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  • Skorodko, TatianaTuebingen University, Physikalisches Institut,WASA-at-COSY (author)

Measurement of the p n ---> p p pi0 pi- reaction in search of the ABC resonance

  • Article/chapterEnglish2012

Publisher, publication year, extent ...

  • Les Ulis Cedex, France :EDP Sciences,2012
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:uu-196967
  • https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-196967URI

Supplementary language notes

  • Language:English
  • Summary in:English

Part of subdatabase

Classification

  • Subject category:vet swepub-contenttype
  • Subject category:kon swepub-publicationtype

Notes

  • With pd collisions at T_p = 1.2 GeV exclusive measurements of the quasi-free pn -> pppi^0pi^- reaction have been carried out. Using the WASA detector setup at COSY total and differential cross sections have been obtained for the energy region &radics = 2.35 - 2.48 GeV. Though this includes the region of the ABC effect and its associated resonance structure, no low-mass enhancement (ABC effect) is found in the pi^0pi^--invariant mass spectrum - in agreement with the constraint from Bose statistics demanding the isovector pion pair to be in relative p-wave. Conventional calculations including t-channel processes for Roper, Delta(1600) and DeltaDelta excitations and their decays, which are well-known from the study of the two-pion production in pp collisions, provide a reasonable description of the data at high energies, but fall low at low energies. From this we conclude that a large contribution from a so far unknown isoscalar low-energy process is missed in the calculations. Inclusion of the ABC resonance at m = 2.37 GeV with Gamma = 70 MeV and I(J^P) = 0(3^+), which was recently observed in the pn -> dpi^0pi^0 reaction, leads to a much improved description of the data at low energies.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Bashkanov, MikhailTuebingen University, Physikalisches Institut,WASA-at-COSY (author)
  • Clement, HeinzTuebingen University, Physikalisches Institut,WASA-at-COSY (author)
  • Doroshkevich, EvguenyTuebingen University, Physikalisches Institut,WASA-at-COSY (author)
  • Perez del Rio, ElenaTuebingen University, Physikalisches Institut,WASA-at-COSY (author)
  • Pricking, AnnetteTuebingen University, Physikalisches Institut,WASA-at-COSY (author)
  • Wagner, Gerhard J.Tuebingen University, Physikalisches Institut,WASA-at-COSY (author)
  • Adlarson, PatrikUppsala universitet,Kärnfysik,WASA-at-COSY(Swepub:uu)patad399 (author)
  • Calen, HansUppsala universitet,Kärnfysik,WASA-at-COSY(Swepub:uu)hanscale (author)
  • Fransson, KjellUppsala universitet,Kärnfysik,WASA-at-COSY(Swepub:uu)kjelfran (author)
  • Gullström, Carl-OscarUppsala universitet,Kärnfysik,WASA-at-COSY(Swepub:uu)cargu704 (author)
  • Heijkenskjöld, LenaUppsala universitet,Kärnfysik,WASA-at-COSY(Swepub:uu)lenhe965 (author)
  • Höistad, BoUppsala universitet,Kärnfysik,WASA-at-COSY(Swepub:uu)bohoista (author)
  • Johansson, TordUppsala universitet,Kärnfysik,WASA-at-COSY(Swepub:uu)tordjoha (author)
  • Kupsc, AndrzejUppsala universitet,Kärnfysik,WASA-at-COSY(Swepub:uu)andrkups (author)
  • Marciniewski, PawelUppsala universitet,Kärnfysik,WASA-at-COSY(Swepub:uu)pawemarc (author)
  • Plucinski, PawelUppsala universitet,Kärnfysik,WASA-at-COSY(Swepub:uu)pawpl866 (author)
  • Pszczel, DamianUppsala universitet,Kärnfysik,WASA-at-COSY(Swepub:uu)damps525 (author)
  • Pyszniak, AndrzejUppsala universitet,Kärnfysik,WASA-at-COSY(Swepub:uu)andpy741 (author)
  • Redmer, Christoph FlorianUppsala universitet,Kärnfysik,WASA-at-COSY (author)
  • Wolke, MagnusUppsala universitet,Kärnfysik,WASA-at-COSY(Swepub:uu)mawol031 (author)
  • Zlomanczuk, JozefUppsala universitet,Kärnfysik,WASA-at-COSY(Swepub:uu)jozezlom (author)
  • Tuebingen University, Physikalisches InstitutWASA-at-COSY (creator_code:org_t)

Related titles

  • In:Proceedings of 12th International Workshop on Production, properties and interaction of mesons (MESON 2012)Les Ulis Cedex, France : EDP Sciences, s. 09033-

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