Even Parity $\Theta$-Pentaquark and Stable Strange Nuclear Matter

Abstract

The newly discovered exotic $\Theta$ baryon of mass 1540 MeV (and very small width) truly has a very low mass, if it is a pentaquark system of even parity. A schematic model in which the coherent interaction of $u\bar{s}$ and $d\bar{s}$ pairs leads to a very large residual (non-confining) attractive interaction is introduced. This collective vibrational model accounts for the mass and small decay width to the $KN$ channel, but yields a significant coupling to the virtual $K^{\ast }N$ channel. The schematic model predicts an attractive $\Theta$-nucleon interaction strong enough to bind a $\Theta$ particle to a nucleus in a state that is stable against decay via strong interactions. The discovery of $\Theta$-nuclei could be a definitive proof that the $\Theta$ parity is even.

9 pages, 2 figures Replacment adds references and corrects a typographical error

References in corpus (15)

• Observation of an Exotic S = -2, Q = -2 Baryon Resonance in Proton-Proton Collisions at the CERN SPS
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Cited by in corpus (14)

• Erratum: QCD sum rules study of the $J^{PC}=1^{--}$ charmonium $Y$ mesons
• QCD sum rules study of the $J^{PC}=1^{--}$ charmonium $Y$ mesons
• Generalized mass formula for non-strange and hyper nuclei with SU(6) symmetry breaking
• The effect of the in-medium ${\Theta }^{+}$ pentaquark on the kaon optical potential
• ${\Theta }^{+}$ Hypernuclei
• Pentaquark ${\Theta }^{+}$ in nuclear matter and ${\Theta }^{+}$ hypernuclei
• ${\Theta }^{+}$ hypernuclei in relativistic mean field model
• Strange and Heavy Flavoured Hypernuclei in Chiral Soliton Models
• Strange Exotic States and Compact Stars
• Flavored exotic multibaryons and hypernuclei in topological soliton models
• Phenomenological Analysis of Triply Heavy Pentaquarks with configurations $q\Bar{q}QQQ$ and $qqQQ\Bar{Q}$
• Production of ${\Theta }^{+}$ Hypernuclei with the $(K^{+},{\pi }^{+})$ reaction
• In-medium Properties of ${\Theta }^{+}$ as a K$\pi$N structure in Relativistic Mean Field Theory
• Bound states of ${\Theta }^{+}$ in nuclei