pi(0)pi(0) Production in proton-proton collisions at T-p=1.4 GeV The WASA-at-COSY Collaboration

WASA-At-COSY Collaboration, P. Adlarson, C. Adolph, W. Augustyniak, M. Bashkanov, T. Bednarski, F. S. Bergmann, M. Berlowski, H. Bhatt, K. -T. Brinkmann, M. Buescher, H. Calen, H. Clement, D. Coderre, E. Czerwinski, E. Doroshkevich, R. Engels, W. Erven, W. Eyrich, P. FedoretsK. Foehl, K. Fransson, F. Goldenbaum, P. Goslawski, K. Grigoryev, C. -O. Gullstrom, L. Heijkenskjold, J. Heimlich, V. Hejny, F. Hinterberger, M. Hodana, B. Hoistad, M. Jacewicz, M. Janusz, A. Jany, B. R. Jany, L. Jarczyk, T. Johansson, B. Kamys, G. Kemmerling, O. Khakimova, A. Khoukaz, S. Kistryn, J. Klaja, H. Kleines, B. Klos, F. Kren, W. Krzemien, P. Kulessa, A. Kupsc, K. Lalwani

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Abstract

The reaction pp -> pp pi(0)pi(0) has been investigated at a beam energy of 1.4 GeV using the WASA-at-COSY facility. The total cross section is found to be (324 +/- 21(systematic) +/- 58(normalization)) mu b. In order to study the production mechanism, differential kinematic distributions have been evaluated. The differential distributions indicate that both initial state protons are excited into intermediate Delta(1232) resonances, each decaying into a proton and a single pion, thereby producing the pion pair in the final state. No significant contribution of the Roper resonance N*(1440) via its decay into a proton and two pions is found. (C) 2011 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)256-262
Number of pages7
JournalPhysics Letters B
Volume706
Issue number4-5
DOIs
Publication statusPublished - 5 Jan 2012

Keywords

  • 2-PION PRODUCTION
  • ROPER RESONANCE
  • PION PRODUCTION
  • CROSS-SECTIONS
  • EXCITATION
  • MODEL
  • PP

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