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Report number	arXiv:1702.06735
Title	Amplitude analysis of four-body decays using a massively-parallel fitting framework
Related title	Amplitude analysis of four-body decays using a massively-parallel fitting framework
Author(s)	Hasse, C. (CERN ; Tech. U., Dortmund (main) ; Cincinnati U.) ; Albrecht, J. (Tech. U., Dortmund (main)) ; Alves, A.A. (Cincinnati U.) ; d'Argent, P. (Heidelberg U.) ; Evans, T.D. (Oxford U.) ; Rademacker, J. (Bristol U.) ; Sokoloff, M.D. (Cincinnati U.)
Publication	2017-11-20
Imprint	2017-02-22
Number of pages	7
Note	Proceedings of the 22nd International Conference on Computing in High Energy and Nuclear Physics, CHEP 2016
In:	J. Phys.: Conf. Ser. 898 (2017) 072016
In:	22nd International Conference on Computing in High Energy and Nuclear Physics, CHEP 2016, San Francisco, Usa, 10 - 14 Oct 2016, pp.072016
DOI	10.1088/1742-6596/898/7/072016
Subject category	physics.data-an ; Computing and Computers ; physics.comp-ph ; hep-ex ; Particle Physics - Experiment
Abstract	The GooFit Framework is designed to perform maximum-likelihood fits for arbitrary functions on various parallel back ends, for example a GPU. We present an extension to GooFit which adds the functionality to perform time-dependent amplitude analyses of pseudoscalar mesons decaying into four pseudoscalar final states. Benchmarks of this functionality show a significant performance increase when utilizing a GPU compared to a CPU. Furthermore, this extension is employed to study the sensitivity on the $D^0 - \bar{D}^0$ mixing parameters $x$ and $y$ in a time-dependent amplitude analysis of the decay $D^0 \rightarrow K^+\pi^-\pi^+\pi^-$. Studying a sample of 50 000 events and setting the central values to the world average of $x = (0.49 \pm0.15) \%$ and $y = (0.61 \pm0.08) \%$, the statistical sensitivities of $x$ and $y$ are determined to be $\sigma(x) = 0.019 \%$ and $\sigma(y) = 0.019 \%$.
Copyright/License	CC-BY-4.0

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