An absolute polarimeter for high energy protons
نویسنده
چکیده
A study of the spin asymmetries for polarized elastic proton proton collisions in the electromagnetic hadronic interference (CNI) region of momentum transfer provides a method of self calibration of proton polarization. The method can be extended to non-identical spin half scattering so that, in principle, the polarization of a proton may be obtained through an analysis of its elastic collision with a different polarized particle, 3He, for instance. Sufficiently large CNI spin asymmetries provide enough information to facilitate the evaluation of nearly all the helicity amplitudes at small t as well as the polarization of both initial spin half fermions. Thus it can serve equally well as a polarimeter for 3He.
منابع مشابه
MPI H - V 3 - 1998 High - Energy Polarimetry at RHIC ∗
We compare a few types of high energy reactions which seem to be practical for polarimetry at RHIC. Coulomb-nuclear interference (CNI) in pp elastic scattering leads to a nearly energy-independent left-right asymmetry AN (t) at small t. The systematical uncertainty of this method is evaluated to be ∼ 10%. The CNI in proton-nucleus elastic scattering is predicted to result in larger values of AN...
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