March 22nd, 2019

Attended: Moskov, Justin, Mikhail, Sean, Jim, and Igor

Tentative agenda:

- Revision of the PAC46 proposal to resubmit it for PAC47

- GlueX Collaboration’s endorsement. There is an endorsement letter signed by key people of experimental groups of the GlueX Collaboration [1]

• Definition of GlueX Collaboration endorsement from bylaws
• Timeline for PAC47 approval within GlueX
  • April 1: Proposal proponents request an internal review for endorsement
  • April 8: Draft proposal submitted to internal review committee with charge from CB
  • May 15: Internal review committee responds to charge, then CB and EG decide if proposal will be put up for a vote (at Collaboration Meeting)
  • May 27: Initiate vote for proposal endorsement (2 weeks for vote)
  • June 10: PAC47 proposal deadline
• For the April 8th deadline we plan to address the comments from the previous (PAC46) report:
  • Effects of systematic uncertainties on our results
  • Lack of awareness of competition in the international community, and impact this has on scheduling
  • The proponents should describe the physics impact (for example, how will new baryon states test lattice QCD?), including effects of systematic errors on partial wave analyses.
  • Demonstrate that systematic errors are under control, given the very small systematic errors expected, including energy resolution and acceptance at low -t.

- New calculations for KLP-->K+Xi0

- News for the flux monitor

- News for the Be-production target

- News for CPS

- News for the recent GlueX run with the Be-target

- Schedule for KLF meetings

The total cross section for KLp-->K+Xi0 and impact for Sigma(2030)7/2+ [2] and Sigma(1950)5/2-[3]. Differential cross section at W = 1940 MeV to compare 100 and 20 day run period [4]. Similar for pol measurements [5].

Sigma(1920)5/2- new

100d M = 1.923+-0.010+-0.010 GeV G = 0.321+-0.010+-0.010 GeV

20d    M = 1.977+-0.021+-0.025 GeV      G = 0.327+-0.025+-0.025 GeV  

PDG2018 M = 1.775+-0.005 GeV G = 0.120+-0.015 GeV

LQCD M = 1.212 GeV

           M = 1.487 GeV 
           M = 1.590 GeV
           M = 1.663 GeV

Sigma(2030)7/2+ ****

100d M = 1.930+-0.020+-0.030 GeV G = 0.400+-0.040 GeV

 20d   M = 1.981+-0.030+-0.030 GeV   G = 0.350+-0.080 GeV  

PDG2018 M = 2.030+-0.008 GeV G = 0.180+-0.025 GeV

LQCD M = 1.606 GeV

           M = 1.620 GeV 
           M = 1.670 GeV
           M = 1.678 GeV  

LQCD: R. G. Edwards et al. [Hadron Spectrum Collaboration], Phys. Rev. D 87, no. 5, 054506 (2013)