Light-quark and gluon jet discrimination in pp collisions at s=7TeV with the ATLAS detector

A likelihood-based discriminant for the identification of quark- and gluon-initiated jets is built and validated using 4.7 fb-1$$^{-1}$$ of proton–proton collision data at s=7$$\sqrt{s}=7$$ TeV$$\mathrm {\ TeV}$$ collected with the ATLAS detector at the LHC. Data samples with enriched quar