Spin observables and the determination of the parity of ${\Theta }^{+}$ in photoproduction reactions

Abstract

Spin observables in the photoproduction of the ${\Theta }^{+}$ are explored for the purpose of determining the parity of the ${\Theta }^{+}$. Based on reflection symmetry in the scattering plane, we show that certain spin observables in the photoproduction of the ${\Theta }^{+}$ can be related directly to its parity. We also show that measurements of both the target nucleon asymmetry and the polarization may be useful in determining the parity of ${\Theta }^{+}$ in a model-independent way. Furthermore, we show that no combination of spin observables involving only the polarization of the photon and/or nucleon in the initial state can determine the parity of ${\Theta }^{+}$ unambiguously.

LaTeX, 11 pages, minor revision

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Cited by in corpus (16)

• Parity of ${\Theta }^{+}$(1540) from QCD sum rules
• Pentaquark Theta^+(1540) production in gamma N --> K Anti-K N
• Pentaquark baryons in SU(3) quark model
• Neutral pion photoproduction at high energies
• On the determination of the parity of the ${\Theta }^{+}$
• Photoproduction of the Theta^+ resonance on the nucleon in a Regge model
• Phenomenology of spin 3/2 baryons with pentaquarks
• Model-independent determination of the parity of $\Xi$ hyperons
• Spin structure of spin-1/2 baryon and spinless meson production amplitudes in photo and hadronic reactions
• Some aspects of ${\Theta }^{+}$ parity determination in the reaction $\gamma N\to {\Theta }^{+}\bar{K}\to NK\bar{K}$
• Model-independent methods to measure the $P$-parity of the ${\Theta }^{+}$-pentaquark in photoproduction experiments
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• 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