Identifying Glueball at 3.02 GeV in Baryonic $B$ Decays

TL;DR

This paper suggests that an enhancement observed around 3 GeV in baryonic B decays is a glueball candidate, specifically the X(3020), potentially the first glueball state above 3 GeV, based on resonance analysis.

Contribution

The study identifies a new resonance as a potential glueball, providing mass and width measurements, and links it to observed spectra in baryonic B decays.

Findings

The enhancement at 3.02 GeV is consistent with a glueball resonance.

The resonance is observed in multiple decay channels.

The measured mass and width support the glueball hypothesis.

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 $\bar B^0\to p\bar p D^{*0}$ decay.