We study the processes e+e--->gamma_ISR J/psi, where J/psi-->pi+pi-pi0, J/psi-->K+K-pi0, and J/psi-->K0S K+- pi-+ using a data sample of 519 fb-1 recorded with the BABAR detector operating at the SLAC PEP-II asymmetric-energy e+e- collider at center-of-mass energies at and near the Upsilon(nS) (n=2,3,4) resonances. We measure the ratio of branching fractions R1=B(J/psi-->K+K-pi0)/B(J/psi-->pi+pi-pi0) and R2=B(J/psi-->K0SK+-pi-+)/B(J/psi-->pi+pi-pi0). We perform Dalitz plot analyses of the three J/psi decay modes and measure fractions for resonances contributing to the decays. We also analyze the J/psi --> pi+pi-po0 decay using the Veneziano model. We observe structures compatible with the presence of rho(1450) in all three J/psi decay modes and measure the relative branching fraction: R(rho(1450))=B(rho(1450)-->K+K-)/B(rho(1450)-->pi+pi-)=0.307±0.084(stat)±0.082(sys).
Dalitz plot analyses of J/psi-->pi+pi-pi0, J/psi-->K+K-pi0, and J/psi-->K0SK+-pi+- produced via e+e- annihilation with initial-state radiation
Calabrese, R.;Garzia, I.;Luppi, E.;
2017
Abstract
We study the processes e+e--->gamma_ISR J/psi, where J/psi-->pi+pi-pi0, J/psi-->K+K-pi0, and J/psi-->K0S K+- pi-+ using a data sample of 519 fb-1 recorded with the BABAR detector operating at the SLAC PEP-II asymmetric-energy e+e- collider at center-of-mass energies at and near the Upsilon(nS) (n=2,3,4) resonances. We measure the ratio of branching fractions R1=B(J/psi-->K+K-pi0)/B(J/psi-->pi+pi-pi0) and R2=B(J/psi-->K0SK+-pi-+)/B(J/psi-->pi+pi-pi0). We perform Dalitz plot analyses of the three J/psi decay modes and measure fractions for resonances contributing to the decays. We also analyze the J/psi --> pi+pi-po0 decay using the Veneziano model. We observe structures compatible with the presence of rho(1450) in all three J/psi decay modes and measure the relative branching fraction: R(rho(1450))=B(rho(1450)-->K+K-)/B(rho(1450)-->pi+pi-)=0.307±0.084(stat)±0.082(sys).I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
