Evidence for W-exchange in charmed baryon decays

H. Albrecht, T. Hamacher, R. P. Hofmann, T. Kirchhoff, R. Mankel, A. Nau, S. Nowak, H. Schröder, H. D. Schulz, M. Walter, R. Wurth, C. Hast, H. Kapitza, H. Kolanoski, A. Kosche, A. Lange, A. Lindner, M. Schieber, T. Siegmund, B. SpaanH. Thurn, D. Töpfer, D. Wegener, P. Eckstein, K. R. Schubert, R. Schwierz, R. Waldi, K. Reim, H. Wegener, P. Eckmanm, H. Kuipers, O. Mai, R. Mundt, T. Oest, R. Reiner, W. Schmidt-Parzefall, U. Becker, J. Stiewe, S. Werner, K. Ehret, W. Hofmann, A. Hüpper, K. T. Knöpfle, J. Spengler, C. E.K. Charlesworth, P. Krieger, D. B. MacFarlane, J. D. Prentice, P. R.B. Saull, S. C. Seidel, K. Tzamariudaki, R. G. Van de Water, T. S. Yoon, C. Frankl, D. Reßing, M. Schmidtler, M. Schneider, S. Weseler, G. Kernel, P. Križan, E. Križnič, T. Podobnik, T. Živko, V. Balagura, I. Belyaev, S. Chechelnitsky, M. Danilov, A. Droutskoy, Yu Gershtein, A. Golutvin, I. Korolko, G. Kostina, D. Litvintsev, V. Lubimov, P. Pakhlov, S. Semenov, A. Snizhko, I. Tichomirov, Yu Zaitsev

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6 Scopus citations


Using the detector ARGUS at the e+e- storage ring DORIS II at DESY, we have observed the decays Λc+ → Ξ-K+π+ and Λc+ → Ξ*0K+ and obtained evidence for the decay Ξc0 → ΛKs0. All three of these decays are of interest as they provide information about W-exchange processes. The products of cross sections and branching ratios for Λc+ → Ξ-K+π+ and Λc+ → Ξ*0K+ are (1.7±0.3±0.3) pb and (0.6±0.2±0.1) pb, respectively, which implies that (35±17) % of the Ξ-K+π+ final state is generated through a two-body decay via intermediate W-exchange. The product of production cross section and branching ratio for Ξc0 → Λ Ks0 is (2.1 ± 1.0 ± 0.6) pb.

Original languageEnglish (US)
Pages (from-to)397-401
Number of pages5
JournalPhysics Letters B
Issue number1-4
StatePublished - Jan 12 1995

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


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