New molecular candidates: X(1910), X(2200), and X(2350)

Abstract

Assuming the newly observed resonant structures X(1910), X(2200), and X(2350) as $\omega \omega$, $\omega \varphi$, and $\varphi \varphi$ molecular states respectively, we compute their mass values in the framework of QCD sum rules. The numerical results are $1.97\pm 0.17GeV$ for $\omega \omega$ state, $2.07\pm 0.21GeV$ for $\omega \varphi$ state, and $2.18\pm 0.29GeV$ for $\varphi \varphi$ state, which coincide with the experimental values of X(1910), X(2200), and X(2350), respectively. This supports the statement that X(1910), X(2200), and X(2350) could be $\omega \omega$, $\omega \varphi$, and $\varphi \varphi$ molecular candidates respectively.

Comments: 9 pages, 9 eps figures; the name of X(2000) changed to X(1910) according to the updated data of experiments; more references and discussions added; accepted for publication in PRD. arXiv admin note: substantial text overlap with arXiv:1211.2277, arXiv:1201.3412