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Decay phi->pi+pi-

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arxiv hep-ex/0001048 v1 pith:4NDGZDW2 submitted 2000-01-21 hep-ex

Decay phi->pi+pi-

M.N.Achasov , K.I.Beloborodov , A.V.Berdyugin , A.V.Bozhenok , A.D.Bukin , D.A.Bukin , S.V.Burdin , T.V.Dimova
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V.P.Druzhinin M.S.Dubrovin D.I.Ganyushin I.A.Gaponenko V.B.Golubev V.N.Ivanchenko P.M.Ivanov A.A.Korol S.V.Koshuba 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.A.Valishev A.V.Vasiljev
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keywords phi-amplitudeanalysisbeenbranchingcollidercrossdecay
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The process e+e- ->pi+pi- has been studied with the SND detector at VEPP-2M e+e- collider in the vicinity of phi(1020) resonance. From the analysis of the energy dependence of measured cross section the branching ratio B(phi->pi+pi-)=(7.1+-1.1+-0.9)*10^{-5} and the phase psi_pi=-(34+-4+-3)degrees of interference with the non-resonant pi+pi- production amplitude were obtained.

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