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Measurements of the spin rotation parameter A in the elastic pion-proton scattering in the D13(1700) resonance region

  • I.G. Alekseev
  • N.A. Bazhanov
  • Yu.A. Beloglazov
  • P.E. Budkovsky
  • E.I. Bunyatova
  • V.P. Kanavets
  • A.I. Kovalev
  • L.I. Koroleva
  • S.P. Kruglov
  • B.V. Morozov
  • V.M. Nesterov
  • D.V. Novinsky
  • V.V. Ryltsov
  • V.A. Shchedrov
  • A.D. Sulimov
  • V.V. Sumachev
  • D.N. Svirida
  • V.Yu. Trautman
  • V.V. Zhurkin

Abstract.

The spin rotation parameters A and R were measured for the elastic pion-proton scattering by the PNPI-ITEP collaboration in the D13(1700) resonance region. The main goal of the experimental program is to resolve the current partial-wave analyses (PWA) uncertainties. Simultaneously with A and R the polarization parameter P was measured with the purpose to improve the experimental database and estimate systematic errors. The constraint which demands a smooth energy dependence of all π-p transverse amplitude zeros in the complex plane together with the new experimental data on A parameter can lead to the conclusion that the Barrelet branch of “zero trajectories" is chosen improperly in PWA of the Carnegie-Mellon-Lawrence-Berkely-Laboratory groups at the range of the pion beam momentum near 1.0 GeV/c. The setup included a longitudinally polarized proton target with superconductive magnet, multiwire spark chambers and carbon polarimeter with thick filter. The experiment was performed at the ITEP proton synchrotron, Moscow.

PACS. 13.75.Gx Pion-baryon interactions – 13.85.Dz Elastic scattering – 13.88.+e Polarization in interactions and scattering – 14.20.Gk Baryon resonances with S = 0 

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Copyright information

© Società Italiana di Fisica and Springer-Verlag 2001

Authors and Affiliations

  • I.G. Alekseev
    • 1
  • N.A. Bazhanov
    • 2
  • Yu.A. Beloglazov
    • 3
  • P.E. Budkovsky
    • 1
  • E.I. Bunyatova
    • 2
  • V.P. Kanavets
    • 1
  • A.I. Kovalev
    • 3
  • L.I. Koroleva
    • 1
  • S.P. Kruglov
    • 3
  • B.V. Morozov
    • 1
  • V.M. Nesterov
    • 1
  • D.V. Novinsky
    • 3
  • V.V. Ryltsov
    • 1
  • V.A. Shchedrov
    • 3
  • A.D. Sulimov
    • 1
  • V.V. Sumachev
    • 3
  • D.N. Svirida
    • 1
  • V.Yu. Trautman
    • 3
  • V.V. Zhurkin
    • 1
  1. 1.Institute for Theoretical and Experimental Physics, Moscow, 117259, RussiaRU
  2. 2.Joint Institute for Nuclear research, Dubna, Moscow district, 141980, RussiaRU
  3. 3.Petersburg Nuclear Physics Institute, Gatchina, Leningrad district, 188300, RussiaRU

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