The longitudinal asymmetry of the ( e , e ′ p ) missing momentum distribution as a signal of color transparency
نویسندگان
چکیده
We use multiple scattering theory to evaluate the Q 2 dependence of the forward-backward asymmetry, A z , of the missing momentum distribution in quasielstic A(e, e ′ p) scattering, which is expected to be affected by color transparency. The novel features of our analysis are a consistent treatment of the structure of the ejectile state formed after absorption of the virtual photon by the struck proton and a careful evaluation of the background asymmetry induced by the nonvanishing real part of the proton-nucleon scattering amplitude. We find that the absolute magnitude of A z is dominated by this background at the Q 2 's attainable at the Continuous Electron Beam Accelerator Facility. However, the Q 2 dependence of the asymmetry is sensitive to the onset of color transparency, whose observation in high statistics experiments appears to be feasible, particularly using light targets such as 12 C or 16 O.
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