Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-12-17
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.
Büscher M.
Eyrich W.
Hanhart Ch.
Kilian K.
Meißner Ulf-G.
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