Spin asymmetries for elastic proton scattering and the spin-dependent couplings of the Pomeron

Abstract

This paper serves as a report on the large amount of analysis done in conjunction with the polarized proton program at the Relavitistic Heavy Ion Collider at Brookhaven National Laboratory. This comprises elastic scattering data of protons on protons in colliding beam or fixed target mode and proton beams on carbon targets. In addition to providing a model for the energy dependence of the analyzing power of elastic scattering needed for proton polarimetry, it also provides some significant information about the spin dependence of dominant Regge poles. Most notably, the data indicate that the Pomeron has a significant spin-flip coupling. This allows the exploration of the double-spin flip asymmetry A NN for which some data over a wide energy range are now available, along with a concrete realization of a proposed Odderon search.

New mechanism for generating a single transverse spin asymmetry

“…(85) is zero after the integration over x. We thus have an exact result that d(∆σ (γ) ) = 0 (86) in our mechanism for generating photon STSA. Hence the photon STSA is zero, A (γ) N = 0, in the forward production region under consideration.…”

“…In the past, the relation between the odderon and the single and double transverse spin asymmetries was investigated in[82][83][84][85][86] in the pomeron and reggeon formalism.…”

CNI polarimetry with [sup 3]He

“…From our experience with pp and pC we would expect at least a 10% measurement of polarization to be possible in this way and should be applicable to colhding beams [7]. An estimate of this for the neutron for 150 GeV colliding beams of p on ^He is shown in Fig.…”

Forward Helion Scattering and Neutron Polarization

“…The polarized proton programme at RHIC [9] has provided information on the energy dependence [10] of hadronic helicity flip amplitudes for protons scattering off hydrogen and carbon nuclei, particularly for single spin flip amplitudes [11]. Helium-4 targets have also been suggested for proton polarimetry [12].…”