A Few Aspects of Heavy Quark Expansion

Details A Few Aspects of Heavy Quark Expansion A Few Aspects of Heavy Quark Expansion

2000-12-25

arxiv.org/abs/hep-ph/0012336v1

J.Phys.G27:1081-1100,2001

Physics

High Energy Physics

High Energy Physics - Phenomenology

21 pages, LaTeX, 7 eps figures. To appear in the Proceedings of the UK Phenomenology Workshop on Heavy Flavour and CP Violatio

Scientific paper

10.1088/0954-3899/27/6/304

Two topics in heavy quark expansion are discussed. The heavy quark potential in perturbation theory is reviewed in connection to the problem of the heavy quark mass. The nontrivial reason behind the failure of the "potential subtracted" mass in higher orders is elucidated. The heavy quark sum rules are the second subject. The physics behind the new exact sum rules is described and a simple quantum mechanical derivation is given. The question of saturation of sum rules is discussed. A comment on the nonstandard possibility which would affect analysis of BR_sl(B) vs. n_c is made.

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