| Project/Area Number |
04640296
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
核・宇宙線・素粒子
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
FUJIWARA Yoshikazu Kyoto Uinversity, Dep't of Physics, Instructor, 理学部, 助手 (70199397)
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| Co-Investigator(Kenkyū-buntansha) |
SUZUKI Yasuyuki Niigata Univ., Dep't of Physics Professor, 理学部, 教授 (70018670)
TAMAGAKI Ryozo Dep't of Physics, Professor, 理学部, 教授 (30027338)
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| Project Period (FY) |
1992 – 1994
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| Project Status |
Completed (Fiscal Year 1994)
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| Budget Amount *help |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1994: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1993: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1992: ¥900,000 (Direct Cost: ¥900,000)
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| Keywords | Quark model / YN interaction / Strangeness / RGM / P波バリオン |
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| Research Abstract |
The purpose of this project is to study the hyperon-nucleon interaction in the constituent quark model. We have succeeded in a unified description of the hyperon-nucleon (YN) and nucleon-uncleon (NN) interaction in the RGM formulation of the SU_6 quark model, in which the full Fermi-Breit interaction with explicit flavor symmetry breaking is incorporated with minimum effective meson-exchange potentials induced from the scalar-meson central and pi, K tensor components of the Nijmegen model-F potential. With few strength parameters determined from the deuteron binding energy and NN ^1S_0 phase shift, all the low-energy cross sections of the YN interaction currently available are reasonably reproduced. In the intermediate-energy region with P_<Lab>=400-600MeV/c, we have found that this model yields a couple of new features in the total cross sections of the SIGMA^+p and LAMBDAp scatterings, which are not observed in the standard phenomenological one-boson-exchange potentials like the Nijmegen potentials. Namely, in SIGMA^+p system the big bump due to the very attractive ^1P_1 phase shifts observed in the Nijmegen models do not show up in the quark model. In LAMBDAp total scattering cross sections, our quark model yields a broad peak with the magnitude of about 100 mb, which is due to the very strong LS^< (-) > force predicted in the quark model. These differences are related to the basic characteristics of the quark model and the meson-exchange potentials in the short-range region, and are subject to the experimental test in near future.
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