Amplitude analysis of four-body decays using a massively-parallel fitting framework

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 pseudosc...

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Bibliographic Details
Published in:Journal of physics. Conference series 2017-10, Vol.898 (7), p.72016, Article 072016
Main Authors: Hasse, C, Albrecht, J, Alves, A A, d'Argent, P, Evans, T D, Rademacker, J, Sokoloff, M D
Format: Article
Language:English
Subjects:
Amplitudes
Decay
Mesons
Physics
Sensitivity
Time dependence
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Summary: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 D0−D¯0 mixing parameters x and y in a time-dependent amplitude analysis of the decay D0 → K+π−π+π−. Studying a sample of 50 000 events and setting the central values to the world average of x = (0.49 ± 0.15)% and y = (0.61 ± 0.08)%, the statistical sensitivities of x and y are determined to be σ(x) = 0.019 % and σ(y) = 0.019 %.
ISSN:1742-6588
1742-6596
1742-6596
DOI:10.1088/1742-6596/898/7/072016