Measurement of the ${}^{1}H$($\vec{\gamma }$, $\vec{p}$)${\pi }^0$ reaction using a novel nucleon spin polarimeter

Abstract

We report the first large-acceptance measurement of polarization transfer from a polarized photon beam to a recoiling nucleon, pioneering a novel polarimetry technique with wide application to future nuclear and hadronic physics experiments. The commissioning measurement of polarization transfer in the ${}^{1}H$($\vec{\gamma }$,$\vec{p}$)${\pi }^0$ reaction in the range $0.4<E_{\gamma }<1.4$ GeV is highly selective regarding the basic parameterizations used in partial wave analyses to extract the nucleon excitation spectrum. The new data strongly favor the recently proposed Chew-Mandelstam formalism.

6 pages, 4 figures

References in corpus (5)

• Ab-initio Determination of Light Hadron Masses
• Unitary Isobar Model - MAID2007
• Updated analysis of NN elastic scattering to 3 GeV
• Upgrade of the Glasgow photon tagging spectrometer for Mainz MAMI-C
• Study of the gamma p --> pi0 pi0 p reaction with the Crystal Ball/TAPS at the Mainz

Cited by in corpus (16)

• Photocouplings at the Pole from Pion Photoproduction
• Light Baryon Spectroscopy
• Photoproduction Reactions and Non-Strange Baryon Spectroscopy
• Measurement of pi^0 photoproduction on the proton at MAMI C
• The complete experiment for photoproduction of pseudoscalar mesons in a truncated partial wave analysis
• Photoproduction of pi0-mesons off neutrons in the nucleon resonance region
• Cross Section for $\gamma n\to {\pi }^{0}n$ measured at Mainz/A2
• First measurement of the polarization observable $E$ and helicity-dependent cross sections in single ${\pi }^0$ photoproduction from quasi-free nucleons
• Double-polarization observable G in neutral-pion photoproduction off the proton
• Determining the dominant partial wave contributions from angular distributions of single- and double-polarization observables in pseudoscalar meson photoproduction
• Neutral pion photoproduction on the nucleon in a chiral quark model
• Photoproduction of {\boldmath{${\pi }^0$}} Mesons off Protons and Neutrons in the Second and Third Nucleon Resonance Region
• Comprehensive Study of Observables in Compton Scattering on the Nucleon
• Moravcsik's theorem on complete sets of polarization observables reexamined
• Photon asymmetry measurements of $\overrightarrow{\gamma }\mathrm{p}\to {\pi }^0\mathrm{p}$ for E${}_{\gamma }$=320$-$650 MeV
• New graphical criterion for the selection of complete sets of polarization observables and its application to single-meson photoproduction as well as electroproduction