2015/10/01 by Nuruzzaman Nuruzzaman, Nuruzzaman
Chemistry · Engineering · Physics and Astronomy · #Advanced NMR Techniques and Applications #FOS: Physical sciences #Nuclear Experiment (nucl-ex) #Particle Accelerators and Free-Electron Lasers #nucl-ex
paper · pdf · doi:10.48550/arxiv.1510.00449
CIPANP2015, 8 pages, 5 figures
arxiv created 2015/10/01 · openalex publication_date 2015/10/01 · arxiv updated 2015/10/05 · openalex created_date 2024/04/11 · openalex updated_date 2026/07/28
The beam normal single spin asymmetry (B\rm n) is generated in the scattering of transversely polarized electrons from unpolarized nuclei. The asymmetry arises from the interference of the imaginary part of the two-photon exchange with the one-photon exchange amplitude. The Q\rm weak experiment has made the first measurement of B\rm n in the production of the Δ(1232) resonance, using the Q\rm weak apparatus in Hall-C at the Thomas Jefferson National Accelerator Facility. The final transverse asymmetry, corrected for backgrounds and beam polarization, is B\rm n = 43 ± 16 ppm at beam energy 1.16 GeV at an average scattering angle of about 8.3 degrees, and invariant mass of 1.2 GeV. The measured preliminary B\rm n agrees with a preliminary theoretical calculation. B\rm n for the Δ is the only known observable that is sensitive to the Δ elastic form-factors (γ*ΔΔ) in addition to the generally studied transition form-factors (γ*NΔ), but extracting this information will require significant theoretical input.