How to measure the parity of the ${\Theta }^{+}$ in $\vec{p}\vec{p}$ collisions

Abstract

Triggered by a recent paper by Thomas, Hicks and Hosaka, we investigate which observables can be used to determine the parity of the ${\Theta }^{+}$ from the reaction $\vec{p}\vec{p}\to {\Sigma }^{+}{\Theta }^{+}$ near its production threshold. In particular, we show that the sign of the spin correlation coefficient $A_{xx}$ for small excess energies yields the negative of the parity of the ${\Theta }^{+}$. The argument relies solely on the Pauli principle and parity conservation and is therefore model--independent.

References completed, discussion on possible influence of background added; conclusions unchanged

References in corpus (5)

• Observation of an Exotic Baryon with S=+1 in Photoproduction from the Proton
• Meson production in nucleon--nucleon collisions close to the threshold
• A Method to Unambiguously Determine the Parity of the Theta+ Pentaquark
• Determination of the ${\Theta }^{+}$ parity from $\gamma n\to K^{-}{K}^{+}n$
• Threshold production of the ${\Theta }^{+}$ in a polarized proton reaction

Cited by in corpus (24)

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• Exotic states of matter in heavy meson decays
• Heavy Pentaquarks
• Spin observables and the determination of the parity of ${\Theta }^{+}$ in photoproduction reactions
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• Even Parity $\Theta$-Pentaquark and Stable Strange Nuclear Matter
• Phenomenology of spin 3/2 baryons with pentaquarks
• Threshold production of the ${\Theta }^{+}$ in a polarized proton 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
• Are the anti-charmed and bottomed pentaquarks molecular heptaquarks?
• Study of a possible S=+1 dynamically generated baryonic resonance
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• Possibility of determinig the parity of the pentaquark ${\Theta }^{+}$ from photoproduction near threshold
• Structure and reactions of pentaquark baryons
• Strangeness Production in pp and pn Reactions at COSY
• Determination of the parity of the pentaquark baryons : Theta^+ and Xi_5
• Antikaon angular distributions in the reaction $\gamma d\to K^{-}{\Theta }^{+}p\to K^{-}{K}^{+}np$ near the threshold and the parity of the ${\Theta }^{+}$ pentaquark
• $P$-parity of charm and strange particles in electroproduction processes, in collinear regime
• Challenges in Hadron Physics
• Spin correlations in the reaction "pi \vec D --> \vecΣΘ^+" and the parity of Theta^+
• Angular distribution and azimuthal asymmetry for pentaquark production in proton-proton collisions