Search for doubly charmed hadron at B factory

Understand

The doubly charmed hadron production at B factories is of special importance for the study of the hadron structure and the color connections before hadronization.

• To suppress the combination background fluctuations of the reconstructed hadron mass spectra, we suggest a three-jet event shape trigger.
• After these three jets are identified by their energy and angular distributions, it is found that: 1) The background process $e^+ e^- \to c\bar {c} \to h's$ in consideration of the final hadron system $\Lambda_c^+K^-\pi^+ +X$ are significantly suppressed.
• 2) For the selected events, about half of the particles, $\Lambda_c^+$, $K^-$, $\pi^+$, which obviously can not belong to the decay products of doubly charmed hadron, can be vetoed.