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27 April 2024

» arxiv » hep-ex/0106048

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Study of the $pipi$ mass spectra in the process $e^+e^- o pi^+pi^-pi^0$ at $sqrt[]{s} simeq 1020$ MeV
M.N.Achasov ; V.M.Aulchenko ; K.I.Beloborodov ; A.V.Berdyugin ; A.G.Bogdanchikov ; A.V.Bozhenok ; A.D.Bukin ; D.A.Bukin ; S.V.Burdin ; T.V.Dimova ; V.P.Druzhinin ; V.B.Golubev ; V.N.Ivanchenko ; P.M.Ivanov ; A.A.Korol ; M.S.Korostelev ; S.V.Koshuba ; A.V.Otboev ; E.V.Pakhtusova ; E.A.Perevedentsev ; A.A.Salnikov ; S.I.Serednyakov ; V.V.Shary ; Yu.M.Shatunov ; V.A.Sidorov ; Z.K.Silagadze ; A.V.Vasiljev ; Yu.S.Velikzhanin ;
Date:	12 Jun 2001
Journal:	Phys.Rev. D65 (2002) 032002
Subject:	hep-ex
Abstract:	The invariant mass spectra of the $pi^+pi^-$ and $pi^pmpi^0$ pairs in the process $e^+e^- o pi^+pi^-pi^0$ were studied in the SND experiment at the VEPP-2M collider in the energy region $sqrt[]{s} simeq 1020$ MeV. These studies were based on about $0.5 imes 10^6$ experimental events. The spectra were analyzed in the framework of the vector meson dominance model. It was found that the experimental data can be described with $e^+e^- o hopi o pi^+pi^-pi^0$ transition only. Upper limit on the branching ratio of the $phi(1020) opi^+pi^-pi^0$ decay through intermediate states different from $ hopi$ was obtained at the 90 % confidence level: $B(phi opi^+pi^-pi^0)<6 cdot 10^{-4}$. The $ ho$-meson mass and width which follow from the spectra analysis are $m_ ho=775.0pm 1.3$ MeV, $Gamma_ ho=150.4 pm 3.0$ MeV. Neutral and charged $ ho$-mesons mass difference was found to equal $m_{ ho^pm}-m_{ ho^0}=-1.3pm2.3$ MeV. In the $pi^+pi^-$ mass spectrum the $ ho-omega$ interference was seen at two standard deviations level.
Source:	arXiv, hep-ex/0106048
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