![]() Such calculations are important for obtaining higher order relativistic corrections to the NRQCD cross-sections and decay rates where the covariant projector approach is not always applicable. We show that despite of being a high energy physics tool, Feyn Calc is also well suitable for situations, where in the matching the manifest Lorentz covariance of QCD must be broken, such that one has to explicitly distinguish between temporal and spatial components of Lorentz tensors. This talk provides examples for using Feyn Calc in heavy quarkonium physics, focussing on matching calculations between QCD and non-relativistic QCD (NRQCD), a well established effective field theory of QCD that is used to describe production and decay of heavy quarkonia. ![]() We present the new version 9 of the Mathematica package Feyn Calc, a useful tool for symbolic evaluation of Feynman diagrams and algebraic calculations in QFT. 10, 10407 Berlin (Germany) Orellana, Frederik [Technical University of Denmark, Anker Engelundsvej 1, Building 101A, 2800 Kgs. 1, 85747 Garching (Germany) Mertig, Rolf [GluonVision GmbH, Boetzowstr. ![]() Shtabovenko, Vladyslav [Technische Universitaet Muenchen, Physik-Department T30f, James-Franck-Str. Energy Technology Data Exchange (ETDEWEB)
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |