Some aspects of $Θ^+$ parity determination in the reaction $γ N\to Θ^+ \bar{K}\to N K \bar{K}$

Details Some aspects of $Θ^+$ parity determination in the reaction $γ N\to Θ^+ \bar{K}\to N K \bar{K}$ Some aspects of $Θ^+$ parity determination in the reaction $γ N\to Θ^+ \bar{K}\to N K \bar{K}$

2004-10-25

arxiv.org/abs/nucl-th/0410098v2

Phys.Rev. C71 (2005) 035203

Physics

Nuclear Physics

Nuclear Theory

39 pages, 25 figures

Scientific paper

10.1103/PhysRevC.71.035203

We analyze the problem of how to determine the parity of the $\Theta^+$ pentaquark in the reaction $\gamma N\to K\Theta\to NK\bar{K}$, where $N=n,p$. Our model calculations indicate that the contribution of the non-resonant background of the reaction $\gamma N\to NK\bar{K}$ cannot be neglected, and that suggestions to determine the parity based solely on the initial-stage process $\gamma N\to K\Theta$ cannot be implemented cleanly. We discuss the various mechanisms that contribute to the background, and we identify some spin observables which are sensitive.

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