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Search for Resonances in the Mass Spectrum of Two-Photon Events Produced in π+A-Interactions in the Hyperon-M Experiment at the U-70 Accelerator Complex

  • FIELDS, PARTICLES, AND NUCLEI
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Studies at the Nuclotron in JINR indicate the presence of a previously unknown resonance-like structure in the two-photon mass spectrum in the region of 300–400 MeV/c2, observed in nucleus–nucleus interactions. The goal of this work is to search for such structures in the two-photon mass spectrum in meson–nuclear interactions at a momentum of 7 GeV/c at the Hyperon-M experiment of the U-70 accelerator complex. An upper limit has been established on the ratio of the cross section for the formation of unknown resonance structures to the cross section for the production of \(\eta \)-meson \(\rho ({{R}_{{ \to 2\gamma }}}{\text{/}}{{\eta }_{{ \to 2\gamma }}}) < 3.2 \times {{10}^{{ - 3}}}\) at the 95% confidence level.

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Funding

This work was carried out at the expense of the Russian   Science Foundation grant no. 22-12-00095, https://rscf.ru/project/22-12-00095/.

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Authors and Affiliations

  1. Institute for High Energy Physics, National Research Center Kurchatov Institute, 142281, Protvino, Moscow region, Russia

    A. M. Gorin, S. V. Evdokimov, V. I. Izucheev, B. V. Polishchuk, K. A. Romanishin, V. I. Rykalin, S. A. Sadovsky, Yu. V. Kharlov & A. A. Shangaraev

  2. Joint Institute of Nuclear Research, 141980, Dubna, Moscow region, Russia

    A. A. Zaitsev

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  1. A. M. Gorin
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  2. S. V. Evdokimov
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  3. A. A. Zaitsev
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  4. V. I. Izucheev
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Correspondence to S. V. Evdokimov.

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Gorin, A.M., Evdokimov, S.V., Zaitsev, A.A. et al. Search for Resonances in the Mass Spectrum of Two-Photon Events Produced in π+A-Interactions in the Hyperon-M Experiment at the U-70 Accelerator Complex. Jetp Lett. 118, 611–618 (2023). https://doi.org/10.1134/S0021364023603032

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