Performance of algorithms that reconstruct missing transverse momentum in s√= 8 TeV proton-proton collisions in the ATLAS detector

ATLAS; F. MONTICELLI

EUROPEAN PHYSICAL JOURNAL C - PARTICLES AND FIELDS

SPRINGER

Lugar: Berlin; Año: 2016

1434-6044

The reconstruction and calibration algorithms used to calculate missing transverse mo-mentum (E T miss ) with the ATLAS detector exploit energy deposits in the calorimeter andtracks reconstructed in the inner detector as well as the muon spectrometer. Variousstrategies are used to suppress effects arising from additional proton?proton interactions,called pileup, concurrent with the hard-scatter processes. Tracking information is used todistinguish contributions from the pileup interactions using their vertex separation alongthe beam axis. The performance of the E T miss reconstruction algorithms, especially withrespect to the amount of pileup, is evaluated using data collected in proton?proton colli-sions at a centre-of-mass energy of 8 TeV during 2012, and results are shown for a datasample corresponding to an integrated luminosity of 20.3 fb −1 . The simulation and mod-elling of E T miss in events containing a Z boson decaying to two charged leptons (electronsor muons) or a W boson decaying to a charged lepton and a neutrino are compared todata. The acceptance for different event topologies, with and without high transversemomentum neutrinos, is shown for a range of threshold criteria for E T miss , and estimatesof the systematic uncertainties in the E T miss measurements are presented.