The process e+e- pi+ pi- pi0 gamma has been studied at a center-of-mass energy near the Y(4S) resonance using a 89.3 fb-1 data sample collected with the BaBar detector at the PEP-II collider. From the measured 3pi mass spectrum we have obtained the products of branching fractions for the omega and phi mesons, B(omega e+e-)B(omega 3pi)=(6.70 0.06 0.27)10-5 and B(phi e+e-)B(phi 3pi)=(4.30 0.08 0.21)10-5, and evaluated the e+e- pi+ pi- pi0 cross section for the e+e- center-of-mass energy range 1.05 to 3.00 GeV. About 900 e+e- J/psi gamma pi+ pi- pi0 gamma events have been selected and the branching fraction B(J/psi pi+ pi- pi0)=(2.18 0.19)% has been measured.
Study of the e+e-→π+π-π0 process using initial state radiation with BABAR
MARGONI, MARTINO;SIMONETTO, FRANCO;STROILI, ROBERTO;VOCI, CESARE;SIMI, GABRIELE;
2004
Abstract
The process e+e- pi+ pi- pi0 gamma has been studied at a center-of-mass energy near the Y(4S) resonance using a 89.3 fb-1 data sample collected with the BaBar detector at the PEP-II collider. From the measured 3pi mass spectrum we have obtained the products of branching fractions for the omega and phi mesons, B(omega e+e-)B(omega 3pi)=(6.70 0.06 0.27)10-5 and B(phi e+e-)B(phi 3pi)=(4.30 0.08 0.21)10-5, and evaluated the e+e- pi+ pi- pi0 cross section for the e+e- center-of-mass energy range 1.05 to 3.00 GeV. About 900 e+e- J/psi gamma pi+ pi- pi0 gamma events have been selected and the branching fraction B(J/psi pi+ pi- pi0)=(2.18 0.19)% has been measured.
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