Automatic generation of quarkonium amplitudes in NRQCD - INSPIRE

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Automatic generation of quarkonium amplitudes in NRQCD

Pierre Artoisenet
(
- Louvain U., CP3
)
,
Fabio Maltoni
(
- Louvain U., CP3
)
,
Tim Stelzer
(
- Illinois U., Urbana
)

Dec, 2007

17 pages

Published in:

JHEP 02 (2008) 102

e-Print:

0712.2770 [hep-ph]

DOI:

10.1088/1126-6708/2008/02/102

Report number:

CP3-07-31

View in:

ADS Abstract Service

reference search58 citations

Citations per year

Abstract: (arXiv)

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.

Note:

17 pages, 7 figures

QCD
Hadronic Colliders
quantum chromodynamics: nonrelativistic
quarkonium: heavy
amplitude analysis
tree approximation
quantum chromodynamics: factorization
photon photon: interaction
J/psi(3100): photoproduction
electron positron: annihilation

References(45)

Figures(0)

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