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 115-5+6(stat)-4+3(syst)   MeV and 67-11+14(stat)-3+2(syst)   MeV, respectively.

Evidence for a kaon-bound state K- p p produced in K- absorption reactions at rest.

CAMERINI, Paolo;RUI, RINALDO;
2005

Abstract

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 115-5+6(stat)-4+3(syst)   MeV and 67-11+14(stat)-3+2(syst)   MeV, respectively.
http://prl.aps.org/abstract/PRL/v94/i21/e212303
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11368/1691817
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