Marc Pelizaeus - Meson

Charmonium candidates X(3872) and Y(4260)
• Below Dð threshold
– detailed information about J/ψ,ψ′, χ cJ
– less knowledge on η c ,η′,h c
• Above Dð threshold many predicted
states still undetected
Y(4260)
• Two candidates in this region are
X(3872) Dð *
Dð
X(3872) (→J/ψπ + π − , J/ψγ, D 0 ð 0 π 0 ψ´
)
η´
h
m=3871.2±0.6 MeV, Γ