Search for the Phi(1860) Pentaquark at COMPASS
E.S. Ageev, et al
TL;DR
The COMPASS experiment searched for the exotic Phi(1860) pentaquark in Xi-pi and Xi-bar-pi channels but found no evidence of its existence, despite clear signals of known hyperons.
Contribution
This study provides the first dedicated search for the Phi(1860) pentaquark in high-energy photon interactions at CERN.
Findings
No evidence of Phi(1860) pentaquark observed
Clear signals of Xi(1530)^0 and Xi-bar(1530)^0 hyperons detected
Results constrain the existence of the pentaquark in the studied energy range
Abstract
Narrow Xi-pi+- and Xi-bar+pi+- resonances produced by quasi-real photons have been searched for by the COMPASS experiment at CERN. The study was stimulated by the recent observation of an exotic baryonic state decaying into Xi-pi-, at a mass of 1862 MeV, interpreted as a pentaquark. While the ordinary hyperon states Xi(1530)^0 and Xi-bar(1530)^0 are clearly seen, no exotic baryon is observed in the data taken in 2002 and 2003.
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