Research on elementary particle physics: Task P, Studies in theory and phenomenology of elementary particles Page: 2 of 7
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Progress Report for 1992, DOE-FG02-91ER40677 Task P
Theory and Phenomenology
Over the last year, work has focussed on two areas: the phenomenology of
quark-gluon differentiation in jets, and theoretical studies involving Dirac-like e-
quations for various systems. Substantive progress has been made in both areas.
A paper comparing details of the Lund and Herwig simulations for quark and glu-
on jets has been written and accepted by Physical Review D. A paper describing
a new type of Dirac equation for the relativistic harmonic oscillator, and finding
solutions thereof, has been written and submitted for publication.
Progress in Phenomenology
We have continued our studies of jet labelling (i.e. the ability to discriminate
between quark and gluon jets). Let me summarize the different efforts.
A)Comparison of Jet Fragmentation Schemes
In an attempt to estimate the "theoretical error" involved in use of available
QCD Monte Carlo jet packages, we have used our 97 bin jet classification scheme
(previously published - see Phys. Rev. D42,pp 811-814) to compare the Herwig
and Lund packages. We used parameter sets for these two packages fit by the
OPAL collaboration to their data for e+e- -+ Zo -. hadrons; differences should
reflect different hadronization treatments.
There are noticeable differences between the Herwig and Lund results; we have
summarized these in a paper ("Comparison of Jet Fragmentation Schemes", by
Graham, Jones and Daumerie, accepted by Phys. Rev. D). The major point of
this paper is that our comparison method should be used with experimental data
* to see whether either simulation package can reproduce details.
The Herwig-Lund variation found suggests that detailed parameters obtained
from fitting simulated data will probably not exactly reproduce real data. Hence,
Here’s what’s next.
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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/m1/2/: accessed March 23, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.