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.

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

References in corpus (2)

• Single Spin Asymmetry $A_N$ in Polarized Proton-Proton Elastic Scattering at $\sqrt{s}=200$ GeV
• Spin asymmetries for elastic proton scattering and the spin dependent couplings of the Pomeron

Cited by in corpus (10)

• Systematic error analysis in the absolute hydrogen gas jet polarimeter at RHIC
• Corrections to the Elastic Proton-Proton Analyzing Power Parametrization at High Energies
• 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
• Polarization Measurements of $p^{\uparrow }$ and ${}^3$He${}^{\uparrow }$ Beams at RHIC and Future EIC Using the Polarized Atomic Hydrogen Gas Jet Target
• Breakup corrections to spin asymmetries in the ${}^3$He beam polarization measurements with the Polarized Atomic Hydrogen Gas Jet Target
• Absorptive corrections to the electromagnetic form factor in high-energy elastic proton-proton scattering
• On the possibility of measuring the polarization of a ${}^3\mathrm{He}$ beam at EIC by the HJET polarimeter
• Numerical Calculation of Coulomb Corrections in Forward Elastic $p^{\uparrow }p$ and $p^{\uparrow }A$ Scattering
• Evaluation of the beam-induced depolarization of the HJET target at the EIC