Remarks on the parity determination of narrow resonances

Abstract

Recently several proposals were put forward to determine the parity of narrow baryonic resonances, in particular the ${\Theta }^{+}$. In these proceedings we will briefly comment on the general problems in this task and then discuss in detail the potential of reactions of the type $\vec{N}\vec{N}\to {\Theta }^{+}Y$, where $Y$ denotes a hyperon (either $\Sigma$ or $\Lambda$) and the arrows indicate that a polarized initial state is required. Besides reiterating the model--independent properties of this class of reactions we discuss the physics content of some model calculations.

Invited talk presented at PENTAQUARK04 July 20-23, 2004 at SPring-8, Japan

References in corpus (8)

• Evidence for a narrow resonance at 1530 MeV/c2 in the K0 p - system of the reaction pp --> Sigma+ K0 p from the COSY-TOF experiment
• Why the Theta+ is seen in some experiments and not in others - a possible explanation
• On the determination of the parity of the ${\Theta }^{+}$
• Threshold production of the ${\Theta }^{+}$ in a polarized proton reaction
• A possibility to determine the P-parity of the ${\Theta }^{+}$ pentaquark in the $pn\to {\Lambda }^0{\Theta }^{+}$ reaction
• Polarization observables in the processes $p+p\to {\Theta }^{+}+{\Sigma }^{+}$ and $n+p\to {\Theta }^{+}+{\Lambda }^0$, for any spin and parity of the ${\Theta }^{+}$-hyperon in the threshold region
• From pions to pentaquarks
• Production of the pentaquark ${\Theta }^{+}$ in $np$ scattering