Coulomb-Nuclear Interference in polarized pA scattering
Author:
B. Z. Kopeliovich, M. Krelina, I. K. Potashnikova
Keyword:
High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph)
journal:
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date:
2023-12-06 00:00:00
Abstract
We made the first attempt to understand the observed unusual t-dependence of single-spin asymmetry observed in the HJET experiment at RHIC. On the contrary to the usual division of the interaction amplitudes to pure electromagnetic and strong interaction terms with Coulomb corrections (Coulomb phase), we combine Usually the interaction of hadrons is is presented as long-range Coulomb interaction and short-range strong interaction with Coulomb corrections. Such a division gives rise to a Coulomb phase of the hadronic term. On the contrary, here we consider short-range hadronic interaction as a correction to the long-range electromagnetic term, i.e. treat it as absorptive corrections. They significantly affect the Coulomb-nuclear interference, which is a source of single-spin azimuthal asymmetry at very small angles.