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The average number of "transverse" charged particles
(PT > 0.5 GeV/c, |eta| < 1)
as a function of the transverse momentum of the leading charged jet. Each point
corresponds to the <Nchg> in a 1 GeV/c bin. The data are compared with the QCD
Monte-Carlo model predictions of HERWIG 5.9, with its default parameters and
PT(hard) > 3 GeV/c. The predictions of HERWIG are
divided into two categories: charged particles that arise from the break-up of the beam particles
("beam-beam remnants"), and charged particles that result from the outgoing jets plus initial
and final-state radiation ("hard scattering component").
The Monte-Carlo model predictions have been corrected for the CTC track finding efficiency
(8% of the charged tracks are, on the average, removed) and have an uncertainty
(statistical plus systematic) of about 5%.
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