Threshold Photoproduction of J/ψ at GlueX
Conference
·
OSTI ID:1976143
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
The GlueX experiment at Jefferson Lab uses a 12 GeV electron beam to produce tagged photons via coherent Bremsstrahlung. This linearly-polarized photon beam impinges on a liquid-hydrogen target contained within a hermetic detector with near-complete coverage by drift chambers and electromagnetic calorimeters. The available energy range is ideal to study J/? production close to threshold at 8.2 GeV, and the energy-dependence of the cross-section is very sensitive to the details of the production mechanism. The cross-section is also closely related to the s-channel production of the pentaquark resonances Pc+(4380) and Pc+(4450) observed by LHCb in J/?p systems. Taking advantage of the exclusivity of the reaction and the precise knowledge of the beam energy, the GlueX experiment achieves a fine mass resolution and a pure data sample. We will present preliminary results for the cross-section and an upper limit on the Pc+ ? J/?p branching fraction.
- Research Organization:
- Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- DOE Contract Number:
- AC05-06OR23177
- OSTI ID:
- 1976143
- Report Number(s):
- JLAB-PHY-18-2904; DOE/OR/23177-6287
- Country of Publication:
- United States
- Language:
- English
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