Does A Narrow Tetraquark $cc\bar{u}\bar{d}$ State Exist?

Abstract

The existence of a shallow or virtual tetraquark state, $cc\bar{u}\bar{d}$, is discussed. Using the putative masses for the doubly charmed baryons ($ccu/ccd$) from SELEX, the mass of the $cc\bar{u}\bar{d}$ state is estimated to be about $3.9GeV$, only slightly above the $D{D}^{\ast }$ threshold. The experimental signatures for various $cc\bar{u}\bar{d}$ masses are also discussed.

LaTeX, 16 pages

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• Measurement of $J/\psi$ production in continuum $e^{+}{e}^{-}$ annihilations near $\sqrt{s}=10.6$ GeV

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