Modeling a Framework for Comprehensive Analysis of p↑ A Transverse Analyzing Power Measurements at the RHIC HJET
Abstract
We present a model for calculating the forward elastic analyzing power ANpA(t) in proton-nucleus scattering, based on the Glauber approximation and incorporating soft-photon exchange corrections. The model is tested against 100 GeV HJET measurements for several nuclei, including Au, Ru, Zr, Al, O, C, and the deuteron. The calculations use Woods-Saxon parameters to describe the nuclear density distributions, as well as the proton-proton and proton-neutron hadronic spin-flip amplitudes, with the latter constrained by a Regge fit to HJET pp data. Using the nominal input parameters, the calculations provide a reasonable description of the measured analyzing powers, although further refinement is needed to achieve a satisfactory fit. Allowing the input parameters to vary in the fits substantially improves the agreement with the data, yielding effective parametrizations of ANpA(t) in terms of three or four parameters, depending on the nucleus. Notably, the nominal values of the imaginary part of the effective proton-nucleus spin-flip parameter r5pA agree well with the fitted values for all nuclei considered. Subject to the limitations of the present model, this observation concerning Im r5pA is consistent with the proton-proton spin-flip amplitudes measured at HJET and supports the interpretation of a non-zero Pomeron spin-flip coupling. The results presented in this paper also motivate further investigation of the energy dependence of the proton-nucleon spin-flip amplitude using HJET measurements over a broad range of beam energies, with potential applications to proton-carbon and 3He polarimetry at the Electron-Ion Collider.
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BibTeX
@misc{poblaguev2026modeling,
title = {{Modeling a Framework for Comprehensive Analysis of $\boldsymbolp^\uparrow\!A$ Transverse Analyzing Power Measurements at the RHIC HJET}},
author = {Andrei Poblaguev},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.04024},
eprint = {2611.04024},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.04024},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Modeling a Framework for Comprehensive Analysis of p^↑ A Transverse Analyzing Power Measurements at the RHIC HJET
AU - Andrei Poblaguev
PY - 2026
DA - 2026/11/02
PB - arXiv
DO - 10.48550/arxiv.2611.04024
UR - https://arxiv.org/abs/2611.04024
AB - We present a model for calculating the forward elastic analyzing power A_N^pA(t) in proton-nucleus scattering, based on the Glauber approximation and incorporating soft-photon exchange corrections. The model is tested against 100 GeV HJET measurements for several nuclei, including Au, Ru, Zr, Al, O, C, and the deuteron. The calculations use Woods-Saxon parameters to describe the nuclear density distributions, as well as the proton-proton and proton-neutron hadronic spin-flip amplitudes, with the latter constrained by a Regge fit to HJET pp data. Using the nominal input parameters, the calculations provide a reasonable description of the measured analyzing powers, although further refinement is needed to achieve a satisfactory fit. Allowing the input parameters to vary in the fits substantially improves the agreement with the data, yielding effective parametrizations of A_N^pA(t) in terms of three or four parameters, depending on the nucleus. Notably, the nominal values of the imaginary part of the effective proton-nucleus spin-flip parameter r_5^pA agree well with the fitted values for all nuclei considered. Subject to the limitations of the present model, this observation concerning Im r_5^pA is consistent with the proton-proton spin-flip amplitudes measured at HJET and supports the interpretation of a non-zero Pomeron spin-flip coupling. The results presented in this paper also motivate further investigation of the energy dependence of the proton-nucleon spin-flip amplitude using HJET measurements over a broad range of beam energies, with potential applications to proton-carbon and ^3He polarimetry at the Electron-Ion Collider.
ER -