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RESEARCH PRODUCT
Quark mass dependence of s-wave baryon resonances
M.f.m. LutzJuan Luis NievesCarmen Garcia-reciosubject
QuarkPhysicsParticle physicsNuclear and High Energy PhysicsOctetNuclear TheoryNuclear TheoryHigh Energy Physics::PhenomenologyHyperonFOS: Physical sciencesFísicaQuantum numberBaryonNuclear Theory (nucl-th)High Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)Hadron spectroscopyBound stateSinglet statedescription
We study the quark mass dependence of $J^P = \frac12^-$ s-wave baryon resonances. Parameter free results are obtained in terms of the leading order chiral Lagrangian. In the 'heavy' SU(3) limit with $m_\pi =m_K \simeq $ 500 MeV the resonances turn into bound states forming two octets plus a singlet representations of the SU(3) group. A contrasted result is obtained in the 'light' SU(3) limit with $m_\pi =m_K \simeq $ 140 MeV for which no resonances exist. Using physical quark masses our analysis suggests to assign to the $S=-2$ resonances $\Xi(1690)$ and $\Xi(1620)$ the quantum numbers $J^P=1/2^-$.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2003-05-30 | Physics Letters B |