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16–21 Aug 2019
Guilin Bravo Hotel, Guilin, China
Asia/Shanghai timezone

First measurement of near-threshold J/ψ photoproduction and search for the LHCb Pc+ states

18 Aug 2019, 16:15
25m
Golden Cassia (Guilin Bravo Hotel, Guilin, China)

Golden Cassia

Guilin Bravo Hotel, Guilin, China

14 South Ronghu Road, Xiangshan, Guilin 541002, Guangxi, China
Leading parallel Session 3: Exotic hadrons and candidates Session 3: Exotic hadrons and candidates

Speaker

Sean Dobbs (Florida State University)

Description

Photoproduction of charmonium near threshold gives an excellent probe for studying the gluonic structure of the nucleon. Of more recent interest is the possibility of producing the $P_c^+$ pentaquark candidates reported by LHCb in the s-channel reaction: $\gamma p -> P_c^+ \to p J/\psi$. We report on the measurement of the total cross section $\sigma(\gamma p \to p J/\psi)$ in 10 bins of photon beam energy down to the threshold of $E_\gamma = 8.2$ GeV using a tagged photon beam with the GlueX experiment at Jefferson Lab. We find the cross section as a function of beam energy to fall less steeply near threshold than expectations from lowest-order calculations. We also find no evidence for the photoproduction of the Pc states and set upper limits on their production and $\mathcal{B}(P_c^+ -> J/\psi p)$. We will also discuss the future prospects for extending these measurements at GlueX.

Primary author

Sean Dobbs (Florida State University)

Presentation materials