First Physical Results from SND Detector at VEPP-2M

M. N. Achasov; M. G. Bek; K. I. Beloborodov; A. V. Berdyugin; A. V. Bozhenok; A. D. Bukin; D. A. Bukin; S. V. Burdin; V. V. Danilov; T. V. Dimova; S. I. Dolinsky; V. P. Druzhinin; M. S. Dubrovin; I. A. Gaponenko; V. B. Golubev; V. N. Ivanchenko; P. I. Ivanov; I. A. Koop; A. A. Korol; M. S. Korostelev; S. V. Koshuba; A. P. Lysenko; A. A. Mamutkin; I. N. Nesterenko; E. V. Pakhtusova; E. A. Perevedentsev; A. A. Polunin; E. G. Pozdeev; V. I. Ptitsyn; E. E. Pyata; A. A. Salnikov; A. V. Savchkov; V. V. Shary; S. I. Serednyakov; Yu. M. Shatunov; V. A. Sidorov; Z. K. Silagadze; A. N. Skrinsky; Yu. V. Usov; A. A. Valishev; A. V. Varganov; A. V. Vasiljev; Yu. S. Velikzhanin

arXiv · hep-ex/9710017

First Physical Results from SND Detector at VEPP-2M

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Abstract

The paper describes experiments with the SND detector at VEPP-2M collider, carried out during the period from October 1995 until June 1997. The total integrated luminosity of 6.4 pb^{-1} was collected in the energy range 2E=0.4-1.4 GeV (MHAD97 experiment), corresponding to 4*10^5 mu^+ mu^- pairs produced. Preliminary results of the 1996 phi-meson experiment (FI96) are presented. The total number of phi-mesons produced is 4*10^6. New data on rare decays of phi and eta (550) mesons, in particular B(phi -> eta gamma) = (1.30+-0.06+-0.07)%, B(phi -> pi^0 pi^0 gamma) = (1.1+-0.2)*10^{-4}, (M_{pi^0 pi^0} > 800 MeV), B(phi -> f^0 gamma) = (4.7+-1.0)*10^{-4}, B(phi -> eta pi^0 gamma) = (1.3+-0.5)*10^{-4}, B(phi -> eta' gamma) < 1.7*10^{-4}, B(phi -> 2 pi^0 ) < 6*10^{-4} were obtained.

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M. N. Achasov, M. G. Bek, K. I. Beloborodov, A. V. Berdyugin, A. V. Bozhenok, A. D. Bukin, D. A. Bukin, S. V. Burdin, V. V. Danilov, T. V. Dimova, S. I. Dolinsky, V. P. Druzhinin, M. S. Dubrovin, I. A. Gaponenko, V. B. Golubev, V. N. Ivanchenko, P. I. Ivanov, I. A. Koop, A. A. Korol, M. S. Korostelev, S. V. Koshuba, A. P. Lysenko, A. A. Mamutkin, I. N. Nesterenko, E. V. Pakhtusova, E. A. Perevedentsev, A. A. Polunin, E. G. Pozdeev, V. I. Ptitsyn, E. E. Pyata, A. A. Salnikov, A. V. Savchkov, V. V. Shary, S. I. Serednyakov, Yu. M. Shatunov, V. A. Sidorov, Z. K. Silagadze, A. N. Skrinsky, Yu. V. Usov, A. A. Valishev, A. V. Varganov, A. V. Vasiljev, Yu. S. Velikzhanin. 1997-10-22. First Physical Results from SND Detector at VEPP-2M. https://arxiv.org/abs/hep-ex/9710017

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