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| Publications [#309612] of Seog Oh
Papers Published
- al, DAE, The Underlying event in hard interactions at the Fermilab Tevatron p-barp collider,
Physical Review, vol. D70 no. 7
(October, 2004),
pp. 072002, American Physical Society (APS) [doi]
(last updated on 2026/01/19)
Abstract:
For comparison of inclusive jet cross
sections measured at
hadron-hadron colliders to next-to-leading
order (NLO)
parton-level calculations, the energy
deposited in the jet
cone by spectator parton interactions must
first be
subtracted. The assumption made at the
Tevatron is that
the spectator parton interaction energy is
similar to the
ambient level measured in minimum bias
events. In this
paper, we test this assumption by measuring
the ambient
charged track momentum in events containing
large
transverse energy jets at sqrt[s]=1800 GeV and
sqrt[s]=630 GeV and comparing this ambient
momentum
with that observed both in minimum bias
events and with
that predicted by two Monte Carlo models. Two
cones in
eta - phi space are defined, at the same
pseudorapidity,
eta , as the jet with the highest transverse
energy (E(1)T),
and at ±90o in the azimuthal direction, phi .
The total
charged track momentum inside each of the two
cones is
measured. The minimum momentum in the two
cones is
almost independent of E(1)T and is similar to
the
momentum observed in minimum bias events,
whereas
the maximum momentum increases roughly
linearly with
the jet E(1)T over most of the measured
range. This study
was carried out using data from the CDF
detector taken
during Run 1 (1994-1995). The study will help
improve
the precision of comparisons of jet cross
section data and
NLO perturbative QCD predictions. The
distribution of the
sum of the track momenta in the two cones is
also
examined for five different E(1)T bins. The
HERWIG and
PYTHIA Monte Carlo generators are reasonably
successful
in describing the data, but neither can describe
completely all of the event properties.
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