Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-03-14
Phys.Lett.B624:217-222,2005
Physics
High Energy Physics
High Energy Physics - Phenomenology
corrected misprints, one figure added, accepted for publication in Phys. Lett. B
Scientific paper
10.1016/j.physletb.2005.08.037
We suggest that the recently observed charmed scalar mesons $D_0^{0}(2308)$ (BELLE) and $D_0^{0,+}(2405)$ (FOCUS) are considered as different resonances. Using the QCD sum rule approach we investigate the possible four-quark structure of these mesons and also of the very narrow $D_{sJ}^{+}(2317)$, firstly observed by BABAR. We use diquak-antidiquark currents and work to the order of $m_s$ in full QCD, without relying on $1/m_c$ expansion. Our results indicate that a four-quark structure is acceptable for the resonances observed by BELLE and BABAR: $D_0^{0}(2308)$ and $D_{sJ}^{+}(2317)$ respectively, but not for the resonances observed by FOCUS: $D_0^{0,+}(2405)$.
Bracco Mirian E.
Lozea A.
Matheus Ricardo D.
Navarra Fernando S.
Nielsen Mikkel
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