We have searched for a deeply bound kaonic state by using the FINUDA spectrometer installed at the e+e- collider DAPhiNE. Almost monochromatic K-'s produced through the decay of phi(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 Lambda hyperon and a proton. The binding energy and the decay width are determined from the invariant-mass distribution as 115<sub>-5</sub><sup>+6</sup>(stat)<sub>-4</sub><sup>+3</sup>(syst) MeV and 67<sub>-11</sub><sup>+14</sup>(stat)<sub>-3</sub><sup>+2</sup>(syst) MeV, respectively.
Evidence for a Kaon-Bound State K-pp Produced in K- Absorption Reactions at Rest
BOTTA, Elena;BRESSANI, Tullio;BUSSO, Luigi;DE MORI, FRANCESCA;FASO, Diego;MARCELLO, Simonetta;
2005-01-01
Abstract
We have searched for a deeply bound kaonic state by using the FINUDA spectrometer installed at the e+e- collider DAPhiNE. Almost monochromatic K-'s produced through the decay of phi(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 Lambda hyperon and a proton. The binding energy and the decay width are determined from the invariant-mass distribution as 115-5+6(stat)-4+3(syst) MeV and 67-11+14(stat)-3+2(syst) MeV, respectively.
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