1. Multi-quark Components in Baryons Bing-song Zou Institute of High Energy Physics, Beijing B.S.Zou and D.O.Riska, “The  ss component of the proton and the strangeness magnetic moment”, hep-ph/0502225 B.C.Liu and B.S.Zou, “Mass and K  coupling of N*(1535)”, nucl-th/0503069

2. 1. Classical picture of the nucleon

3. 2. Flavor asymmetry of light quarks in the nucleon sea Deep Inelastic Scattering (DIS) + Drell-Yan (DY) process  d –  u ~ 0.12 Meson cloud model: | p > ~ | uud > +  | n ( udd )  + (  du ) > + …

4. DIS Gottfried Sum Rule : assuming  d =  u

6. 3. The  ss component of the proton and the strangeness magnetic moment  s neutrino DIS sizable charm production, Meson cloud model: | p > ~ | uud > +  | n ( udd )  + (  du ) > +  ’ |  (uds) K + (  su ) > + …

7. Parity violating electron scattering   s Strong experiment evidence for  s > 0 HAPPEX/CEBAF, SAMPLE/MIT-Bates, A4/MAMI Meson cloud models   s < 0 p   (uds) K + (  su )

8. B.S.Zou and D.O.Riska, “The  ss component of the proton and the strangeness magnetic moment”, hep-ph/0502225 considers general (uuds  s) orbital-flavor-spin configurations For proton, spin-parity is ½ +. One quark or antiquark needs to be in p-state

9. [4] x [31] x All possible (uuds  s) configurations Flavor-spin hyperfine interaction :

10. Wave functions for [4] x and [31] x configurations : J.-Q. Chen, Group Representation Theory for Physicists, World Scientific, Singapore (1989)

11. Calculation of the strangeness magnetic moment  s :  s = Results : (uuds) ground states   s < 0 except for S(4q)=2 (uuds) [31] x states   s > 0 except for J(4q)=0 Diquark  s [ud][us]  pentaquark models   s > 0 Triquark-diquark {  ssu} [ud] model   s < 0

12. Conclusion on  ss configuration : Strong experiment evidence for  s > 0 suggests that the  ss configuration in the proton be such that the  s is in the ground state and the (uuds) system has total angular momentum 1. Not the conventional K  configuration. This suggests that the (qqqq  q) components in baryons may be mainly in colored quark cluster configurations rather than in ``meson cloud'' configurations.

13. 4. New information on N*(1535) BES Collaboration, Phys. Lett. B510 (2001) 75

14. Events/ 10 MeV NxNx NxNx NxNx PS, eff. corrected ( Arbitrary normalization) N*(1535) in J/    p K -  + c.c. BES, Int. J. Mod. Phys. A20 (2005)

15. B.C.Liu and B.S.Zou, nucl-th/0503069 From relative branching ratios of J/    p  N*  p (K-  p (  p  g N*K  /g N*p  /g N*p  ~ 1.3 : 1 : 0.6 Smaller N*(1535) BW mass

16. (1) (2) (3) Mass of N*(1535)

17. N*(1535) ~ uud (L=1) +  [ud][us]  s + … N*(1440) ~ uud (n=2) +  [ud][ud]  d +1/3 [ud][us]  s ) + … Larger [ud][us]  s component in N*(1535) makes it coupling stronger to strangeness and heavier ! A.Zhang, Y. Liu, P. Huang, W. Deng, X.Chen, S.L. Zhu, hep-ph/0403210 : 1/2- and 1/2+ octet N* pentaquarks have similar masses in Jaffe-Wilczek diquark model

18. 5. Concluding remarks Multiquark components in baryons Pentaquark vs Meson Cloud Which is the correct picture ? Re-examination of many previous studied processes is necessary ! P ~ uud (n=2) +  [ud][ud]  d +1/3 [ud][us]  s ) + …    d –  u ~ 0.12 >15% in the nucleon, ?% in N* and  *