Speaker
Description
The discussion of light pentaquarks, which was once sparked by the good agreement between the theoretical prediction[1] and the first measurement of the $\Theta^+$[2], has become dormant after the subsequent null results of the $\Theta^+$ baryon from worldwide experiments. However, the recent observation of heavy pentaquarks by the LHCb Collaboration[3] has revitalized interest in pentaquark physics. Although the $\Theta^+$ is most unlikely to exist, we believe that a final attempt should be made for a definitive exclusion. In this talk, we will present the idea to search for the $S=+1$ pentaquark in $K^{+}d → K^0pp$ reaction using $K^+$ beam with a momentum of $p_{K+}=0.5$ GeV/c at J-PARC. Our novel detector system, Hyperon Spectrometer, consisting mainly of a time projection chamber and a 1-T superconducting magnet, will be utilized to exclusively measure the decay products of $\Theta^+$, such that $\Theta^+ \rightarrow K^0p$, followed by $K^0\rightarrow \pi^+\pi^-$. The simulation results will be also presented to discuss the feasibility of the experiment.
[1] D. Diakonov, V. Petrov, and M. V. Polyakov, Z. Phys. A 359, 305 (1997).
[2] T. Nakano et al., (LEPS Collaboration), Phys. Rev. Lett. 91, 012002 (2003).
[3] R. Aaij et al. (LHCb Collaboration), Phys. Rev. Lett. 115, 072001 (2015).
| session | J. Strange Nuclear Systems |
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