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Measurement of the LT-asymmetry in πelectroproduction at the energy of the Δ(1232)-resonance

  • D. Elsner
  • A. Süle
  • P. Barneo
  • P. Bartsch
  • D. Baumann
  • J. Bermuth
  • R. Böhm
  • D. Bosnar
  • M. Ding
  • M. Distler
  • D. Drechsel
  • I. Ewald
  • J. Friedrich
  • J. M. Friedrich
  • S. Grözinger
  • P. Jennewein
  • S. Kamalov
  • F. H. Klein
  • M. Kohl
  • K. W. Krygier
  • H. Merkel
  • P. Merle
  • U. Müller
  • R. Neuhausen
  • Th. Pospischil
  • M. Potokar
  • G. Rosner
  • H. Schmieden
  • M. Seimetz
  • O. Strähle
  • L. Tiator
  • Th. Walcher
  • M. Weis
Hadron Physics

Abstract.

The reaction p(e, e'p0 has been studied at Q 2 = 0.2 (GeV/c)2 in the region of W = 1232MeV. From measurements left and right of \( \vec{q}\,\), cross-section asymmetries ρLT have been obtained in forward kinematics ρLT(\( \theta_{{\pi^0}}^{{cm}}\) = 20°) = (- 11.68±2.36stat±2.36sys) and backward kinematics ρLT(\( \theta_{{\pi^0}}^{{cm}}\) = 160°) = (12.18±0.27stat±0.82sys) π0. Multipole ratios \( \Re\){S 1+ * M 1+}/| M 1+|2 and \( \Re\){S 0+ * M 1+}/| M 1+|2 were determined in the framework of the MAID2003 model. The results are in agreement with older data. The unusally strong negative \( \Re\){S 0+ * M 1+}/| M 1+|2 required to bring also the result of Kalleicher et al. in accordance with the rest of the data is almost excluded.

PACS.

13.60.Le Meson production 13.40.-f Electromagnetic processes and properties 14.20.Gk Baryon resonances with S = 0 

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Copyright information

© Società Italiana di Fisica and Springer-Verlag 2006

Authors and Affiliations

  • D. Elsner
    • 1
  • A. Süle
    • 1
  • P. Barneo
    • 2
  • P. Bartsch
    • 3
  • D. Baumann
    • 3
  • J. Bermuth
    • 3
  • R. Böhm
    • 3
  • D. Bosnar
    • 3
  • M. Ding
    • 3
  • M. Distler
    • 3
  • D. Drechsel
    • 3
  • I. Ewald
    • 3
  • J. Friedrich
    • 3
  • J. M. Friedrich
    • 3
  • S. Grözinger
    • 3
  • P. Jennewein
    • 3
  • S. Kamalov
    • 3
  • F. H. Klein
    • 1
  • M. Kohl
    • 4
  • K. W. Krygier
    • 3
  • H. Merkel
    • 3
  • P. Merle
    • 3
  • U. Müller
    • 3
  • R. Neuhausen
    • 3
  • Th. Pospischil
    • 3
  • M. Potokar
    • 5
  • G. Rosner
    • 3
  • H. Schmieden
    • 1
  • M. Seimetz
    • 3
  • O. Strähle
    • 3
  • L. Tiator
    • 3
  • Th. Walcher
    • 3
  • M. Weis
    • 3
  1. 1.Physikalisches InstitutRheinische Friedrich-Wilhelms-UniversitätBonnGermany
  2. 2.NIKHEFAmsterdamThe Netherlands
  3. 3.Institut für KernphysikJohannes Gutenberg-UniversitätMainzGermany
  4. 4.Institut für KernphysikTechnische Universität DarmstadtDarmstadtGermany
  5. 5.Institut Jožef StefanUniversity of LjubljanaLjubljanaSlovenia

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