Jet and photon measurements from ATLAS
LIP (Laboratório de Instrumentação e Física Experimental de Particulas), Av. Elias Garcia 14-1°, 1000-149, Lisboa, Portugal
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Differential cross-section measurements of inclusive-jet and di-jet production provide stringent tests of perturbative QCD predictions and provide inputs for determination of parton density functions. Ratios of jet multiplicities are sensitive to αs and have reduced theoretical uncertainties. Measurements of the inclusive isolated-photon and di-photon cross-sections provide a direct probe of short-distance physics, complementary to that from measurements of jets or vector-bosons and are sensitive to the gluon density in the proton. The measurements are compared to next-to-leading-order or higher-order QCD calculations.
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