We investigate the spin-flip component of the Pomeron using the single spin asymmetry, $A_N(t)$ in polarized elastic $pp$ scattering, arising from Coulomb-nuclear interference (CNI) in small-angle elastic scattering.
The previous analyses have missed the absorptive corrections to the Coulomb amplitude of $pp$ elastic scattering, which plays an important role. Namely, interference of ultra-peripheral and central collisions leads to significant changes in $A_N(t)$.
We found that the absorptive corrections considerably affect the results of the analysis of the single spin asymmetry data from
STAR data for $A_N(t)$ at $\sqrt{s}=200$ GeV. At such high energy, the Reggeon contribution is expected to be small so that one can study the Pomeron spin-flip component.
Volume 346 -
23rd International Spin Physics Symposium (SPIN2018) -
Parallel Session: Spin physics in Nuclear Reactions and Nuclei (F. Becattini and o. Hen)
The Pomeron spin-flip and its measurements
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Pre-published on:
August 19, 2019
Published on:
August 23, 2019
Abstract
DOI: https://doi.org/10.22323/1.346.0033
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Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.