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 / M., Agnello; G., Beer; L., Benussi; M., Bertani; S., Bianco; E., Botta; T., Bressani; L., Busso; D., Calvo; Camerini, Paolo; P., Cerello; B., Dalena; F., DE MORI; G., D'Erasmo; D., DI SANTO; F. L., Fabbri; D., Faso; A., Feliciello; A., Filippi; V., Filippini; E. M., Fiore; H., Fujioka; P., Gianotti; N., Grion; V., Lucherini; S., Marcello; T., Maruta; N., Mirfakhrai; O., Morra; T., Nagae; A., Olin; H., Outa; E., Pace; M., Palomba; A., Pantaleo; A., Panzarasa; V., Paticchio; S., Piano; F., Pompili; Rui, Rinaldo; G., Simonetti; H., So; S., Tomassini; A., Toyoda; R., Wheadon; A., Zenoni. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 94:(2005), pp. 212303-1-212303-4. [10.1103/PhysRevLett.94.212303]
Evidence for a kaon-bound state K- p p produced in K- absorption reactions at rest.
CAMERINI, Paolo;RUI, RINALDO;
2005-01-01
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.Pubblicazioni consigliate
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