[Halld-physics] abstract to QNP2018

[Mark Macrae Dalton]

Dear Lubomir,

I would replace "claimed by LHCb” with "reported by LHCb”.  

Regards,
Mark


> On Jun 25, 2018, at 3:01 PM, Lubomir Pentchev <pentchev at jlab.org> wrote:
> 
> Dear all,
> 
> I'm planning to submit an abstract to the Conference on Quarks and Nuclear Physics (Tsukuba, Japan). The previous one of the series was in Valparaiso, Chile in 2015, and some of you have participated.
> 
> My abstract is attached as a pdf and inserted below as a tex. Please let me know if you have suggestions.
> 
> Thanks,
> Lubomir
> 
> Threshold J/$\psi $ photoproduction with GlueX at Jefferson Lab
> 
> We will report, for a first time at a conference, preliminary results for the J/$\psi $ production cross-section 
> from the threshold, at $8.2$ GeV, up to a photon energy of $12$ GeV.
> These measurements have a direct relation to the pentaquarks, $P_c(4380)$ and $P_c(4450)$, claimed by LHCb,
> expected to be seen in the s-channel photoproduction $\gamma p \rightarrow P_c \rightarrow J/\psi p$.
> An upper limit on the $P_c(4450) \rightarrow J/\psi p$ branching fraction will be estimated.
> The near threshold production mechanism will be discussed.
> 
> The GlueX experiment uses a linearly-polarized tagged-photon beam produced by electrons from the 12 GeV CEBAF machine. 
> The detector system is based on a 2 T solenoid and includes e.m. calorimeters and drift chambers providing full acceptance coverage.
> Taking advantage of the exclusivity of the reaction and the precise knowledge of the beam energy, 
> we achieve a high mass resolution and a very low background, which allows us to perform more sensitive unbinned analysis. 
> Future plans for the study of threshold J/$\psi $ production will be discussed.
> <QNP2018_abstract.pdf>_______________________________________________
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