Double deeply virtual Compton scattering with positron beams at SoLID

Double Deeply Virtual Compton Scattering (DDVCS) is the only experimental channel for the determination of the dependence of the Generalized Parton Distributions (GPDs) on both the average and the transferred momentum independently. The physics observables of the electron induced di-muon production reaction -(e) over bar (+/-) p -> e(+/-) p mu(+) mu(-) off unpolarized hydrogen are discussed. Their measurement with the high luminosity and large acceptance SoLID spectrometer at the Thomas Jefferson National Accelerator Facility, using polarized and unpolarized positron and electron beams at 11 GeV is investigated. This experimental configuration is shown to provide unprecedented access to the GPDs with the determination of the real and imaginary parts of the Compton Form Factor H in an unexplored phase space, and to enable an exploratory investigation of higher twist effects.

Automated summary

Double Deeply Virtual Compton Scattering (DDVCS) is the only experimental channel for accurately determining the dependence of Generalized Parton Distributions (GPDs) on both the average and transferred momentum. Physic observables of the electron induced di-muon production reaction and the measurement using high luminosity and large acceptance SoLID spectrometer show unprecedented access to GPDs, allowing for exploration of higher twist effects.