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Fast calculation of HELAS amplitudes using graphics processing unit (GPU)

K. Hagiwara, J. Kanzaki, N. Okamura, D. Rainwater, T. Stelzer
KEK Theory Center and Sokendai, Tsukuba 305-0801, Japan
Eur. Phys. J. C (2010) 66: 477492

@article{hagiwara2010fast,

   title={Fast calculation of HELAS amplitudes using graphics processing unit (GPU)},

   author={Hagiwara, K. and Kanzaki, J. and Okamura, N. and Rainwater, D. and Stelzer, T.},

   journal={The European Physical Journal C-Particles and Fields},

   volume={66},

   number={3},

   pages={477–492},

   year={2010},

   publisher={Springer}

}

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We use the graphics processing unit (GPU) for fast calculations of helicity amplitudes of physics processes. As our first attempt, we compute $ubaruto nγ$ ($n=2$ to 8) processes in $pp$ collisions at $sqrts = 14$TeV by transferring the MadGraph generated HELAS amplitudes (FORTRAN) into newly developed HEGET ( HELAS Evaluation with GPU Enhanced Technology) codes written in CUDA, a C-platform developed by NVIDIA for general purpose computing on the GPU. Compared with the usual CPU programs, we obtain 40-150 times better performance on the GPU.
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