E+ @ JLab Sub-Group

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In the line of PAC46 recommendations, we wish to propose to PAC48 indisputable high-impact physics case experiments supporting the development of polarized positron beams at CEBAF. With the expectation of significant experimental signals and a strong physics output, deeply virtual Compton scattering off the proton (p-DVCS) is the golden physics case for positron beams. Based on the PAC46 Letter-of-Intent, we consequently intend to submit two proposals: high precision mesurements of selected unpolarized cross sections with the NPS (Neutral Photon Spectrometer) in Hall C, and a wide kinematical survey of moderate precisions measurements of cross sections and beam spin asymmetries with CLAS12.


e+@NPS proposal

e+@CLAS12 proposal

  • Time-table
 Abstracts for all new proposals due to CLAS chair: May 11, 2020.
 Full proposal due to CLAS reviewers: May 25, 2020.
 First response by review committee: June 1, 2020.
 Revised proposal due to reviewers: June 8, 2020.
 Final committee recommendation: June 15, 2020.
 Proposal submission due to PAC48: June 22, 2020.
 PAC48 Meeting: August 10-14, 2020.