Lambda_b lifetime puzzle in heavy-quark expansion

Details Lambda_b lifetime puzzle in heavy-quark expansion Lambda_b lifetime puzzle in heavy-quark expansion

2003-03-27

arxiv.org/abs/hep-ph/0303235v3

Phys.Rev.D68:114006,2003

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 2 figures, LaTeX2e

Scientific paper

10.1103/PhysRevD.68.114006

Lifetime differences of heavy hadrons can be consistently computed in heavy-quark expansion. The leading effects appear through spectator interactions at order 1/m_b^3. We compute a well-defined subset of 1/m_b^4 corrections to the lifetime ratio of Lambda_b baryon and B_d meson. We find that these corrections are large and should be taken into account in the systematic analysis of heavy hadron lifetimes. We claim that they could shift the ratio \tau_{\Lambda_b}/\tau_{B_d} by as much as -4.5%, significantly reducing the discrepancy between the theoretical predictions and experimental observations.

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