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Evidence for a Kaon-Bound State K − p p Produced in K − Absorption Reactions at Rest

2005; American Physical Society; Volume: 94; Issue: 21 Linguagem: Inglês

10.1103/physrevlett.94.212303

1092-0145

M. Agnello, G. Beer, L. Benussi, M. Bertani, S. Bianco, E. Botta, T. Bressani, L. Busso, D. Calvo, P. Camerini, P. Cerello, B. Dalena, F. De Mori, G. D’Erasmo, D. Di Santo, L. Fabbri, D. Faso, A. Feliciello, A. Filippi, V. Filippini, E. M. Fiore, Hiroyuki Fujioka, P. Gianotti, N. Grion, V. Lucherini, S. Marcello, T. Maruta, N. Mirfakhrai, O. Morra, T. Nagae, Å. Olin, H. Outa, E. Pace, M. Palomba, A. Pantaleo, A. Panzarasa, V. Paticchio, S. Piano, F. Pompili, R. Rui, G. Simonetti, Hyoungmin So, S. Tomassini, A. Toyoda, R. Wheadon, A. Zenoni,

Nuclear physics research studies

We have searched for a deeply bound kaonic state by using the FINUDA spectrometer installed at the e+e− collider DAΦNE. Almost monochromatic K−’s produced through the decay of ϕ(1020) mesons are used to observe K− absorption reactions stopped on very thin nuclear targets. Taking this unique advantage, we have succeeded to detect a kaon-bound state K−pp through its two-body decay into a Λ hyperon and a proton. The binding energy and the decay width are determined from the invariant-mass distribution as 115+6−5(stat)+3−4(syst) MeV and 67+14−11(stat)+2−3(syst) MeV, respectively.Received 4 March 2005DOI:https://doi.org/10.1103/PhysRevLett.94.212303©2005 American Physical Society