Breakup corrections to spin asymmetries in the 
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 beam polarization measurements with the Polarized Atomic Hydrogen Gas Jet Target

Poblaguev, A. A.

doi:10.1103/physrevc.108.025202

Cited by 3 publications

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References 24 publications

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“…Since this amplitude was not accurately predetermined, the normalization of the absorption effect remained essentially ambiguous. Nevertheless, relating the pA hadronic spin-flip amplitude to the pp amplitude [24,25] may allow one to reliably isolate the effect of the absorptive correction in the p ↑ A data analysis.…”

Section: Discussionmentioning

confidence: 99%

Coulomb phase corrections to the transverse analyzing power AN(t) in high energy forward proton-proton scattering

Poblaguev

2021

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Recently, it was noted that absorptive corrections to the electromagnetic form factor in highenergy proton-proton scattering are important for the theoretical interpretation of the p ↑ p and p ↑ A analyzing power AN(t) measurements with the Hydrogen Jet Target polarimeter (HJET) at RHIC. Here, a concise expression for the absorptive correction was derived within the eikonal approach. The resulting analysis reveals a systematic bias, nearly independent of the beam energy, in the experimental determination of the real-to-imaginary ratio ρ when absorption effects are overlooked in the data analysis. Quantification of this bias, as ρ meas = ρ+(0.036±0.016) bias , was achieved using a Regge fit applied to available proton-proton measurements of ρ meas (s) and σ meas tot (s). Considering the potential impact of such an effect on the experimentally determined AN(t), one may enhance consistency between the HJET and STAR measurements of the hadronic spin-flip amplitude. While the sign of the bias in the value of ρ aligns with the anticipated effective increase in the proton charge radius in pp scattering due to absorption, it amplifies the observed discrepancy between σ meas tot and ρ meas values at √ s = 13 TeV as measured in the TOTEM experiment. Evaluation (using published TOTEM data) of the measured proton-proton dσ/dt dependence on the absorptive corrections indicated that possible soft photon corrections to the hadronic amplitude slope may be essential for such data analysis.

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Section: Discussionmentioning

confidence: 99%

Coulomb phase corrections to the transverse analyzing power AN(t) in high energy forward proton-proton scattering

Poblaguev

2021

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Absorptive corrections to the electromagnetic form factor in high-energy elastic proton-proton scattering

Poblaguev

2024

Phys. Rev. D

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Recently, it was noted that absorptive corrections to the electromagnetic form factor in high-energy proton-proton scattering are important for the theoretical interpretation of the p↑p and p↑A analyzing power AN(t) measurements with the Hydrogen Jet Target polarimeter (HJET) at RHIC. Here, a concise expression for the absorptive correction was derived within the eikonal approach. The resulting analysis reveals a systematic bias, nearly independent of the beam energy, in the experimental determination of the real-to-imaginary ratio ρ when absorption effects are overlooked in the data analysis. Quantification of this bias, as ρmeas=ρ+(0.036±0.016)bias, was achieved using a Regge fit applied to available proton-proton measurements of ρmeas(s) and σtotmeas(s). Considering the potential impact of such an effect on the experimentally determined AN(t), one may enhance consistency between the HJET and STAR measurements of the hadronic spin-flip amplitude. While the sign of the bias in the value of ρ aligns with the anticipated effective increase in the proton charge radius in pp scattering due to absorption, it amplifies the observed discrepancy between σtotmeas and ρmeas values at s=13 TeV as measured in the TOTEM experiment. Evaluation (using published TOTEM data) of the measured proton-proton dσ/dt dependence on the absorptive corrections indicated that possible soft photon corrections to the hadronic amplitude slope may be essential for such data analysis. Published by the American Physical Society 2024

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Polarization Measurements of p↑ and 3He↑ Beams at RHIC and Future EIC Using the Polarized Atomic Hydrogen Gas Jet Target

Poblaguev

2024

Universe

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At the Relativistic Heavy Ion Collider (RHIC), the Polarized Atomic Hydrogen Gas Jet Target polarimeter (HJET) is employed for the precise measurement of the absolute transverse (vertical) polarization of proton beams, achieving low systematic uncertainties of approximately σPsyst/P≤0.5%. The acquired experimental data not only facilitated the determination of single AN(t) and double ANN(t) spin analyzing powers for 100 and 255 GeV proton beams, but also revealed a non-zero Pomeron spin-flip contribution through a Regge fit. Preliminary results obtained for forward inelastic p↑p and elastic p↑A analyzing powers will be discussed. The success of the HJET at RHIC suggests its potential application for proton beam polarimetry at the upcoming Electron–Ion Collider (EIC), aiming for an accuracy of 1%. Moreover, the provided analysis indicates that the RHIC HJET target can serve as a tool for the precision calibration, with the required accuracy, of the 3He beam polarization at the EIC.

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Breakup corrections to spin asymmetries in the He3 beam polarization measurements with the Polarized Atomic Hydrogen Gas Jet Target

Cited by 3 publications

References 24 publications

Coulomb phase corrections to the transverse analyzing power AN(t) in high energy forward proton-proton scattering

Coulomb phase corrections to the transverse analyzing power AN(t) in high energy forward proton-proton scattering

Absorptive corrections to the electromagnetic form factor in high-energy elastic proton-proton scattering

Polarization Measurements of p↑ and 3He↑ Beams at RHIC and Future EIC Using the Polarized Atomic Hydrogen Gas Jet Target

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