The QCD Scale in the Heavy Quark Expansion

Details The QCD Scale in the Heavy Quark Expansion The QCD Scale in the Heavy Quark Expansion

1992-11-18

arxiv.org/abs/hep-ph/9211268v1

Phys.Rev.D49:6236-6239,1994

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages (LaTeX), MIT-CTP#2167

Scientific paper

10.1103/PhysRevD.49.6236

We argue that consistency of the combined heavy quark and chiral effective lagrangian requires the QCD scale which multiplies $1/M$ in the heavy quark expansion to be the chiral symmetry breaking scale, $\Lambda_{CSB}$, rather than the QCD scale, $\Lambda_{QCD}$. This means that either there is large uncertainty in the accuracy with which the heavy quark effective theory can be applied to $c$ quarks or the cutoff scale of the heavy quark chiral effective theory is lower than has been assumed.

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