Direct quark mechanism for weak ΛN → NN processes

✍ Scribed by Makoto Oka

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 560 KB
• Volume: 639
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/s0375-9474(98)00289-9

✦ Synopsis

Two-body weak processes AN +) NN are studied from the viewpoint of quark substructure of baryons.

They can be studied in nonmesonic weak decays of hypernuclei and also hyperon production in NN scattering. The direct quark mechanism, in contrast to the one-pion exchange mechanism, is shown to give sizable AI = 3/2 contribution in the J = 0 channel. Nonmesonic decay rates of :H, iHe, and ;He agree with the current experimental data fairly well. Especially, the n/p ratio is enhanced by the direct quark contribution.

The cross sections for pn + Ap scattering are studied in the quark cluster-mode1 approach.