A new $G$-parity violating amplitude in the $J/\psi$ decay?

The J/ψ meson has negative G parity so that, in the limit of isospin conservation, its decay into π+π- should be purely electromagnetic. However, the measured branching fraction B(J/ψ→π+π-) exceeds by more than 4.5 standard deviations the expectation computed according to BABAR data on the e+e-→π+π-...

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Detalles Bibliográficos
Autores principales: Ferroli, R. Baldini, De Mori, F., Destefanis, M., Maggiora, M., Pacetti, S., Yan, L., Bertani, M., Calcaterra, A., Felici, G., Patteri, P., Wang, Y.D., Zallo, A., Bettoni, D., Cibinetto, G., Farinelli, R., Fioravanti, E., Garzia, I., Mezzadri, G., Santoro, V., Savrié, M., Bianchi, F., Greco, M., Marcello, S., Spataro, S., Carloni Calame, C. M., Montagna, G., Nicrosini, O., Piccinini, F.
Lenguaje:eng
Publicado: 2016
Materias:
hep-ph
Particle Physics - Phenomenology
Acceso en línea:https://dx.doi.org/10.1103/PhysRevD.95.034038
http://cds.cern.ch/record/2210763

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