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

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Abstract

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 η">η-meson ρ(R→2γ/η→2γ)<3.2×10−3">ρ(R→2γ/η→2γ)<3.2×10−3 at the 95% confidence level.

About the authors

A. M. Gorin

Institute for High Energy Physics, National Research Center Kurchatov Institute

Email: Sergey.Evdokimov@ihep.ru
142281, Protvino, Moscow region, Russia

S. V. Evdokimov

Institute for High Energy Physics, National Research Center Kurchatov Institute

Email: sergey.evdokimov@ihep.ru
142281, Protvino, Moscow region, Russia

A. A. Zaytsev

Joint Institute of Nuclear Research

Email: Sergey.Evdokimov@ihep.ru
141980, Dubna, Moscow region, Russia

V. I. Izucheev

Institute for High Energy Physics, National Research Center Kurchatov Institute

Email: Sergey.Evdokimov@ihep.ru
142281, Protvino, Moscow region, Russia

B. V. Polishchuk

Institute for High Energy Physics, National Research Center Kurchatov Institute

Email: Sergey.Evdokimov@ihep.ru
142281, Protvino, Moscow region, Russia

K. A. Romanishin

Institute for High Energy Physics, National Research Center Kurchatov Institute

Email: Sergey.Evdokimov@ihep.ru
142281, Protvino, Moscow region, Russia

V. I. Rykalin

Institute for High Energy Physics, National Research Center Kurchatov Institute

Email: Sergey.Evdokimov@ihep.ru
142281, Protvino, Moscow region, Russia

S. A. Sadovskiy

Institute for High Energy Physics, National Research Center Kurchatov Institute

Email: Sergey.Evdokimov@ihep.ru
142281, Protvino, Moscow region, Russia

Yu. V. Kharlov

Institute for High Energy Physics, National Research Center Kurchatov Institute

Author for correspondence.
Email: Sergey.Evdokimov@ihep.ru
142281, Protvino, Moscow region, Russia

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