Decay phi->pi+pi-

Physics – High Energy Physics – High Energy Physics - Experiment

Scientific paper

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6 pages, 5 figures, to be published in Physics Letters B

Scientific paper

10.1016/S0370-2693(00)01477-X

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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