Determination of jet calibration and energy resolution in proton-proton collisions at √s=8 TeV using the ATLAS detector

G. OTERO Y GARZON, ET. AL., THE ATLAS COLLABORATION

EUROPEAN PHYSICAL JOURNAL C - PARTICLES AND FIELDS

SPRINGER

Lugar: Berlin; Año: 2020

1434-6044

The jet energy scale, jet energy resolution, andtheir systematic uncertainties are measured for jets reconstructedwith the ATLAS detector in 2012 using proton?proton data produced at a centre-of-mass energy of 8 TeVwith an integrated luminosity of 20 fb−1. Jets are reconstructedfrom clusters of energy depositions in the ATLAScalorimeters using the anti-kt algorithm. A jet calibrationscheme is applied in multiple steps, each addressing specificeffects including mitigation of contributions from additionalproton?proton collisions, loss of energy in dead material,calorimeter non-compensation, angular biases and otherglobal jet effects. The final calibration step uses several insitu techniques and corrects for residual effects not capturedby the initial calibration. These analyses measure boththe jet energy scale and resolution by exploiting the transversemomentum balance in γ +jet, Z +jet, dijet, and multijetevents.Astatistical combination of thesemeasurements isperformed. In the central detector region, the derived calibrationhas a precision better than 1% for jets with transversemomentum 150 GeV < pT < 1500 GeV, and the relativeenergy resolution is (8.4 ± 0.6)% for pT = 100 GeV and(23 ± 2)% for pT = 20 GeV. The calibration scheme forjets with radius parameter R = 1.0, for which jets receive adedicated calibration of the jet mass, is also discussed.