Charmonium narrow resonances in the string breaking region

J Segovia (1) , D R Entem (1) , F Fernández (1)

1 IUFFyM

We study the properties of excited charmonium states near the confinement string breaking region using a screened confinement potential. Recent data on e + e − → Λ c ¯ Λ c and e + e − → J/ψππ are discussed. We find that, in this energy region, S and D states became almost degenerated with a narrow width. The measure of these states can contribute to a more accurate knowledge of the confinement interaction.

Mots clés: Charmonium; confinement; quark models

J Segovia, D R Entem, F Fernández. Charmonium narrow resonances in the string breaking region. Journal of Physics G: Nuclear and Particle Physics, 2010, 37 (7), pp.75010. ⟨10.1088/0954-3899/37/7/075010⟩. ⟨hal-00630018⟩