Determination of the ${\Theta }^{+}$ parity from $\gamma n\to K^{-}{K}^{+}n$

Abstract

It is demonstrated that measurements of photon asymmetry in the $\gamma n\to K^{-}{K}^{+}n$ reaction, can most likely determine the parity of the newly discovered ${\Theta }^{+}$ pentaquark. We predict that if the parity of ${\Theta }^{+}$ is positive, the photon asymmetry is significantly positive; if the parity is negative, the photon asymmetry is significantly negative. If the background contribution is large, the photon asymmetry may become very small in magnitude, thereby making it difficult to distinguish between the positive and negative parity results. However, even in this case, a combined analysis of the $(K^{+}n)$ invariant mass distribution and photon asymmetry should allow a determination of the parity of ${\Theta }^{+}$.

arXiv commentrevised version, revtex file, 14 pages, 4 figures, minor revision

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• Parity of ${\Theta }^{+}$(1540) from QCD sum rules
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• Pentaquark Theta^+(1540) production in gamma N --> K Anti-K N
• Anti-charmed pentaquark ${\Theta }_c(3099)$ from QCD sum rules
• Pentaquark baryons in SU(3) quark model
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• How to measure the parity of the ${\Theta }^{+}$ in $\vec{p}\vec{p}$ collisions
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• Investigating the parity of the exotic Theta^+ baryon from the kaon photoproduction
• Photoproduction of the Theta^+ resonance on the nucleon in a Regge model
• Pentaquark baryon production from photon-neuteron reactions
• Phenomenology of spin 3/2 baryons with pentaquarks
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• Photoproduction of pentaquark cascades from nucleons
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• Broken SU(3) antidecuplet for ${\Theta }^{+}$ and ${\Xi }_{3/2}$
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• Polarization Observables in $\gamma N\to K\bar{K}N$
• Possibility of determinig the parity of the pentaquark ${\Theta }^{+}$ from photoproduction near threshold
• 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
• Angular distribution and azimuthal asymmetry for pentaquark production in proton-proton collisions