Search for double-Lambda hypernuclei and the H-dibaryon in the (K-, K+) reaction on C-12

Citation
K. Yamamoto et al., Search for double-Lambda hypernuclei and the H-dibaryon in the (K-, K+) reaction on C-12, PHYS LETT B, 478(4), 2000, pp. 401-407
Citations number
29
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICS LETTERS B
ISSN journal
0370-2693 → ACNP
Volume
478
Issue
4
Year of publication
2000
Pages
401 - 407
Database
ISI
SICI code
0370-2693(20000413)478:4<401:SFDHAT>2.0.ZU;2-9
Abstract
A search for double-Lambda hypernuclei (Be-12(Lambda Lambda)) and H-dibaryo ns using the C-12(K-,K+) reaction was perlormeu at the BNL-AGS using a high -intensity 1.8 GeV/c K- beam. A missing-mass analysis below the end point o f the quasi-free Xi(-) was used to investigate these S = -2 systems, The up per limit obtained for the forward-angle cross section of (12)(Lambda Lambd a) Be production is 6 to 10 nb/sr. This is the first search for the direct production of double-Lambda hypernuclei to reach the sensitivity required t o observe the signal predicted by theoretical calculations. For the H-produ ction cross section, we have obtained an upper limit in the range of a few nb/sr to 10 nb/sr for the H mass below 2100 MeV/c(2.) This upper limit is t he most sensitive H search result to date for a tightly bound H. (C) 2000 P ublished by Elsevier Science B.V. All rights reserved.