Fast calculation of HELAS amplitudes using graphics processing unit (GPU) |
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Authors: | K Hagiwara J Kanzaki N Okamura D Rainwater T Stelzer |
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Institution: | 1. KEK Theory Center and Sokendai, Tsukuba, 305-0801, Japan 2. KEK, Tsukuba, 305-0801, Japan 3. Space and Geophysics Laboratory, Applied Research Laboratories, University of Texas, Austin, TX, 78758, USA 4. Department of Physics, University of Illinois, Urbana, IL, USA
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Abstract: | We use the graphics processing unit (GPU) for fast calculations of helicity amplitudes of physics processes. As our first attempt, we compute $u\overline{u}\rightarrow n\gamma$ (n=2 to 8) processes in pp collisions at $\sqrt{s}=14$ 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 a 40–150 times better performance on the GPU. |
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