Precision Small Scattering Angle Measurements of Elastic Proton-Proton Single and Double Spin Analyzing Powers at the RHIC Hydrogen Jet Polarimeter

Abstract

The Polarized Atomic Hydrogen Gas Jet Target polarimeter is employed by the Relativistic Heavy Ion Collider (RHIC) to measure the absolute polarization of each colliding proton beam. Polarimeter detectors and data acquisition were upgraded in 2015 to increase solid angle, energy range and energy resolution. These upgrades and advanced systematic error analysis along with improved beam intensity and polarization in RHIC runs 2015 ($E_{\text{beam}}=100\text{GeV}$) and 2017 ($255\text{GeV}$) allowed us to greatly reduce the statistical and systematic uncertainties for elastic spin asymmetries, $A_N(t)$ and $A_{N}N(t)$, in the Coulomb-nuclear interference momentum transfer range $0.0013<-t<0.018{\text{GeV}}^2$. For the first time hadronic single spin-flip $r_5$ and double spin-flip $r_2$ amplitude parameters were reliably isolated at these energies and momentum transfers. Measurements at two beam energies enable a separation of Pomeron and Regge pole contributions to $r_5(s)$ and $r_2(s)$, indicating that the spin component may persist at high energies.

arXiv comment6 pages, 6 figures. Accepted for publication in Physical Review Letters

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Cited by in corpus (13)

• Spin-dependent Pomeron and Odderon in elastic proton-proton scattering
• Systematic error analysis in the absolute hydrogen gas jet polarimeter at RHIC
• Corrections to the Elastic Proton-Proton Analyzing Power Parametrization at High Energies
• Probing the Pomeron spin structure with Coulomb-nuclear interference
• Coulomb phase corrections to the transverse analyzing power $A_N(t)$ in high energy forward proton-proton scattering
• Feasibility study for precisely measuring the EIC ${}^3$He beam polarization with the Polarized Atomic Hydrogen Gas Jet Target polarimeter at RHIC
• Breakup corrections to the ${}^3$He beam polarization measurements at the future BNL Electron Ion Collider
• Breakup corrections to spin asymmetries in the ${}^3$He beam polarization measurements with the Polarized Atomic Hydrogen Gas Jet Target
• Polarization Measurements of $p^{\uparrow }$ and ${}^3$He${}^{\uparrow }$ Beams at RHIC and Future EIC Using the Polarized Atomic Hydrogen Gas Jet Target
• Numerical Calculation of Coulomb Corrections in Forward Elastic $p^{\uparrow }p$ and $p^{\uparrow }A$ Scattering
• On the possibility of measuring the polarization of a ${}^3\mathrm{He}$ beam at EIC by the HJET polarimeter
• Absorptive corrections to the electromagnetic form factor in high-energy elastic proton-proton scattering
• Evaluation of the beam-induced depolarization of the HJET target at the EIC