The 18th International Symposium on Spin Physics

October 6-11, 2008
University of Virginia
Charlottesville, VA USA

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First Name Heli
Last Name Honkanen
Affiliation Iowa State University
Title New avenue to the Parton Distribution Functions: Self-Organizing Map
Topic Oral
Abstract of 200 words or less
Neural nerwork algorithms have been recently applied to construct Parton Distribution Function (PDF) parametrizations which provide an alternative to standard global fitting procedures. We propose a technique based on an interactive neural network algorithm using Self-Organizing Maps (SOMs). SOMs are a class of clustering algorithms based on competitive learning among spatially-ordered neurons. Our SOMs are trained on selections of stochastically generated PDF samples. The selection criterion for every optimization iteration is based on the features of the clusters Our main goal is to provide a fitting procedure that, at variance with the standard neural network approaches, allows for an increased control of the systematic bias by enabling user interaction in the various stages of the process.