1. Evidence for a Kaon-Bound StateK−ppProduced inK−Absorption Reactions at Rest
- Author
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F. De Mori, M. Palomba, H. So, E. Pace, M. Bertani, B. Dalena, N. Mirfakhrai, A. Pantaleo, O. Morra, G. A. Beer, D. Di Santo, G. Simonetti, A. Filippi, V. Filippini, Stefano Bianco, V. Paticchio, M. Agnello, A. Zenoni, R. Rui, T. Maruta, P. Cerello, A. Feliciello, A. Olin, V. Lucherini, E. M. Fiore, N. Grion, Tomofumi Nagae, D. Faso, D. Calvo, P. Gianotti, Akihiro Toyoda, L. Busso, P. Camerini, S. Piano, F.L. Fabbri, R. Wheadon, Hiroyuki Fujioka, S. Marcello, E. Botta, F. Pompili, G. D’Erasmo, Haruhiko Outa, L. Benussi, Sandro Tomassini, A. Panzarasa, and T. Bressani
- Subjects
Physics ,Proton ,Meson ,Nuclear Theory ,Binding energy ,Hyperon ,General Physics and Astronomy ,Resonance ,Nuclear physics ,Particle decay ,Bound state ,High Energy Physics::Experiment ,Absorption (logic) ,Atomic physics ,Nuclear Experiment - Abstract
We have searched for a deeply bound kaonic state by using the FINUDA spectrometer installed at the e{sup +}e{sup -} collider DA{phi}NE. Almost monochromatic K{sup -}'s produced through the decay of {phi}(1020) mesons are used to observe K{sup -} absorption reactions stopped on very thin nuclear targets. Taking this unique advantage, we have succeeded to detect a kaon-bound state K{sup -}pp through its two-body decay into a {lambda} hyperon and a proton. The binding energy and the decay width are determined from the invariant-mass distribution as 115{sub -5}{sup +6}(stat){sub -4}{sup +3}(syst) MeV and 67{sub -11}{sup +14}(stat){sub -3}{sup +2}(syst) MeV, respectively.
- Published
- 2005
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