9 papers
Spectator Effects in Inclusive Decays of Beauty Hadrons
Massimo Di Pierro, Chris T. Sachrajda
We evaluate the matrix elements of the four-quark operators which contribute to the lifetimes of -mesons and the -baryon. We find that the spectator effects are not respons…
Two-loop hybrid renormalization of local dimension-4 heavy-light operators
G. Amoros, M. Neubert
The renormalization of local dimension-4 operators containing a heavy and a light quark field at scales below the heavy-quark mass is discussed, using the formalism of the heavy-qu…
Higher-order estimates of the chromomagnetic moment of a heavy quark
A. G. Grozin, M. Neubert
The leading beta_0^(n-1) alpha_s^n terms in the Wilson coefficient and anomalous dimension of the chromomagnetic operator in the heavy-quark effective Lagrangian are summed to all…
Two-Loop Anomalous Dimension of the Chromo-Magnetic Moment of a Heavy Quark
G. Amorós, M. Beneke, M. Neubert
We find that the anomalous dimension (in the scheme) of the chromo-magnetic operator in the heavy-quark effective theory is γ_{mag} = (C_A…
Renormalization of Velocity-Changing Dimension-Five Operators in the Heavy-Quark Effective Theory
G. Amorós, M. Neubert
We study the renormalization of operators of the type in the heavy-quark effective theory (HQET). We construct the combinations of such operators that a…
Spectator Effects in Inclusive Decays of Beauty Hadrons
M. Neubert, C. T. Sachrajda
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…