Automatic generation of quarkonium amplitudes in NRQCD

Details Automatic generation of quarkonium amplitudes in NRQCD Automatic generation of quarkonium amplitudes in NRQCD

2007-12-17

arxiv.org/abs/0712.2770v1

JHEP 0802:102,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

17 pages, 7 figures

Scientific paper

10.1088/1126-6708/2008/02/102

We present a simple method to automatically evaluate arbitrary tree-level amplitudes involving the production or decay of a heavy quark pair QQbar in a generic {2S+1}L_J^[1,8] state, i.e., the short distance coefficients appearing in the NRQCD factorization formalism. Our approach is based on extracting the relevant contributions from the open heavy quark-antiquark amplitudes through an expansion with respect to the quark-antiquark relative momentum and the application of suitable color and spin projectors. To illustrate the capabilities of the method and its implementation in MadGraph a few applications to quarkonium collider phenomenology are presented.

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