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

Skorodko, Tatiana (author)
Tuebingen University, Physikalisches Institut,WASA-at-COSY
Bashkanov, Mikhail (author)
Tuebingen University, Physikalisches Institut,WASA-at-COSY
Clement, Heinz (author)
Tuebingen University, Physikalisches Institut,WASA-at-COSY
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Doroshkevich, Evgueny (author)
Tuebingen University, Physikalisches Institut,WASA-at-COSY
Perez del Rio, Elena (author)
Tuebingen University, Physikalisches Institut,WASA-at-COSY
Pricking, Annette (author)
Tuebingen University, Physikalisches Institut,WASA-at-COSY
Wagner, Gerhard J. (author)
Tuebingen University, Physikalisches Institut,WASA-at-COSY
Adlarson, Patrik (author)
Uppsala universitet,Kärnfysik,WASA-at-COSY
Calen, Hans (author)
Uppsala universitet,Kärnfysik,WASA-at-COSY
Fransson, Kjell (author)
Uppsala universitet,Kärnfysik,WASA-at-COSY
Gullström, Carl-Oscar (author)
Uppsala universitet,Kärnfysik,WASA-at-COSY
Heijkenskjöld, Lena (author)
Uppsala universitet,Kärnfysik,WASA-at-COSY
Höistad, Bo (author)
Uppsala universitet,Kärnfysik,WASA-at-COSY
Johansson, Tord (author)
Uppsala universitet,Kärnfysik,WASA-at-COSY
Kupsc, Andrzej (author)
Uppsala universitet,Kärnfysik,WASA-at-COSY
Marciniewski, Pawel (author)
Uppsala universitet,Kärnfysik,WASA-at-COSY
Plucinski, Pawel (author)
Uppsala universitet,Kärnfysik,WASA-at-COSY
Pszczel, Damian (author)
Uppsala universitet,Kärnfysik,WASA-at-COSY
Pyszniak, Andrzej (author)
Uppsala universitet,Kärnfysik,WASA-at-COSY
Redmer, Christoph Florian (author)
Uppsala universitet,Kärnfysik,WASA-at-COSY
Wolke, Magnus (author)
Uppsala universitet,Kärnfysik,WASA-at-COSY
Zlomanczuk, Jozef (author)
Uppsala universitet,Kärnfysik,WASA-at-COSY
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 (creator_code:org_t)
Les Ulis Cedex, France : EDP Sciences, 2012
2012
English.
In: Proceedings of 12th International Workshop on Production, properties and interaction of mesons (MESON 2012). - Les Ulis Cedex, France : EDP Sciences. ; , s. 09033-
Related links:
http://www.epj-confe...
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https://urn.kb.se/re...
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  • Conference paper (other academic/artistic)
Abstract Subject headings
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  • 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

NATURVETENSKAP  -- Fysik -- Subatomär fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Subatomic Physics (hsv//eng)

Keyword

Nuclear Physics
Kärnfysik

Publication and Content Type

vet (subject category)
kon (subject category)

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