NPS Experiments

The NPS Science Program currently includes 8 approved experiments divided into two run groups. The first phase of run group 1 is scheduled for running in 2023/24. Two of the experiments use the NPS in conjunction with other instrumentation, e.g., Compact Photon Source, Positron Beams, etc.

Run Group 1a (NPS at small angles and HMS - SHMS used as carriage for NPS):

• E12-13-010 (Run status: active): Exclusive Deeply Virtual Compton and Neutral Pion Cross-Section Measurements in Hall C Link

• E12-13-007 (Run Status: active): Measurement of Semi-Inclusive pi0 Production as Validation of Factorization Link

• E12-22-006 (Run status: active): Deeply Virtual Compton Scattering off the neutron with the Neutral Particle Spectrometer in Hall C Link

• E12-23-014 (Run status: active): Measurements of the Ratio R = sigmaL/sigmaT p/d ratios, Pt dependence, and azimuthal asymmetries in Semi-Inclusive DIS pi0 production form proton and deuteron targets using the NPS in Hall C Link

Run Group 1b (NPS at small angles and HMS - SHMS used as carriage for NPS):

• E12-06-114 (35 days moved to Hall C): Measurements of the electron-helicity dependent cross-sections of deeply virtual Compton scattering

Run Group 2 (NPS at large angles and HMS - SHMS used as carriage for NPS):

• E12-14-003: Wide-angle Compton Scattering at 8 and 10 GeV Photon Energies Link

• E12-14-005: Wide Angle Exclusive Photoproduction of pi-zero Mesons Link

Run Group 3 (NPS+CPS - SHMS used as carriage for NPS)

• E12-17-008: Polarization Observables in Wide-Angle Compton Scattering at large s, t, and u Link

Run Group 4 (NPS reconfigured as part of an ECAL+HCAL system downstream from target)

• E12-17-008: A Search for a Nonzero Strange Form Factor of the Proton at 2.5 (GeV/c)^2 Link

Run Group 5 (NPS+Positrons)

• C12-20-012 (status C2): Deeply Virtual Compton Scattering using a positron beam in Hall C Link

LOIs and proposal being developed

• LOI12-23-003: GluToNY: Gluon tomography in nucleons by gamma-polarimetry

• LOI12-23-014: Recoil Nucleon Polarization in Deeply Virtual Compton Scattering and Neutral Pion Electroproduction in Hall C

• C12-18-005: Timelike Compton Scattering Off a Transversely Polarized Proton Link (requires NPS + CPS)