Charge symmetry breaking in dd -> He-4 pi(0) with WASA-at-COSY

P. Adlarson, W. Augustyniak, W. Bardan, M. Bashkanov, F. S. Bergmann, M. Berlowski, H. Bhatt, A. Bondar, M. Buescher, H. Calen, I. Ciepal, H. Clement, D. Coderre, E. Czerwinski, K. Demmich, E. Doroshkevich, R. Engels, A. Erven, W. Erven, W. EyrichP. Fedorets, K. Foehl, K. Fransson, F. Goldenbaum, P. Goslawski, A. Goswami, K. Grigoryev, C. -O. Gullstrom, C. Hanhart, F. Hauenstein, L. Heijkenskjold, V. Hejny*, B. Hoistad, N. Huesken, L. Jarczyk, T. Johansson, B. Kamys, G. Kemmerling, F. A. Khan, A. Khoukaz, D. A. Kirillov, S. Kistryn, H. Kleines, B. Klos, W. Krzemien, P. Kulessa, A. Kupsc, A. Kuzmin, K. Lalwani, D. Lersch, B. Lorentz, A. Magiera, R. Maier, P. Marciniewski, B. Marianski, M. Mikirtychiants, H. -P. Morsch, P. Moskal, H. Ohm, I. Ozerianska, E. Perez del Rio, N. M. Piskunov, P. Podkopal, D. Prasuhn, A. Pricking, D. Pszczel, K. Pyszw, A. Pyszniak, C. F. Redmer, J. Ritman, A. Roy, Z. Rudy, S. Sawant, S. Schadmand, T. Sefzick, V. Serdyuk, B. Shwartz, R. Siudak, T. Skorodko, M. Skurzok, J. Smyrski, V. Sopov, R. Stassen, J. Stepaniak, E. Stephan, G. Sterzenbach, H. Stockhorst, H. Stroher, A. Szczurek, A. Taschner, A. Trzcinski, R. Varma, M. Wolke, A. Wronska, P. Wustner, P. Wurm, A. Yamamoto, L. Yurev, J. Zabierowski, M. J. Zielinski, A. Zink, J. Zlomanczuk, P. Zupranski, M. Zurek

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Charge symmetry breaking (CSB) observables are a suitable experimental tool to examine effects induced by quark masses on the nuclear level. Previous high precision data from TRIUMF and IUCF are currently used to develop a consistent description of CSB within the framework of chiral perturbation theory. In this work the experimental studies on the reaction dd -> He-4 pi(0) have been extended towards higher excess energies in order to provide information on the contribution of p-waves in the final state. For this, an exclusive measurement has been carried out at a beam momentum of p(d) = 1.2GeV/c using the WASA-at-COSY facility. The total cross section amounts to sigma(tot) =(118 +/- 18(stat) +/- 13(sys) +/- 8(ext)) p band first data on the differential cross section are consistent with s-wave pion production. (C) 2014 The Authors. Published by Elsevier B.V.

Original languageEnglish
Pages (from-to)44-49
Number of pages6
JournalPhysics Letters B
Volume739
DOIs
Publication statusPublished - 12 Dec 2014

Keywords

  • Charge symmetry breaking
  • Deuteron-deuteron interactions
  • Pion production
  • CHIRAL PERTURBATION-THEORY
  • PION-NUCLEON SCATTERING
  • ISOSPIN BREAKING
  • PRECISION CALCULATION
  • PI(-)D SCATTERING
  • MASS DIFFERENCE
  • QUARK MASSES
  • N SCATTERING
  • SUM-RULE
  • THRESHOLD

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