Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2005-07-12
Phys.Rev.Lett.95:152001,2005
Physics
High Energy Physics
High Energy Physics - Experiment
Submitted to PRL
Scientific paper
10.1103/PhysRevLett.95.152001
We report the results of a high-statistics, sensitive search for narrow baryon resonances decaying to $\Xi^-\pi^-$, $\Xi^-\pi^+$, $\bar{\Xi}^+\pi^-$, and $\bar{\Xi}^+\pi^+$. The only resonances observed are the well known $\Xi^0(1530)$ and $\bar{\Xi^0}(1530)$. No evidence is found for a state near 1862 MeV, previously reported by NA49\cite{NA49}. At the 95% confidence level, we find the upper limit for the production of a Gaussian enhancement with $\sigma=7.6$ MeV in the $\Xi^-\pi^-$ effective mass spectrum to be 0.3% of the number of observed $\Xi^0(1530)\to\Xi^-\pi^+$. We find similarly restrictive upper limits for an enhancement at 1862 MeV in the $\Xi^-\pi^+$, $\bar{\Xi}^+\pi^-$, and $\bar{\Xi}^+\pi^+$ mass spectra.
Christian D. C.
Felix Julian
Gottschalk E. E.
Hartouni E. P.
Knapp Bruce C.
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