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, 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
TL;DR
This paper reports on the measurement of the branching ratio and interference phase of the decay phi->pi+pi- using e+e- collision data near the phi resonance, providing precise experimental results.
Contribution
First measurement of the phi->pi+pi- branching ratio and interference phase using the SND detector at VEPP-2M.
Findings
Branching ratio B(phi->pi+pi-) = (7.1 ± 1.1 ± 0.9) x 10^{-5}
Interference phase psi_pi = -(34 ± 4 ± 3) degrees
Precise energy dependence analysis of e+e- -> pi+pi- cross section
Abstract
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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