Two-photon exchange effect studied with neural networks

被引：18

作者：

Graczyk, Krzysztof M. ^{[1
]}

机构：

[1] Univ Wroclaw, Inst Theoret Phys, PL-50204 Wroclaw, Poland

来源：

PHYSICAL REVIEW C | 2011年 / 84卷 / 03期

关键词：

PROTON ELASTIC-SCATTERING; ELECTRON-PROTON;

D O I：

10.1103/PhysRevC.84.034314

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

An approach to the extraction of the two-photon exchange (TPE) correction from elastic ep scattering data is presented. The cross-section, polarization transfer (PT), and charge asymmetry data are considered. It is assumed that the TPE correction to the PT data is negligible. The form factors and TPE correcting term are given by one multidimensional function approximated by the feedforward neural network (NN). To find a model-independent approximation, the Bayesian framework for the NNs is adapted. A large number of different parametrizations is considered. The most optimal model is indicated by the Bayesian algorithm. The obtained fit of the TPE correction behaves linearly in epsilon but it has a nontrivial Q(2) dependence. A strong dependence of the TPE fit on the choice of parametrization is observed.

引用

页数：8

共 13 条

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