Measurement of the single polarization observables I{sup c} and I{sup s} in {pi}{sup 0{eta}} photoproduction

Journal Article · Thu Aug 05 04:00:00 EDT 2010 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3483398· OSTI ID:21426461

Gutz, E ^[1]

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1. Helmholtz-Institut fuer Strahlen-und Kernphysik, Universitaet Bonn (Germany)

Meson photoproduction off the nucleon is a key tool in order to understand the structure of baryons and their excitation spectrum. Especially in the regime of high-lying resonances the photoproduction of multi-meson final states is of increasing importance, given that the cross sections for such processes exceed those for single-meson production. Additionally it gives a handle on sequential decays of such resonances via e.g. the {Delta}(1232) or the S{sub 11}(1535) in the intermediate state. For a complete understanding of the processes involved, the measurement not only of unpolarized cross sections but also of polarization observables is mandatory. With the Crystal Barrel/TAPS experiment, located at the ELSA accelerator facility in Bonn, it was possible to determine such observables using a linearly polarized photon beam impinging on a liquid hydrogen target. The beam asymmetries I{sup c} and I{sup s} are presented for the reaction gp {gamma}{sup {yields}p{yields}}p{pi}{sup 0{eta}}. The latter is a feature exclusive to the acoplanar kinematics of multi-meson final states and has been measured for the first time.

• OSTI ID: 21426461
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1257; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCELERATOR FACILITIES
ACCELERATORS
ASYMMETRY
BARYONS
BASIC INTERACTIONS
BOSONS
CROSS SECTIONS
DECAY
DELTA BARYONS
DELTA-1232 BARYONS
ELECTROMAGNETIC INTERACTIONS
ELECTROSTATIC ACCELERATORS
ELEMENTARY PARTICLES
ENERGY-LEVEL TRANSITIONS
ETA MESONS
EXCITATION
FERMIONS
HADRONS
INTERACTIONS
INTERMEDIATE STATE
MEASURING INSTRUMENTS
MESONS
MULTIPARTICLE SPECTROMETERS
N BARYONS
N*BARYONS
N-1535 BARYONS
NUCLEONS
PARTICLE DECAY
PARTICLE IDENTIFICATION
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PHOTON-BARYON INTERACTIONS
PHOTON-HADRON INTERACTIONS
PHOTON-NUCLEON INTERACTIONS
PHOTON-PROTON INTERACTIONS
PHOTOPRODUCTION
PIONS
PIONS NEUTRAL
POLARIZATION
PSEUDOSCALAR MESONS
RESONANCE PARTICLES
SPECTROMETERS