Beam-Helicity Asymmetries in Double Pion Photoproduction off the Proton - INSPIRE

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Beam-Helicity Asymmetries in Double Pion Photoproduction off the Proton

Collaborations

•

D. Krambrich
(
- Mainz U., Inst. Kernphys.
)

Jul, 2009

5 pages

Published in:

Phys.Rev.Lett. 103 (2009) 052002

e-Print:

0907.0358 [nucl-ex]

DOI:

10.1103/PhysRevLett.103.052002

View in:

ADS Abstract Service

reference search52 citations

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Abstract: (arXiv)

Beam-helicity asymmetries have been measured at the MAMI accelerator in Mainz in the three isospin channels

\vec{\gamma}p\to \pi^{+}\pi^0n

,

\vec{\gamma}p\to \pi^{0}\pi^0p

and

\vec{\gamma}p\to \pi^{+}\pi^{-}p

. The circularly polarized photons, produced from bremsstrahlung of longitudinally polarized electrons, were tagged with the Glasgow magnetic spectrometer. Charged pions and the decay photons of

\pi^0

mesons were detected in a

~4\pi

electromagnetic calorimeter which combined the Crystal Ball detector with the TAPS detector. The precisely measured asymmetries are very sensitive to details of the production processes and are thus key observables in the modeling of the reaction dynamics.

13.60.Le
14.40.Aq
25.20.Lj
14.20.Gk
photon p: exclusive reaction
photon p: tagged beam: polarized beam
pi: photoproduction
calorimeter: electromagnetic
pi0: radiative decay
helicity: asymmetry

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