First exclusive measurements of the K- pp state populated in the pp → K+ Λp reaction at 2.85 GeV

T. Yamazaki, P. Kienle, K. Suzuki, M. Maggiora, M. Alexeev, F. Balestra, Y. Bedfer, R. Bertini, L. C. Bland, A. Brenschede, F. Brochard, M. P. Bussa, M. Chiosso, Seonho Choi, M. L. Colantoni, R. Dressler, M. Dzemidzic, J. Cl Faivre, L. Ferrero, J. ForyciarzI. Fröhlich, V. Frolov, R. Garfagnini, A. Grasso, S. Heinz, W. W. Jacobs, W. Kühn, A. Maggiora, D. Panzieri, H. W. Pfaff, G. Pontecorvo, A. Popov, J. Ritman, P. Salabura, V. Tchalyshev, F. Tosello, S. E. Vigdor, G. Zosi

Research output: Contribution to journalArticle

14 Scopus citations


We have analyzed data of the DISTO experiment on the exclusive pp → K+ Λp process at Tp = 2.85 GeV to search for a K-pp (≡ X) nuclear bound state to be formed in the pp → K+ + X reaction. The deviation spectra of the K+ missing-mass ΔM (K+) and Λp invariant-mass M(Λp) with selection of large-angle proton emission revealed a structure with MX = 2265 ±2 MeV/c2 and ΓX = 118 ±8 MeV.

Original languageEnglish (US)
Pages (from-to)181-187
Number of pages7
JournalHyperfine Interactions
Issue number1-3
StatePublished - Aug 28 2009
Externally publishedYes


  • Kaon condensation
  • K̄ nuclei
  • Strange dibaryon
  • Super-strong nuclear force

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Nuclear and High Energy Physics
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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    Yamazaki, T., Kienle, P., Suzuki, K., Maggiora, M., Alexeev, M., Balestra, F., Bedfer, Y., Bertini, R., Bland, L. C., Brenschede, A., Brochard, F., Bussa, M. P., Chiosso, M., Choi, S., Colantoni, M. L., Dressler, R., Dzemidzic, M., Faivre, J. C., Ferrero, L., ... Zosi, G. (2009). First exclusive measurements of the K- pp state populated in the pp → K+ Λp reaction at 2.85 GeV. Hyperfine Interactions, 193(1-3), 181-187.