An alternative explanation for the $Θ(1540)$ pentaquark peak

Details An alternative explanation for the $Θ(1540)$ pentaquark peak An alternative explanation for the $Θ(1540)$ pentaquark peak

2010-12-14

arxiv.org/abs/1012.2967v1

Physics

Nuclear Physics

Nuclear Theory

Proceeding for the CHIRAL 10 workshop, Valencia (Spain), June 21-24 2010

Scientific paper

We have studied the $\gamma d \to K^+ K^- n p$ reaction in which the LEPS collaboration found a signal in the $K^+ n$ invariant mass for the claimed $\Theta(1540)$ pentaquark peak. Our study reveal that the procedure used at LEPS to reconstruct the $K^+n$ invariant mass generates an artificial strength in the $\Theta(1540)$ region and that the LEPS collaboration underestimated the background in that region, such that the signal observed for the $\Theta(1540)$ is compatible with a fluctuation of $2\sigma$ over the calculated background.

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