Abstract
The ATLAS Collaboration has performed precise measurements of the cross-section of final states with photons and/or jets at centre-of-mass energies of 8 and 13 TeV. The results are compared with state-of-the-art theory predictions and with predictions of several Monte Carlo generators. We also present new measurements of transverse energy-energy correlations and their associated asymmetries in multi-jet events at 8 TeV. Both measurements are used to extract the strong coupling constant and test the renormalization group equations.
Highlights
The modeling of a proton-proton collision at the Large Hadron Collider (LHC) can be divided in four main steps
The hard-scatter process is described by perturbative quantum chromodynamics and it depends on the parton distribution function (PDF) of the protons
Photons are a hard colourless probe of the hard-scatter process, which provides a good test of perturbative quantum chromodynamics (pQCD) calculations and helps constrain the proton PDF
Summary
The modeling of a proton-proton collision at the Large Hadron Collider (LHC) can be divided in four main steps. Photons are a hard colourless probe of the hard-scatter process, which provides a good test of pQCD calculations and helps constrain the proton PDF. Monte Carlo (MC) simulations are used to correct the effects of detector efficiency and resolution in both photon and jet measurements in order to compare them to theory predictions at particle level. This allows ATLAS data to be confronted to PDF models and perturbative calculations and to test the modeling of factorisation and hadronisation. The production of jets and prompt isolated photons at hadron colliders provides a stringent test of pQCD and can be used to probe the proton structure. We present new measurements of transverse energy-energy correlations (TEEC) and their associated asymmetries (ATEEC) in multi-jet events at 8 TeV and the extraction of the strong coupling constant from them
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