strange tribaryons as nona-quarks
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
Strange Tribaryons as Nona-quarks
Yuu Maezawa (Univ. Tokyo)
Tetsuo Hatsuda (Univ. Tokyo)
Shoichi Sasaki (RIKEN BNL)
hep-ph/0412025
IntroductionIntroduction
Spin and Parity are undetermined.
Strange tribaryon @KEK-PS
T. Suzuki et al. Phys. Lett. B 597 (2004) 263
M. Iwasaki et al. hep-ph/0310018
(i) High density puzzle
NNNK 3310 MeV
TheoryppnK
(ii) Isospin puzzle
-110 MeV
)3140(S
)3115(0SppnK
pnnK
High central
Density 010~
)channel 0(- IpKStrong attraction
Akaishi and Yamazaki PRC65 (`02) 044005Dote, Horiuchi, Akaishi and Yamazaki, PRC70 (`04) 044313Hadronic pictureHadronic picture
state bound )1405( NK
I=0 I=1
Exp.Model
?
Nona-quark pictureNona-quark picture
uuudddddspnnKS :0
Nona-quark picture
0S
Possible other nona-quark states
Classification in color, flavor and spin space
Mass formula based on MIT bag model
flavor 27-plet
irreducible representation in flavor spin space
Classification in color, flavor and spin spaceClassification in color, flavor and spin spaceAll quarks are in lowest orbital angular momentum.
Degrees of freedom of nona-quark system
anti-symmetriccolor-singlet
Possible multiplets for and )3140(S)3115(0S)1,1(),(0 ISS
)1or 0,1(),( ISS
plet-27 -plet*35
0SSS
S
I3
1
Mass formulaMass formula (Bag model)(Bag model)Aerts et al., PRD 17 (1977) 260.
Constant independent of quantum numbers
Adjusted to reproduce )3115(0S
breaking effect)3(FSU
More strange-quarks Larger mass
spin
Color-magnetic int. effect
flavor multipletLarger Larger mass
small
Parameters
MeV 285Sm• strange quark mass octet baryon
• bag radius 34/1
3 RR NN fm 13 R fm 3.19 R
• strong coupling constant 2.0 and 0.1S
strange mass effect+ flavor dependent effect by CM-int.+ spin, isospin effects
)21,1,27(),,( JIF
MeV21
(due to compact 9-quark structure?)
)3115(0S
Masses of strange tribaryonMasses of strange tribaryon
0S
)3115( vs)3140( 0SS
Case 1 state)21,0*,35(
Case 2 state)21,1,27(
isospin partner of S 0S
MeV 00 SS
Case 3 state)23,1,27(
MeV40200 SS
spin splitting of CM-int.
Too large ?
Too small ?
Nona-quark picture vs. hadronic pictureNona-quark picture vs. hadronic picture
0S
(i) High density puzzle
NOT a puzzle in the quark picture
(ii) Isospin puzzleNOT a puzzle in Case 1,2,3
Not seen yet ?
system ppnK
Other light nona-quarks ?Other light nona-quarks ?largeS Small flavor multiplets
are allowed.Color-magnetic int. small.
0.2S 0.1S
Strangeness tribaryon nona-quark description
Classification in flavor-spin space and mass formula
is identified as
Three possible interpretations of are given.
other light nona-quark states?
SummarySummary
0S )2/1,1,27(),,( JIF
Narrow decay width ( < 21 MeV)
Other interactions (Meson cloud, Instanton induced int. …)
S
Future problems
3for )2/3,1,1(
2for )2/1,2/1,8(
1for )2/1,0*,10(
S
S
S
Back up slides
Masses of strange tribaryonMasses of strange tribaryon
ColorMagneticInt.
strange mass effect flavor dependent effect in CM-int.