Understand
Fortran subroutines to calculate helicity amplitudes with massive spin-2 particles (massive gravitons), which couple to the standard model particles via the energy momentum tensor, are added to the {\tt HELAS} ({\tt HEL}icity {\tt A}mplitude {\tt S}ubroutines) library.
- They are coded in such a way that arbitrary scattering amplitudes with one graviton production and its decays can be generated automatically by {\tt MadGraph} and {\tt MadEvent}, after slight modifications.
- All the codes have been tested carefully by making use of the invariance of the helicity amplitudes under the gauge and general coordinate transformations.
Built on
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Similar
G. F. Giudice, R. Rattazzi and J. D. Wells, Nucl. Phys. B 544
1999
Cited alongside, same era.
T. Han, J. D. Lykken and R. J. Zhang, Phys. Rev. D 59
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Cited alongside, same era.
J. Pumplin, D. R. Stump, J. Huston, H. L. Lai, P. Nadolsky and W. K. Tung, JHEP 0207
2002
Cited alongside, same era.
KEK HELAS/MadGraph/MadEvent Home Page, http://madgraph.kek.jp/KEK/
Cited in the paper.
Then
F. Maltoni and T. Stelzer, JHEP 0302
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J. Alwall et al
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Later among the works it cites.
K. Hagiwara, P. Konar, Q. Li, K. Mawatari and D. Zeppenfeld, JHEP 0804
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Closest in time.
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