High Energy Physics Seminar

Recently several experimental groups claimed the evidence of new manifestly exotic baryon resonances the $\Theta$(1540)$ the $\Xi^-$ and $\Xi0$ states and the $\Theta_c$ which all require a minimum of 5 quarks state therefore named pentaquark. These surprising new results triggered different experimental groups to look for these pentaquark in their data and renewed the need to refine our understanding of low energy QCD. However there have been a number of searches that were carried out that did not confirm these claimed pentaquark states. We will discuss the various pieces of the experimental evidence relevant to this pentaquark puzzle.