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Measurement of the helicity-dependent total cross-section for the \( \gamma\)n \( \rightarrow\) p\( \pi^{-}_{}\) \( \pi^{0}_{}\) reaction

  • GDH and A2 Collaborations
  • J. Ahrens
  • S. Altieri
  • J. R. M. Annand
  • H. -J. Arends
  • R. Beck
  • M. A. Blackston
  • C. Bradtke
  • A. Braghieri
  • N. d’Hose
  • H. Dutz
  • A. Fix
  • E. Heid
  • O. Jahn
  • F. Klein
  • R. Kondratiev
  • M. Lang
  • V. Lisin
  • M. Martinez-Fabregate
  • J. C. McGeorge
  • W. Meyer
  • A. Panzeri
  • P. PedroniEmail author
  • T. Pinelli
  • D. Protopopescu
  • G. Reicherz
  • Ch. Rohlof
  • G. Rosner
  • T. Rostomyan
  • D. Ryckbosch
  • G. Tamas
  • A. Thomas
  • H. R. Weller
Regular Article - Experimental Physics

Abstract.

The helicity dependence of the total cross-section for the \( \gamma\) n \( \rightarrow\) p \( \pi^{-}_{}\) \( \pi^{0}_{}\) reaction has been measured for the first time at incident photon energies from 450 to 800MeV. The measurement was performed with the large-acceptance detector DAPHNE at the tagged photon beam facility of the MAMI accelerator in Mainz. Both the measured unpolarized and the helicity-dependent observables are not well described by the existing theoretical models.

Keywords

Spectator Model Incident Photon Energy Target Polarization Fermi Motion Total Helicity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© SIF, Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • GDH and A2 Collaborations
  • J. Ahrens
    • 7
  • S. Altieri
    • 9
    • 10
  • J. R. M. Annand
    • 6
  • H. -J. Arends
    • 7
  • R. Beck
    • 7
  • M. A. Blackston
    • 3
  • C. Bradtke
    • 2
  • A. Braghieri
    • 9
  • N. d’Hose
    • 5
  • H. Dutz
    • 2
  • A. Fix
    • 11
  • E. Heid
    • 7
  • O. Jahn
    • 7
  • F. Klein
    • 2
  • R. Kondratiev
    • 8
  • M. Lang
    • 7
  • V. Lisin
    • 8
  • M. Martinez-Fabregate
    • 7
  • J. C. McGeorge
    • 6
  • W. Meyer
    • 1
  • A. Panzeri
    • 9
    • 10
  • P. Pedroni
    • 9
    Email author
  • T. Pinelli
    • 9
    • 10
  • D. Protopopescu
    • 6
  • G. Reicherz
    • 1
  • Ch. Rohlof
    • 2
  • G. Rosner
    • 6
  • T. Rostomyan
    • 4
    • 9
  • D. Ryckbosch
    • 4
  • G. Tamas
    • 7
  • A. Thomas
    • 7
  • H. R. Weller
    • 3
  1. 1.Insitut für ExperimentalphysikRuhr-Universität BochumBochumGermany
  2. 2.Physikalisches InstitutUniversität BonnBonnGermany
  3. 3.Department of PhysicsDuke UniversityDurhamUSA
  4. 4.Subatomaire en StralingsfysicaUniversiteit GentGentBelgium
  5. 5.CEA SaclayDSM/DAPNIA/SPhNGif-sur-Yvette CedexFrance
  6. 6.SUPA, School of Physics and AstronomyUniversity of GlasgowGlasgowUK
  7. 7.Institut für KernphysikUniversität MainzMainzGermany
  8. 8.INRAcademy of ScienceMoscowRussia
  9. 9.INFN, Sezione di PaviaPaviaItaly
  10. 10.Dipartimento di Fisica Nucleare e TeoricaUniversità di PaviaPaviaItaly
  11. 11.Laboratory of Mathematical PhysicsTomsk Polytechnic UniversityTomskRussia

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