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 relative to the direction
of the leading "charged particle jet" in the event, chgjet1.
The "transverse" region is defined by
60o <|| <120o
and |eta| < 1.
The "transverse" region is perpendicular to the plane of the hard 2-to-2 scattering and is very sensitive to
the "underlying event" component of the QCD Monte-Carlo models.
(Return)
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