Search for the process $\mathbf{\it e^+e^-\to\eta^{\prime}\gamma}$ in the energy range $\mathbf{\it \sqrt{s}}$ = 1.075 -- 2 GeV

M. N. Achasov; A. Yu. Barnyakov; E. V. Bedarev; K. I. Beloborodov; A. V. Berdyugin; A. G. Bogdanchikov; A. A. Botov; T. V. Dimova; V. P. Druzhinin; V. N. Zhabin; Yu. M. Zharinov; L. V. Kardapoltsev; A. S. Kasaev; A. A. Kattsin; A. N. Kyrpotin; 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; K. V. Pugachev; S. A. Rastigeev; Yu. A. Rogovsky; A. I. Senchenko; S. I. Serednyakov; Z. K. Silagadze; I. K. Surin; Yu. V. Usov; A. G. Kharlamov; D. E. Chistyakov; Yu. M. Shatunov; S. P. Sherstyuk; D. A. Shtol

arXiv · 2406.17357

Search for the process $\mathbf{\it e^+e^-\to\eta^{\prime}\gamma}$ in the energy range $\mathbf{\it \sqrt{s}}$ = 1.075 -- 2 GeV

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Abstract

The results of the search for the $e^+e^-\to\eta^{\prime}\gamma$ process in the center-of-mass energy range from 1.075 to 2 GeV are presented. We analyze data with an integral luminosity of 746 pb$^{-1}$ accumulated with the SND detector at the $e^+e^-$ collider VEPP-2000 in 2010--2024. The $\eta^{\prime}\to\eta\pi^0\pi^0$ decay is used in the analysis, with the subsequent $\eta$ and $\pi^0$ decays into $\gamma\gamma$. Upper limits not exceeding 13 pb have been set on the $e^+e^-\to\eta^{\prime}\gamma$ cross section at the 90\% confidence level.

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M. N. Achasov, A. Yu. Barnyakov, E. V. Bedarev, K. I. Beloborodov, A. V. Berdyugin, A. G. Bogdanchikov, A. A. Botov, T. V. Dimova, V. P. Druzhinin, V. N. Zhabin, Yu. M. Zharinov, L. V. Kardapoltsev, A. S. Kasaev, A. A. Kattsin, A. N. Kyrpotin, 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, K. V. Pugachev, S. A. Rastigeev, Yu. A. Rogovsky, A. I. Senchenko, S. I. Serednyakov, Z. K. Silagadze, I. K. Surin, Yu. V. Usov, A. G. Kharlamov, D. E. Chistyakov, Yu. M. Shatunov, S. P. Sherstyuk, D. A. Shtol. 2024-06-25. Search for the process $\mathbf{\it e^+e^-\to\eta^{\prime}\gamma}$ in the energy range $\mathbf{\it \sqrt{s}}$ = 1.075 -- 2 GeV. https://arxiv.org/abs/2406.17357

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