An Analysis of Quark Effect in Two Baryon System

ZHANG Zong-Ye; YU You-Wen

Chinese Physics C> 2002, Vol. 26> Issue(7) : 712-720

An Analysis of Quark Effect in Two Baryon System

ZHANG Zong-Ye ^, ,
YU You-Wen

Institute of High Energy Physics, CAS, Beijing 100039, China

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Abstract：
The quark effect in the two baryon systems is studied by making an analysis of the quark exchange terms. The results point out that the quark effect becomes visible only when the two baryon clusters are close to each other. So its influence is much more important in the S waves than in P waves, and the expectation value of the permutation operator in the spin-flavor-color space plays significant role. For some spin-flavor states, the Pauli Blocking Effect is very serious, there should be a big repulsive core radius between these two baryons. But for some other spin-flavor states, the quark exchange effect is favorable for mixing the two baryon clusters together to form dibaryon. Therefore the data of the phase shifts of the baryon-baryon scattering and the binding energies of the two baryon systems are cardinal in examining the quark effect.

References

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. Wheeler J A. Phys. Rev.,1973,52:1083,1107 2. Wildermuth K, TANG Y C. A Unified Therory of the Nucleus(Vieweg, Braunschweig,1977)3. ZHANG Zong-Ye, YU You-Wen, DAI Lian-Rong. HEPNP, 1996,20(4):363—368(in Chinese)(张宗烨,余友文,戴连荣.高能物理与核物理,1996,20(4):363)4. ZHANG Zong-Ye, YU You-Wen, SHEN Peng-Nian et al. Nucl. Phys.,1997,A625:595. YU You-Wen, ZHANG Zong-Ye, YUAN X Q. Commun. Theor. Phys.,1999,31:1;ZHANG Zong-Ye, YU You-Wen, CHING C R et al. Phys. Rev.,2000,C61:065204 6. LI Q B, SHEN P N, ZHANG Z Y, et al. Nucl. Phys.,2001,A683:487 7. YUAN X Q, ZHANG Z Y, YU Y W, et al. Phys. Rev.,1999,C60:045203 8. ZHANG Zong-Ye, LI Guang-Lie, SHEN Jian-Ping. Transactions of the New York Academy of Sciences SeriesⅡ,1980,40:274—286

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ZHANG Zong-Ye and YU You-Wen. An Analysis of Quark Effect in Two Baryon System[J]. Chinese Physics C, 2002, 26(7): 712-720.

ZHANG Zong-Ye and YU You-Wen. An Analysis of Quark Effect in Two Baryon System[J]. Chinese Physics C, 2002, 26(7): 712-720. shu

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Received: 2001-11-27
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

An Analysis of Quark Effect in Two Baryon System

ZHANG Zong-Ye ^,
YU You-Wen

Corresponding author: ZHANG Zong-Ye,

Institute of High Energy Physics, CAS, Beijing 100039, China

Received Date: 2001-11-27
Accepted Date: 1900-01-01
Available Online: 2002-07-05

Abstract: The quark effect in the two baryon systems is studied by making an analysis of the quark exchange terms. The results point out that the quark effect becomes visible only when the two baryon clusters are close to each other. So its influence is much more important in the S waves than in P waves, and the expectation value of the permutation operator in the spin-flavor-color space plays significant role. For some spin-flavor states, the Pauli Blocking Effect is very serious, there should be a big repulsive core radius between these two baryons. But for some other spin-flavor states, the quark exchange effect is favorable for mixing the two baryon clusters together to form dibaryon. Therefore the data of the phase shifts of the baryon-baryon scattering and the binding energies of the two baryon systems are cardinal in examining the quark effect.