Understanding Y(4274) and X(4320) in the $J/ÏÏ$ invariant mass spectrum
arXiv:1309.6718 · doi:10.1016/j.nuclphysa.2013.10.001
Abstract
In this work we study the structures near 4.3 GeV in the $J/ÏÏ$ invariant mass spectra in B meson decay process $B^+\to J/ÏÏK^+$ and two photon fusion process $γγ\to J/ÏÏ$. The Y(4274) as a $D_sD_{s0}$ $(2317)$ molecular is studied in the Bethe-Salpeter equation approach with quasipotential approximation. The absence of Y(4274) in $γγ\to J/ÏÏ$ channel can be well explained by the decay widths of Y(4274) decaying to $γγ$ and $J/ÏÏ$. The distribution of mass difference released by CMS collaboration is reproduced by two resonances near 4.3 GeV, Y(4274) and X(4320). The different production mechanism suggests X(4320) observed in the B decay should be the missing $3^3P_1$ charmonium state $Ï''_{c1}$ and different from X(4350) observed in two photon fusion which can be assigned as $Ï''_{c2}$.
17 pages, 8 figures