Lifetime of doubly charmed baryons

Details Lifetime of doubly charmed baryons Lifetime of doubly charmed baryons

2007-03-31

arxiv.org/abs/0704.0016v1

Commun.Theor.Phys.49:993-1000,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

17 pages, 3 figures and 1 table

Scientific paper

10.1088/0253-6102/49/4/38

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.

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