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We derive a tree-level heavy quark effective Lagrangian keepingparticle-antiparticle mixed sectors allowing for heavy quark-antiquark pairannihilation and creation. However, when removing the unwanted degrees offreedom from the effective Lagrangian one has to be careful in using theclassical equations of motion obeyed by the effective fields in order to get aconvergent expansion on the reciprocal of the heavy quark mass. Then theapplication of the effective theory to such hard processes should be sensiblefor special kinematic regimes as for example heavy quark pair production nearthreshold.Comment: LaTeX, 14 pages, 1 EPS figure

A heavy-quark effective field Lagrangian keeping particle and antiparticle mixed sectors