Determination of the Theta(+) parity from gamma n - K(-)K(+)n

摘要

It is demonstrated that measurements of photon asymmetry in the gamman --> 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(+). (C) 2004 Published by Elsevier B.V. References: 64