Identifying Glueball at 3.02 GeV in Baryonic $B$ Decays

Abstract

We examine the nature of the unknown enhancement around 3 GeV observed by the BABAR collaboration in the $m_{p\bar{p}}$ spectrum of the ${\bar{B}}^0\to p\bar{p}{D}^0$ decay. Suspecting that the peak is a resonance, which can be neither identified as a charmonium state, such as ${\eta }_c$ or $J/\psi$, nor classified as one of the light-flavor mesons, we conclude that it corresponds to a glueball fitted as X(3020) with $(m_X,{\Gamma }_X)=(3020\pm 8,107\pm 30)\text{MeV}$, which could be the first glueball state above 3 GeV. This state also appears in the $m_{p\bar{p}}$ spectrum of the ${\bar{B}}^0\to p\bar{p}{D}^{\ast 0}$ decay.

Comments: 11 pages, 2 figure, title changed, revised version accepted by PLB