Search for a narrow baryonic state decaying to $p{K}_0^S$ and $\bar{p}{K}_0^S$ in deep inelastic scattering with the HERA II data

Abstract

This paper presents the result of a search for a narrow strange baryonic state in the invariant-mass distribution of $p{K}_S^0(\overline{p}{K}_S^0)$ in HERA II data (2003-2007). The search was performed in the deep inelastic scattering (DIS) data with photon virtuality, $Q^2$, between 20 and 100 GeV. The analysis in HERA II period has improvements over the previous ZEUS analysis in HERA I period (1996-2000). These consist of large statistics and improved particle identification performance by using both of the CTD $dE/dx$ and the MVD $dE/dx$ in this search. Contrary to evidence for such an exotic state around 1.52 GeV in the HERA I data, no such state is found in this analysis. The upper limits on the production cross section are set at 95% confidence level.

Comments: 6 pages, 5 figures, the proceedings of the XXIV International Workshop on Deep-Inelastic Scattering and Related Subjects, 11-15 April 2016, DESY Hamburg, Germany