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Achasov, M. N.; Barnyakov, A. Yu; Baykov, A. A.; Beloborodov, K. I.; Berdyugin, A. V.; Bogdanchikov, A. G.; Botov, A. A.; Golubev, V. B.; Dimova, T. V.; Druzhinin, V. P.; Zhabin, V. N.; Kardapoltsev, L. V.; Kovrizhin, D. P.; Korol, A. A.; Kupich, A. S.; Martin, K. A.; Melnikova, N. A.; Muchnoi, N. Yu; Obrazovsky, A. E.; Pakhtusova, E. V.; Pugachev, K. V.; Savchenko, Ya. S.; Serednyakov, S. I.; Silagadze, Z. K.; Surin, I. K.; Usov, Yu. V.; Kharlamov, A. G.; Shtol, D. A.
Physics of atomic nuclei, 2021/3, Letnik: 84, Številka: 2Journal Article
The process is studied in the range of center-of-mass (c.m.) collision energies between 1.05 and 2.00 GeV on the basis of data corresponding to an integrated luminosity of 94.5 pb that were accumulated in an experiment with the SND detector at the VEPP-2000 collider. The cross section for this process was measured for the first time and was found to receive a dominant contribution from the mechanism of a transition through an intermediate state. The cross section measured for the process agrees with the results of earlier measurements in the channel . At a level of 5.7 standard deviations (5.7 ), it is established that the process is not fully described by hadronic intermediate states of the type. The cross section was measured for this missing contribution, which may be generated by radiative processes—for example, . It ranges from 15 to 20 pb over a broad energy interval extending from 1.3 to 1.9 GeV.
