Analyzing power in elastic scattering of the electrons off a spin-0 target

Details Analyzing power in elastic scattering of the electrons off a spin-0 target Analyzing power in elastic scattering of the electrons off a spin-0 target

2008-01-29

arxiv.org/abs/0801.4575v2

Phys.Rev.C77:044606,2008

Physics

Nuclear Physics

Nuclear Theory

6 pages, 8 figure, one table; submitted to Phys.Rev.C; one figure corrrected

Scientific paper

10.1103/PhysRevC.77.044606

We consider the analyzing power on a spin-0 nuclear target. This observable is related to the imaginary part of the two-photon-exchange (box) diagram. We consider the contributions of elastic and inelastic intermediate states. The former requires knowledge of the elastic nuclear form factor, while the latter uses the optical theorem as input. The elastic contribution scales as the nuclear charge $Z$, while the inelastic contribution as the ratio of the atomic number and nuclear charge, $A/Z$. We provide estimates for $^4$He and $^{208}$Pb, in the kinematics of existing or upcoming experiments. In both cases, we predict negative values of a few parts per million, and the dominant contribution is due to inelastic contributions. The analyzing power can contribute a substantial systematic error in parity-violating experiments.

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