Data di Pubblicazione:
2006
Abstract:
A research has been made to look for a signature of the positive-strangeness baryon resonance Θ+(1530),
which is expected to decay into pK0. A peak is observed in the pπ+π− invariant mass distribution in
antiproton– 4He annihilation reactions at rest with production of two π+π− pairs with invariant mass close
to the K0S mass. The annihilation reactions on 4He can involve two to four nucleons producing an energy
blob characterized by high strangeness content. The peak is centred around 1560.0±3.7MeV and its width
is very narrow. The statistical significance is 2.7; this value is considered of not sufficient significance to
claim support of the Θ+. The data were collected with the Obelix spectrometer at the LEAR machine of
CERN.
Tipologia CRIS:
1.1 Articolo in rivista
Keywords:
Antiproton annihilation; Pentaquark; Strangeness; Light nuclei
Elenco autori:
Panzarasa, A.; Bendiscioli, Giorgio; Fontana, Andrea; Lavezzi, Lia; Montagna, PAOLO MARIA; Rotondi, Alberto; Salvini, P.; Botta, E.; Bressani, T.; Costa, S.; Calvo, D.; Feliciello, A.; Filippi, A.; Marcello, S.; Agnello, M.; Iazzi, F.; Minetti, B.; LODI RIZZINI, E.; Corradini, M.; Venturelli, L.; Zenoni, A.; Donzella, A.; Balestra, F.; Bussa, M. P.; Busso, L.; Cerello, P.; Denisov, O.; Ferrero, L.; Garfagnini, R.; Grasso, A.; Maggiora, A.; Tosello, F.; Panzieri, D.; Gorchakov, O. E.; Prakhov, S. N.; Rozhdestvensky, A. M.; Sapozhnikov, G. M.; Tretyak, V. I.; Cicalò, C.; DE FALCO, A.; Masoni, A.; Puddu, G.; Serci, S.; Usai, G.; Curceanu, C.; Gianotti, P.; Guaraldo, C.; Lanaro, A.; Lucherini, V.
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