Pure Samples of Quark and Gluon Jets at the LHC. (arXiv:1104.1175v1 [hep-ph])

Having pure samples of quark- and gluon-initiated jets would greatly
facilitate the study of jet properties and substructure, with many potential
standard model and new physics applications. To this end, we consider multijet
and jets+X samples, to determine the purity that can be achieved by simple
kinematic cuts leaving reasonable production cross sections. We find, for
example, that at the 7 TeV LHC, the pp \rightarrow gamma+2jets sample can
provide 98% pure quark jets with 200 GeV of transverse momentum and a cross
section of 5 pb. To get 10 pb of 200 GeV jets with 90% gluon purity, the pp
\rightarrow 3jets sample can be used. b+2jets is also useful for gluons, but
only if the b-tagging is very efficient. This study is done only at the
parton-level, where quark and gluon jets are well-defined.

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