Research on elementary particle physics: Task P, Studies in theory and phenomenology of elementary particles Page: 3 of 7
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we must find methods of labelling quark and gluon jets which do not rely overly
much on details from the theory. Nevertheless, both simulation packages have
similar differences between quark and gluon jets; we believe that the "theoretical
uncertainty" between quarks in Lund and quarks in Herwig (not to mention real
quark jets in data) will not be so great as to make it impossible to distinguish
quarks from gluons.
B)Pattern Recognition and Neural Net Studies
We have also devoted a fair amount of effort to learning methods of calculation
from other fields which involve "cluster identification", "pattern recognition", etc.
These include various neural net techniques, mapping methods, etc. which are
designed to allow one to assign a label to a particular pattern of input data.
So far, our efforts have amounted to "brute force" applications of techniques
in the literature; these do not do very much better in jet labelling than a careful
analysis using our 97 classification bins and the jet mass. However, some of them
lead to equally good results with a much smaller number of bins.
We have had some guidance in our study of the neural network, pattern recogni-
tion, etc. literature from people at the UIUC Beckman Institute; we must mention
in particular Stephane Herbin and Klaus Schulten. This work is still very much
in a "start-up" phase. This summer an undergraduate student and a graduate
student from the physics department will join L.M. Jones and Mary Ann Graham
in this effort; we hope that it will be possible to concentrate a lot of manpower on
the problem during that period and settle on one or two "best" methods.
Recently, Mary Ann Graham passed the "prelim" exam; this means that she
will be able to concentrate most of her time on research for the PhD thesis. Some
aspect of this jet identification project will probably form the bulk of that thesis.
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Research on elementary particle physics: Task P, Studies in theory and phenomenology of elementary particles, report, May 1, 1992; United States. (https://digital.library.unt.edu/ark:/67531/metadc1057609/m1/3/: accessed March 21, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.