Search for pentaquarks at Belle

Abstract

We search for the strange pentaquark ${\Theta }^{+}$ using kaon interactions in the material of the Belle detector. No signal is observed in the $p{K}_S$ final state, while in the $p{K}^{-}$ final state we observe $\sim 1.6\cdot 10^4$ $\Lambda (1520)\to p{K}^{-}$ decays. We set an upper limit on the ratio of ${\Theta }^{+}$ to $\Lambda (1520)$ yields $\sigma ({\Theta }^{+})/\sigma (\Lambda (1520))<2$ at 90% CL assuming that the ${\Theta }^{+}$ is narrow. We also report on searches for strange and charmed pentaquarks in B meson decays. These results are obtained from a 155$f{b}^{-1}$ data sample collected with the Belle detector near the ${\rm Y}(4S)$ resonance, at the KEKB asymmetric energy $e^{+}{e}^{-}$ collider.

10 pages, 6 figures. To appear in the Proceedings of the PENTA04 conference in Kobe, Japan. These results were also presented by Belle at the ICHEP04 conference in Beijing, China and at the FPCP04 conference in Daegu, Korea. Minor correction

Cited by in corpus (5)

• The Physics of the B Factories
• A comprehensive search for the Θ^+ pentaquark on the lattice
• Absence of evidence for pentaquarks on the lattice
• Charm physics at Belle
• Heavy Pentaquarks in the Diquark Model and the Large N_c Expansion