A novel interpretation of the "$Θ^{+}(1540)$ pentaquark" peak

Details A novel interpretation of the "$Θ^{+}(1540)$ pentaquark" peak A novel interpretation of the "$Θ^{+}(1540)$ pentaquark" peak

2010-08-30

arxiv.org/abs/1008.4978v1

Phys.Rev.Lett.105:092001,2010

Physics

Nuclear Physics

Nuclear Theory

Published in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.105.092001

We use a theoretical model of the $\gamma ~d \to ~K^+ K^- ~n ~p $ reaction adapted to the experiment done at LEPS where a peak was observed and associated to the $\Theta^{+}(1540)$ pentaquark. The study shows that the method used in the experiment to associate momenta to the undetected proton and neutron, together with the chosen cuts, necessarily creates an artificial broad peak in the assumed $K^+ n$ invariant mass in the region of the claimed $\Theta^{+}(1540)$, such that the remaining strength seen for the experimental peak is compatible with a fluctuation of 2$\sigma$ significance.

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