Indications of a Four-Quark Structure for the X(3872) and X(3876) Particles from Recent Belle and BABAR Data

Maiani, L.; Polosa, A. D.; Riquer, V.

Indications of a Four-Quark Structure for the X(3872) and X(3876) Particles from Recent Belle and BABAR Data

Authors

Maiani, L.

Polosa, A. D.

Riquer, V.

Description

Recent results by BELLE and BaBar point to the existence of a second X particle decaying in D^0 D^0bar pi^0, a few MeV above the X(3872). We identify the two X states with the neutral particles predicted by the 4-quark model and show that production and decays are consistent with this assignement. We consider the yet-to-be-observed charged partners and give new hints on how to look for them.
5 pages, some revision of the text, results unchanged. To appear in Phys. Rev. Lett