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Strange Tribaryons as Nona-quarks

Strange Tribaryons as Nona-quarks. Yuu Maezawa (Univ. Tokyo) Tetsuo Hatsuda (Univ. Tokyo) Shoichi Sasaki (RIKEN BNL). hep-ph/0412025. T. Suzuki et al. Phys. Lett. B 597 (2004) 263. Introduction. M. Iwasaki et al. hep-ph/0310018. Strange tribaryon @KEK-PS.

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Strange Tribaryons as Nona-quarks

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  1. Strange Tribaryons as Nona-quarks Yuu Maezawa (Univ. Tokyo) Tetsuo Hatsuda (Univ. Tokyo) Shoichi Sasaki (RIKEN BNL) hep-ph/0412025

  2. T. Suzuki et al. Phys. Lett. B 597 (2004) 263 Introduction M. Iwasaki et al. hep-ph/0310018 Strange tribaryon @KEK-PS Spin and Parity are undetermined.

  3. High central Density Akaishi and Yamazaki PRC65 (`02) 044005 Hadronic picture Dote, Horiuchi, Akaishi and Yamazaki, PRC70 (`04) 044313 Strong attraction (i) High density puzzle 3310 MeV -110 MeV (ii) Isospin puzzle Exp. Model ? I=0 I=1

  4. Nona-quark picture Nona-quarkpicture • Classification in color, flavor and spin space • Mass formula based on MIT bag model flavor 27-plet Possible other nona-quark states

  5. Classification in color, flavor and spin space All quarks are in lowest orbital angular momentum. Degrees of freedom of nona-quark system anti-symmetric color-singlet irreducible representation in flavor spin space

  6. Possible multiplets for and S I3

  7. breaking effect More strange-quarks Largermass Aerts et al., PRD 17 (1977) 260. Mass formula(Bag model) Constant independent of quantum numbers Adjusted to reproduce Color-magnetic int. effect flavor multiplet Larger Largermass spin

  8. small Parameters • strange quark mass octet baryon • bag radius • strong coupling constant

  9. Masses of strange tribaryon strange mass effect + flavor dependent effect by CM-int. + spin, isospin effects (due to compact 9-quark structure?)

  10. isospin partner of Case 1 state Too large ? Case 2 state Too small ? Case 3 state spin splitting of CM-int.

  11. ここにスライド３に対する答えをまとめる Nona-quark picture vs. hadronic picture (i) High density puzzle NOT a puzzle in the quark picture (ii) Isospin puzzle NOT a puzzle in Case 1,2,3 Not seen yet ?

  12. Other light nona-quarks ? Small flavor multiplets are allowed. Color-magnetic int. small.

  13. Summary • Strangeness tribaryonnona-quark description • Classification in flavor-spin space and mass formula • is identified as • Three possible interpretations of are given. • other light nona-quark states? Future problems • Narrow decay width ( < 21 MeV) • Other interactions (Meson cloud, Instanton induced int. …)

  14. Back up slides

  15. Masses of strange tribaryon strange mass effect flavor dependent effect in CM-int. Color Magnetic Int.

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