975 articles – 4378 Notices  [english version]
 HAL : in2p3-00686368, version 1
 arXiv : 1204.1448
 Physical Review D 85 (2012) 114007
 Isospin violating decay of $\psi(3770)\rightarrow J/\psi + \pi^0$
 (2012)
 The strong-isospin violation in $\psi(3770)\rightarrow J/\psi + \pi^0$ via intermediate $D$ meson loops is investigated in an effective Lagrangian approach. In this process, there is only one $D$-meson loop contributing to the absorptive part, and the uncertainties due to the introduction of form factors can be minimized. With the help of QCD spectral sum rules (QSSR), we extract the $J/\psi DD^*$ form factor as an implement from the first principle of QCD. The $DD^*\pi^0$ form factor can be well determined from the experimental data for $D\rightarrow\pi l\nu$. The exploration of the dispersion relation suggests the dominance of the dispersive part via the intermediate $D$ meson loops even below the open charm threshold. This investigation could provide further insights into the puzzling question on the mechanisms for $\psi(3770)\to$ non-$D\bar{D}$ transitions.
 équipe(s) de recherche : théorie
 Thème(s) : Physique/Physique des Hautes Energies - ExpériencePhysique/Physique des Hautes Energies - Phénoménologie
 Lien vers le texte intégral : http://fr.arXiv.org/abs/1204.1448
 in2p3-00686368, version 1 http://hal.in2p3.fr/in2p3-00686368 oai:hal.in2p3.fr:in2p3-00686368 Contributeur : Sylvie Florès <> Soumis le : Mardi 10 Avril 2012, 09:23:42 Dernière modification le : Vendredi 8 Juin 2012, 07:53:17