Speaker
Dr
Hovanes Egiyan
(CLAS Collaboration)
Description
Following the first observations of the possible $S=+1$ pentaquark state $\Theta^{+}(1540)$, there have been many experiments in various laboratories to verify these results and to search for states which could be associated with other members of the pentaquark antidecuplet. The NA49 collaboration reported the observation of narrow $S=-2$ states with masses about $1860$~GeV showing in the $\Xi \pi$ invariant mass spectra.
These states were identified as isospin $3/2$ members of the pentaquark antidecuplet, and were named $\Phi(1862)$. However, other experiments have failed to reproduce these results.
A dedicated experiment has recently been performed at Jefferson Lab using the CLAS detector to search for the $\Phi(1862)$ state in photoproduction on a deuterium target. A large data sample has been collected and analyzed containing approximately two thousand $\pi^{-} \Xi^{-}$ candidates. The preliminary results of the experiment will be presented and discussed.
Author
Dr
Hovanes Egiyan
(CLAS Collaboration)
