# Lifetime of doubly charmed baryons

## TL;DR

This paper calculates the lifetimes of doubly charmed baryons considering non-spectator effects and compares results with existing models, highlighting a significant discrepancy with recent experimental data.

## Contribution

It provides a detailed lifetime calculation including non-spectator effects and compares results with other models, addressing the discrepancy with recent measurements.

## Key findings

- Theoretical lifetimes are an order larger than SELEX measurements.
- Results are consistent with diquark model predictions.
- Discrepancy suggests possible unknown mechanisms or need for further experimental verification.

## Abstract

In this work, we evaluate the lifetimes of the doubly charmed baryons $\Xi_{cc}^{+}$, $\Xi_{cc}^{++}$ and $\Omega_{cc}^{+}$. We carefully calculate the non-spectator contributions at the quark level where the Cabibbo-suppressed diagrams are also included. The hadronic matrix elements are evaluated in the simple non-relativistic harmonic oscillator model. Our numerical results are generally consistent with that obtained by other authors who used the diquark model. However, all the theoretical predictions on the lifetimes are one order larger than the upper limit set by the recent SELEX measurement. This discrepancy would be clarified by the future experiment, if more accurate experiment still confirms the value of the SELEX collaboration, there must be some unknown mechanism to be explored.