Abstract
This paper presents a measurement of ZZ production with the ATLAS detector at the Large Hadron Collider. The measurement is carried out in the final state with two charged leptons and two neutrinos, using data collected during 2015 and 2016 in pp collisions at sqrt{s} = 13 TeV, corresponding to an integrated luminosity of 36.1 fb−1. The integrated cross-sections in the total and fiducial phase spaces are measured with an uncertainty of 7% and compared with Standard Model predictions, and differential measurements in the fiducial phase space are reported. No significant deviations from the Standard Model predictions are observed, and stringent constraints are placed on anomalous couplings corresponding to neutral triple gauge-boson interactions.
Highlights
Background estimationAfter the event selection, the overall signal-to-background ratio is about 1.7
This paper presents a measurement of Z√Z production using 36.1 fb−1 of data collected with the ATLAS detector in pp collisions at s = 13 TeV
The understanding of the pT spectrum in the fiducial phase space is crucial for the study of aTGCs, and the predictions from the two generators differ by up to 10% for pT around 300 GeV, which is slightly above the theoretical uncertainty of the Powheg prediction
Summary
The ATLAS detector [17,18,19] is a large multi-purpose detector with a forward-backward symmetric cylindrical geometry and nearly 4π coverage in solid angle. It consists of an inner tracking detector surrounded by a thin superconducting solenoid, electromagnetic and hadronic calorimeters, and a muon spectrometer incorporating three large superconducting toroidal magnets each having eight coils assembled radially and symmetrically around the beam axis. The ATLAS detector [17,18,19] is a large multi-purpose detector with a forward-backward symmetric cylindrical geometry and nearly 4π coverage in solid angle.2 It consists of an inner tracking detector surrounded by a thin superconducting solenoid, electromagnetic and hadronic calorimeters, and a muon spectrometer incorporating three large superconducting toroidal magnets each having eight coils assembled radially and symmetrically around the beam axis. A high-granularity silicon pixel detector covers the vertex region and usually provides four measurements per track. The pixel detector is followed by a silicon microstrip tracker which usually provides four measurement points per track. The first-level trigger is implemented in hardware and uses a subset of the detector information This is followed by the software-based high-level trigger, reducing the event rate to about 1 kHz
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