Spectator effects in inclusive decays of beauty hadrons
Mar, 199628 pages
Published in:
- Nucl.Phys.B 483 (1997) 339-370
e-Print:
- hep-ph/9603202 [hep-ph]
Report number:
- CERN-TH-96-19,
- SHEP-96-03
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Abstract:
We present a model-independent study of spectator effects, which are responsible for the lifetime differences between beauty hadrons. These effects can be parametrized in terms of hadronic matrix elements of four four-quark operators. For mesons, the coefficients of the non-factorizable operators turn out to be a factor 10--100 larger than those of the factorizable ones, and so the vacuum insertion approximation cannot be trusted. Theoretically, the deviation of from unity could be as large as 20\%, and even the sign of this deviation cannot be predicted at present. In the case of the baryon, heavy-quark symmetry is used to reduce the number of independent matrix elements from four to two. In order to explain the large deviation from unity in the experimental result for , it is necessary that these baryon matrix elements be much larger than those estimated in quark models. We also study spectator effects in the semi-leptonic branching ratio of mesons and find that they could conceivably lower by up to 1\%.- bottom meson: lifetime
- bottom baryon: lifetime
- lifetime: ratio
- B
- B/s
- B-
- Lambda/b0
- decay: inclusive reaction
- inclusive reaction: decay
- effective Lagrangian
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