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

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

doi:10.1103/PhysRevLett.94.212303

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.

Titolo:	Evidence for a kaon-bound state K- p p produced in K- absorption reactions at rest.
Autori:	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 mostra contributor esterni nascondi contributor esterni
Data di pubblicazione:	2005
Rivista:	PHYSICAL REVIEW LETTERS
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.
Handle:	http://hdl.handle.net/11368/1691817
Digital Object Identifier (DOI):	http://dx.doi.org/10.1103/PhysRevLett.94.212303
URL:	http://prl.aps.org/abstract/PRL/v94/i21/e212303
Appare nelle tipologie:	1.1 Articolo in Rivista

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