Publication Title

Physical Review C

Publication Date

2002

Document Type

Article

DOI

10.1103/PhysRevC.66.034614

Keywords

neutral pion photoproduction, polarization, recoil proton polarization

Disciplines

Physics

Abstract

We present measurements of the recoil proton polarization for the 1H(y,p) π 0 reaction for 0 π c.m. =60° –135° and for photon energies up to 4.1 GeV. These are the first data in this reaction for polarization transfer with circularly polarized photons. Various theoretical models are compared with the results. No evidence for hadron helicity conservation is observed. Models that employ factorization are not favored. It appears from the strong angular dependence of the induced polarization at photon energies of 2.5 and 3.1 GeV that a relatively high spin resonance or background amplitude might exist in this energy region.

Comments

Copyright 2002, American Physical Society.


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