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Resonance-like coherent production of a pion pair in the reaction \(pd \rightarrow pd \pi\pi\) in the GeV region

  • V. I. Komarov
  • D. Tsirkov
  • T. Azaryan
  • Z. Bagdasarian
  • B. Baimurzinova
  • S. Barsov
  • S. Dymov
  • R. Gebel
  • M. Hartmann
  • A. Kacharava
  • A. Khoukaz
  • A. Kulikov
  • A. Kunsafina
  • V. Kurbatov
  • Zh. Kurmanaliyev
  • B. Lorentz
  • G. Macharashvili
  • D. Mchedlishvili
  • S. Merzliakov
  • S. Mikirtytchiants
  • M. Nioradze
  • H. Ohm
  • F. Rathmann
  • V. Serdyuk
  • V. Shmakova
  • H. Ströher
  • S. Trusov
  • Yu. Uzikov
  • Yu. Valdau
  • C. Wilkin
Regular Article - Experimental Physics
  • 17 Downloads

Abstract.

The reaction \(p + d \rightarrow p + d + X\) was studied at 0.8-2.0 GeV proton beam energies with the ANKE magnetic spectrometer at the COSY synchrotron storage ring. The proton-deuteron pairs emerging with high momenta, 0.6-1.8 GeV/c, were detected at small angles with respect to the proton beam. Distribution over the reaction missing mass \(M_{x}\) reveals a local enhancement near the threshold of the pion pair production specific for the so-called ABC effect. The enhancement has a structure of a narrow bump placed above a smooth continuum. The invariant mass of the \(d\pi\pi\) system in this enhancement region exhibits a resonance-like peak at \(M_{d\pi\pi}\approx 2.36\) GeV/c2 with the width \(\Gamma \approx 0.10\) GeV/c2. A possible interpretation of these features is discussed.

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Copyright information

© SIF, Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • V. I. Komarov
    • 1
  • D. Tsirkov
    • 1
  • T. Azaryan
    • 1
  • Z. Bagdasarian
    • 2
    • 3
  • B. Baimurzinova
    • 4
    • 5
  • S. Barsov
    • 6
  • S. Dymov
    • 1
    • 2
  • R. Gebel
    • 2
  • M. Hartmann
    • 2
  • A. Kacharava
    • 2
  • A. Khoukaz
    • 7
  • A. Kulikov
    • 1
  • A. Kunsafina
    • 1
    • 4
    • 5
  • V. Kurbatov
    • 1
  • Zh. Kurmanaliyev
    • 1
    • 4
    • 5
  • B. Lorentz
    • 2
  • G. Macharashvili
    • 3
  • D. Mchedlishvili
    • 2
    • 3
  • S. Merzliakov
    • 2
  • S. Mikirtytchiants
    • 2
    • 6
  • M. Nioradze
    • 3
  • H. Ohm
    • 2
  • F. Rathmann
    • 2
  • V. Serdyuk
    • 2
  • V. Shmakova
    • 1
  • H. Ströher
    • 2
  • S. Trusov
    • 2
    • 8
  • Yu. Uzikov
    • 1
    • 9
    • 10
  • Yu. Valdau
    • 2
    • 6
  • C. Wilkin
    • 11
  1. 1.Laboratory of Nuclear ProblemsJoint Institute for Nuclear ResearchDubnaRussia
  2. 2.Institut für KernphysikForschungszentrum JülichJülichGermany
  3. 3.High Energy Physics InstituteTbilisi State UniversityTbilisiGeorgia
  4. 4.Institute of Nuclear PhysicsAlmatyKazakhstan
  5. 5.L.N. Gumilyov Eurasian National UniversityAstanaKazakhstan
  6. 6.St. Petersburg Nuclear Physics InstituteNRC Kurchatov InstituteGatchinaRussia
  7. 7.Institut für KernphysikUniversität MünsterMünsterGermany
  8. 8.Skobeltsyn Institute of Nuclear PhysicsLomonosov Moscow State UniversityMoscowRussia
  9. 9.Dubna State UniversityDubnaRussia
  10. 10.Department of PhysicsMoscow State UniversityMoscowRussia
  11. 11.Physics and Astronomy DepartmentUCLLondonUK

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