5-quark states in a chiral potential Atsushi Hosaka (RCNP) Structure of a Pentaquark baryon Q + JPS meeting Miyazaki, Sept 2003
Experiment at LEPS Quantum numbers JPS meeting Miyazaki, Sept 2003 Experiment at LEPS Quantum numbers At least 4 quarks + 1 antiquark => Purely exotic Quark content => Unknoswn quantum numbers
Theta production at LEPS
JPS meeting Miyazaki, Sept 2003 picture
JPS meeting Miyazaki, Sept 2003 Quark model Flavor structure
Masses Parity Sum of constituent quarks udud s Negative JPS meeting Miyazaki, Sept 2003 Masses Parity Sum of constituent quarks p udud s Negative
KN Bound state approach of Skyrmion JPS meeting Miyazaki, Sept 2003 KN Bound state approach of Skyrmion S-wave bound state => Negative parity P-wave bound state => Positive parity P-orbit P s
Chiral soliton Assumptions: • Large-Nc => Skyrme soliton (hedgehog) JPS meeting Miyazaki, Sept 2003 Chiral soliton Diakonov et al (1997) Assumptions: • Large-Nc => Skyrme soliton (hedgehog) • SU(3) collective motion in flavor space Rotation of a hedgehog in SU(3) flavor space
Predictions Spin parity JP = 1/2+ Flavor 10, Isospin I = 0 JPS meeting Miyazaki, Sept 2003 Predictions Flavor 10, Isospin I = 0 Relatively small M(Q+) Wider splitting Spin parity JP = 1/2+ and small width ~ 15 MeV
Chiral popential Chiral bag model Hedgehog Chiral MIT JPS meeting Miyazaki, Sept 2003 Chiral popential Chiral bag model Hosaka Toki, Phys Rep ‘96 Hedgehog MIT Chiral Grand angular momentum
s-t interaction Hedgehog corraltion Spin-isospin splitting JPS meeting Miyazaki, Sept 2003 s-t interaction Hedgehog corraltion Spin-isospin splitting
Chiral bag Positive parity Negative parity JPS meeting Miyazaki, Sept 2003 Chiral bag Negative parity Positive parity
Theory and exp Const. quark model Chiral soliton: Collective quant. Skyrmion bound state Chiral bag Diquark Sum rule Lattice Gamma + n, p, d -> K+ + n, p, d -> pp ->
What more? Spin and parity 2. Internal structure of 5quarks JPS meeting Miyazaki, Sept 2003 What more? Spin and parity 2. Internal structure of 5quarks Diquark correlation Chiral interaction Other bound states of many quarks (2) (1) polarization total cross sections