Evidence for a Kaon-Bound State K{sup -}pp Produced in K{sup -} Absorption Reactions at Rest

Journal Article · Fri Jun 03 04:00:00 EDT 2005 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.94.212303· OSTI ID:20696333

Agnello, M ^[1]; Beer, G ^[2]; Benussi, L; Bertani, M; Bianco, S; Fabbri, F L; Gianotti, P; Lucherini, V; Pace, E; Pompili, F; Tomassini, S ^[3]; Botta, E; Bressani, T; De Mori, F; Marcello, S ^[4]; Busso, L; Faso, D ^[5]; Calvo, D; Cerello, P; Feliciello, A ^[6]

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1. Dipartimento di Fisica del Politecnico di Torino, I-10129 Torino (Italy)
2. University of Victoria, Victoria (Canada)
3. INFN Laboratori Nazionali di Frascati, I-00044 Frascati (Italy)
4. Dipartimento di Fisica Sperimentale, Universita di Torino, I-10125 Torino (Italy)
5. Dipartimento di Fisica Generale, Universita di Torino, I-10125 Torino (Italy)
6. INFN Sezione di Torino, I-10125 Torino (Italy); and others

We have searched for a deeply bound kaonic state by using the FINUDA spectrometer installed at the e{sup +}e{sup -} collider DA{phi}NE. Almost monochromatic K{sup -}'s produced through the decay of {phi}(1020) mesons are used to observe K{sup -} absorption reactions stopped on very thin nuclear targets. Taking this unique advantage, we have succeeded to detect a kaon-bound state K{sup -}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}{sup +6}(stat){sub -4}{sup +3}(syst) MeV and 67{sub -11}{sup +14}(stat){sub -3}{sup +2}(syst) MeV, respectively.

• OSTI ID: 20696333
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 21 Vol. 94; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ABSORPTION
BINDING ENERGY
BOUND STATE
HYPERNUCLEI
HYPERONS
KAONS MINUS
MASS DISTRIBUTION
PARTICLE DECAY
PHI-1020 MESONS
PROTON-PROTON INTERACTIONS
PROTONS
RESONANCE
SPECTROMETERS
TWO-BODY PROBLEM