(1.452\pm 0.024\pm 0.067)\times 10^{-3}\) has been measured.

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用SND检测器测量\({\phi}{(1020)}\)共振附近\({e^{+}e^{-}\to\pi^{0}\gamma}\)横截面

在VEPP-2000正负电子对撞机上，用SND探测器在1000 ～ 1060 MeV的质心能量范围内测量了\(e^{+}e^{-}\to\pi^{0}\gamma\)截面。在\(\varphi\)（1020）共振最大值处，截面测量的系统不确定度为1.3%, and the statistical uncertainty is 2.2%. To date, this is the most accurate measurement of the \(e^{+}e^{-}\rightarrow\pi^{0}\gamma\) cross section. As a result of data approximation with the vector dominance model the decay branching ratio \(B(\phi\to\pi^{0}\gamma)=(1.452\pm 0.024\pm 0.067)\times 10^{-3}\) has been measured.

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来源期刊

Physics of Atomic Nuclei 物理-物理：核物理

CiteScore

0.60

自引率

25.00%

发文量

审稿时长

3-6 weeks

期刊介绍： Physics of Atomic Nuclei is a journal that covers experimental and theoretical studies of nuclear physics: nuclear structure, spectra, and properties; radiation, fission, and nuclear reactions induced by photons, leptons, hadrons, and nuclei; fundamental interactions and symmetries; hadrons (with light, strange, charm, and bottom quarks); particle collisions at high and superhigh energies; gauge and unified quantum field theories, quark models, supersymmetry and supergravity, astrophysics and cosmology.