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Spectator effects and lifetimes of heavy hadrons

Fabrizio Gabbiani·Andrei I. Onishchenko·Alexey A. Petrov
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Abstract

We present a calculation of subleading 1/m_b corrections to spectator effects in the ratios of beauty hadron lifetimes in heavy-quark expansion. We find that these effects are sizable and should be taken into account in systematic analyses of heavy hadron lifetimes. In particular, the inclusion of 1/m_b corrections brings into agreement the theoretical predictions and experimental observations of the ratio of lifetimes of Λ_b-baryon and B_d meson. We obtain τ(B_u)/τ(B_d) = 1.06 \pm 0.02, τ(B_s)/τ(B_d)= 1.00 \pm 0.01, τ(Λ_b)/τ(B_d)= 0.86 \pm 0.05.

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Fabrizio Gabbiani, Andrei I. Onishchenko, Alexey A. Petrov. 2004-10-21. Spectator effects and lifetimes of heavy hadrons. https://doi.org/10.1103/physrevd.70.094031

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