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-...

Descripción completa

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
_version_ 1780951826840944640
author 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.
author_facet 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.
author_sort Ferroli, R. Baldini
collection CERN
description 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- cross section. The possibility that the two-gluon plus one-photon decay mechanism is not suppressed by G-parity conservation is discussed, even by considering other multipion decay channels. As also obtained by phenomenological computation, such a decay mechanism could be responsible for the observed discrepancy. Finally, we notice that the BESIII experiment, having the potential to perform an accurate measurement of the e+e-→π+π- cross section in the J/ψ mass energy region, can definitely prove or disprove this strong G-parity-violating mechanism by confirming or confuting the BABAR data.
id cern-2210763
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2016
record_format invenio
spelling cern-22107632021-05-03T20:31:40Zdoi:10.1103/PhysRevD.95.034038http://cds.cern.ch/record/2210763engFerroli, R. BaldiniDe 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.A new $G$-parity violating amplitude in the $J/\psi$ decay?hep-phParticle Physics - PhenomenologyThe 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- cross section. The possibility that the two-gluon plus one-photon decay mechanism is not suppressed by G-parity conservation is discussed, even by considering other multipion decay channels. As also obtained by phenomenological computation, such a decay mechanism could be responsible for the observed discrepancy. Finally, we notice that the BESIII experiment, having the potential to perform an accurate measurement of the e+e-→π+π- cross section in the J/ψ mass energy region, can definitely prove or disprove this strong G-parity-violating mechanism by confirming or confuting the BABAR data.The $J/\psi$ meson has negative $G$-parity so that, in the limit of isospin conservation, its decay into $\pi^+\pi^-$ should be purely electromagnetic. However, the measured branching fraction $\mathcal{B}(J/\psi\to\pi^+\pi^-)$ exceeds by more than 3.9 standard deviations the expectation computed according to BaBar data on the $e^+e^-\to\pi^+\pi^-$ cross section. The possibility that the two-gluon plus one-photon decay mechanism is not suppressed by $G$-parity conservation is discussed, even by considering other multi-pion decay channels. As also obtained by phenomenological computation, such a decay mechanism could be responsible for the observed discrepancy. Finally, we notice that the BESIII experiment, having the potential to perform an accurate measurement of the $e^+e^-\to\pi^+\pi^-$ cross section in the 3 GeV energy region, can definitely prove or disprove this strong $G$-parity-violating mechanism by confirming or confuting the BaBar data.arXiv:1608.07191oai:cds.cern.ch:22107632016-08-25
spellingShingle hep-ph
Particle Physics - Phenomenology
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.
A new $G$-parity violating amplitude in the $J/\psi$ decay?
title A new $G$-parity violating amplitude in the $J/\psi$ decay?
title_full A new $G$-parity violating amplitude in the $J/\psi$ decay?
title_fullStr A new $G$-parity violating amplitude in the $J/\psi$ decay?
title_full_unstemmed A new $G$-parity violating amplitude in the $J/\psi$ decay?
title_short A new $G$-parity violating amplitude in the $J/\psi$ decay?
title_sort new $g$-parity violating amplitude in the $j/\psi$ decay?
topic hep-ph
Particle Physics - Phenomenology
url https://dx.doi.org/10.1103/PhysRevD.95.034038
http://cds.cern.ch/record/2210763
work_keys_str_mv AT ferrolirbaldini anewgparityviolatingamplitudeinthejpsidecay
AT demorif anewgparityviolatingamplitudeinthejpsidecay
AT destefanism anewgparityviolatingamplitudeinthejpsidecay
AT maggioram anewgparityviolatingamplitudeinthejpsidecay
AT pacettis anewgparityviolatingamplitudeinthejpsidecay
AT yanl anewgparityviolatingamplitudeinthejpsidecay
AT bertanim anewgparityviolatingamplitudeinthejpsidecay
AT calcaterraa anewgparityviolatingamplitudeinthejpsidecay
AT felicig anewgparityviolatingamplitudeinthejpsidecay
AT patterip anewgparityviolatingamplitudeinthejpsidecay
AT wangyd anewgparityviolatingamplitudeinthejpsidecay
AT zalloa anewgparityviolatingamplitudeinthejpsidecay
AT bettonid anewgparityviolatingamplitudeinthejpsidecay
AT cibinettog anewgparityviolatingamplitudeinthejpsidecay
AT farinellir anewgparityviolatingamplitudeinthejpsidecay
AT fioravantie anewgparityviolatingamplitudeinthejpsidecay
AT garziai anewgparityviolatingamplitudeinthejpsidecay
AT mezzadrig anewgparityviolatingamplitudeinthejpsidecay
AT santorov anewgparityviolatingamplitudeinthejpsidecay
AT savriem anewgparityviolatingamplitudeinthejpsidecay
AT bianchif anewgparityviolatingamplitudeinthejpsidecay
AT grecom anewgparityviolatingamplitudeinthejpsidecay
AT marcellos anewgparityviolatingamplitudeinthejpsidecay
AT spataros anewgparityviolatingamplitudeinthejpsidecay
AT carlonicalamecm anewgparityviolatingamplitudeinthejpsidecay
AT montagnag anewgparityviolatingamplitudeinthejpsidecay
AT nicrosinio anewgparityviolatingamplitudeinthejpsidecay
AT piccininif anewgparityviolatingamplitudeinthejpsidecay
AT ferrolirbaldini newgparityviolatingamplitudeinthejpsidecay
AT demorif newgparityviolatingamplitudeinthejpsidecay
AT destefanism newgparityviolatingamplitudeinthejpsidecay
AT maggioram newgparityviolatingamplitudeinthejpsidecay
AT pacettis newgparityviolatingamplitudeinthejpsidecay
AT yanl newgparityviolatingamplitudeinthejpsidecay
AT bertanim newgparityviolatingamplitudeinthejpsidecay
AT calcaterraa newgparityviolatingamplitudeinthejpsidecay
AT felicig newgparityviolatingamplitudeinthejpsidecay
AT patterip newgparityviolatingamplitudeinthejpsidecay
AT wangyd newgparityviolatingamplitudeinthejpsidecay
AT zalloa newgparityviolatingamplitudeinthejpsidecay
AT bettonid newgparityviolatingamplitudeinthejpsidecay
AT cibinettog newgparityviolatingamplitudeinthejpsidecay
AT farinellir newgparityviolatingamplitudeinthejpsidecay
AT fioravantie newgparityviolatingamplitudeinthejpsidecay
AT garziai newgparityviolatingamplitudeinthejpsidecay
AT mezzadrig newgparityviolatingamplitudeinthejpsidecay
AT santorov newgparityviolatingamplitudeinthejpsidecay
AT savriem newgparityviolatingamplitudeinthejpsidecay
AT bianchif newgparityviolatingamplitudeinthejpsidecay
AT grecom newgparityviolatingamplitudeinthejpsidecay
AT marcellos newgparityviolatingamplitudeinthejpsidecay
AT spataros newgparityviolatingamplitudeinthejpsidecay
AT carlonicalamecm newgparityviolatingamplitudeinthejpsidecay
AT montagnag newgparityviolatingamplitudeinthejpsidecay
AT nicrosinio newgparityviolatingamplitudeinthejpsidecay
AT piccininif newgparityviolatingamplitudeinthejpsidecay

Ejemplares similares