Illustration of correlations in the azimuthal angle  relative to the direction
of the leading "calorimeter jet", jet1, in the event or relative to the
direction of the leading "charged particle jet" in the event, chgjet1.
The "toward" region is defined by || < 60o
and |eta| < 1 (includes particles in the leading jet), while the "away" region is defined by
|| > 120o
and |eta| < 1. The "transverse" region is defined by
60o <|| <120o
and |eta| < 1.
The "toward" region contains the
leading charged particle jet, while the "away" region, on the average, contains the away-side jet.
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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