A heavy quark effective field lagrangian keeping particle and antiparticle mixed sectors

Details A heavy quark effective field lagrangian keeping particle and antiparticle mixed sectors A heavy quark effective field lagrangian keeping particle and antiparticle mixed sectors

1998-10-30

arxiv.org/abs/hep-ph/9810549v4

Nuovo Cim. A112 (1999) 1181

Physics

High Energy Physics

High Energy Physics - Phenomenology

LaTeX, 14 pages, 1 EPS figures

Scientific paper

10.1007/BF03035921

We derive a tree-level heavy quark effective Lagrangian keeping particle-antiparticle mixed sectors allowing for heavy quark-antiquark pair annihilation and creation. However, when removing the unwanted degrees of freedom from the effective Lagrangian one has to be careful in using the classical equations of motion obeyed by the effective fields in order to get a convergent expansion on the reciprocal of the heavy quark mass. Then the application of the effective theory to such hard processes should be sensible for special kinematic regimes as for example heavy quark pair production near threshold.

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