1998/10/31 by Filippo Berto, F. Berto, J. L. Domenech +3
Mathematics · Physics and Astronomy · #Antiparticle #Biology #Ecology #Electron #Field (mathematics) #High-Energy Particle Collisions Research #Lagrangian #Mathematical physics #Mathematics #Nuclear physics #Particle (ecology) #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum electrodynamics #Quark #hep-ph
paper · pdf · doi:10.1007/bf03035921
published as Nuovo Cim. A112 (1999) 1181 · LaTeX, 14 pages, 1 EPS figures
arxiv created 1999/07/22 · openalex publication_date 1999/10/01 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.