How to measure the parity of the $Θ^+$ in $\vec p\vec p$ collisions

Details How to measure the parity of the $Θ^+$ in $\vec p\vec p$ collisions How to measure the parity of the $Θ^+$ in $\vec p\vec p$ collisions

2003-12-17

arxiv.org/abs/hep-ph/0312236v2

Phys.Lett. B590 (2004) 39-44

Physics

High Energy Physics

High Energy Physics - Phenomenology

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

Scientific paper

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.

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