Lifetimes of doubly charmed baryons: $Ξ_{cc}^{+}$ and $Ξ_{cc}^{++}$

Details Lifetimes of doubly charmed baryons: $Ξ_{cc}^{+}$ and $Ξ_{cc}^{++}$ Lifetimes of doubly charmed baryons: $Ξ_{cc}^{+}$ and $Ξ_{cc}^{++}$

1998-07-13

arxiv.org/abs/hep-ph/9807354v1

Phys.Rev. D60 (1999) 014007

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, Latex file, 3eps figes

Scientific paper

10.1103/PhysRevD.60.014007

We have performed a detailed investigation of total lifetimes for the $\Xi_{cc}^{++}$ and $\Xi_{cc}^{+}$ baryons in the framework of operator product expansion over the inverse mass of charmed quark, whereas, to estimate matrix elements of operators obtained in OPE, some approximations of nonrelativistic QCD are used. This approach allows one to take into account the corrections to the spectator decays of $c$-quarks, which reflect the fact, that these quarks are bound, as well as the contributions, connected to the effects of both the Pauli interference for the $\Xi_{cc}^{++}$-baryon and the weak scattering for the $\Xi_{cc}^{+}$-baryon. The realization of such program leads to the following estimates for the total lifetimes of doubly charmed baryons: $\tau_{\Xi_{cc}^{++}}=0.43\pm 0.1~ps$ and $\tau_{\Xi_{cc}^{+}}=0.11\pm 0.01~ps$.

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