[Halld-physics] Abstract: J/psi @ DNP

[Alexander Austregesilo]

Dear Colleagues,

I want to submit the attached abstract for the DNP meeting in October 
(https://www.aps.org/meetings/meeting.cfm?name=HAW18).

Unfortunately, the submission deadline is already today, July 2, at 
11:59 ET.

Corrections and suggestions are very welcome.

Best regards,

Alex


===


Threshold Photoproduction of J/ψ at GlueX

The GlueX experiment at Jefferson Lab uses a 12 GeV electron beam to pro-
duce tagged photons via coherent Bremsstrahlung. This linearly-polarized
photon beam impinges on a liquid-hydrogen target contained within a her-
metic detector with near-complete coverage by drift chambers and electro-
magnetic calorimeters. The available energy range is ideal to study the J/ψ
production close to its threshold at 8.2 GeV and the energy-dependence of
the cross-section is very sensitive to the details of the production mecha-
nism. The cross-section is also closely related to the s-channel production
of the pentaquark resonances P c (4380) and P c (4450) observed by LHCb in
J/ψp 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 results for the
cross-section and an upper limit on the P c → J/ψp branching fraction.


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