Obtaining Parton Distribution Functions from Self-Organizing Maps

Details Obtaining Parton Distribution Functions from Self-Organizing Maps Obtaining Parton Distribution Functions from Self-Organizing Maps

2006-08-22

arxiv.org/abs/hep-ph/0608254v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 1 figure, Talk delivered by S. Liuti at "XIV Deep Inelastic Scattering Workshop", Tsukuba, Japan, April 20-24, 2006

Scientific paper

We present an alternative algorithm to global fitting procedures to construct Parton Distribution Functions (PDFs) parametrizations. The proposed algorithm uses Self-Organizing Maps (SOMs) which at variance with the standard Neural Networks, are based on competitive-learning. SOMs generate a non-uniform projection from a high dimensional data s pace onto a low dimensional one (usually 1 or 2 dimensions) by clustering similar PDF representations together. The SOMs are trained on progressively narrower selections of data samples. The selection criterion is that of convergence towards a neighborhood of the experimental data. All available data sets on deep inelastic scattering in the kinematical region of 0.001 < x < 0.75, and 1 10 GeV^2 were implemented. The proposed fitting procedure, at variance with standard neural network approaches, allows for an increased control of the systematic bias by enabling the user to directly control the data selection procedure at various stages of the process.

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