Performance of missing transverse momentum reconstruction with the ATLAS detector using proton-proton collisions at $\sqrt{s}$ = 13 TeV

• Main Author: ATLAS collaboration (2867 authors)
• Publication Date: 2018
• Other Authors: Aguilar Saavedra, Juan Antonio, Amor Dos Santos, Susana Patricia, Anjos, Nuno, Araque Espinosa, Juan Pedro, Castro, Nuno Filipe, Conde Mui\~no, Patricia, Da Cunha Sargedas De Sousa, Mario Jose, Fiolhais, Miguel, Galhardo, Bruno, Gomes, Agostinho, Goncalo, Ricardo, Jorge, Pedro, Machado Miguens, Joana, Maio, Amelia, Maneira, Jose, Oleiro Seabra, Luis Filipe, Onofre, Ant\'onio, Costa Batalha Pedro, Rute, Santos, Helena, Saraiva, Joao, Silva, Jose Manuel, Tavares Delgado, Ademar, Veloso, Filipe, Wolters, Helmut
• Format: Article
• Language: eng
• Source: Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
• Download full: http://dx.doi.org/10.1140/epjc/s10052-018-6288-9; http://hdl.handle.net/10400.26/27585

The performance of the missing transverse momentum ( $E_{\mathrm{T}}^{\mathrm{miss}}$ ) reconstruction with the ATLAS detector is evaluated using data collected in proton–proton collisions at the LHC at a centre-of-mass energy of 13 TeV in 2015. To reconstruct $E_{\mathrm{T}}^{\mathrm{miss}}$ , fully calibrated electrons, muons, photons, hadronically decaying $\tau \text {-leptons}$ , and jets reconstructed from calorimeter energy deposits and charged-particle tracks are used. These are combined with the soft hadronic activity measured by reconstructed charged-particle tracks not associated with the hard objects. Possible double counting of contributions from reconstructed charged-particle tracks from the inner detector, energy deposits in the calorimeter, and reconstructed muons from the muon spectrometer is avoided by applying a signal ambiguity resolution procedure which rejects already used signals when combining the various $E_{\mathrm{T}}^{\mathrm{miss}}$ contributions. The individual terms as well as the overall reconstructed $E_{\mathrm{T}}^{\mathrm{miss}}$ are evaluated with various performance metrics for scale (linearity), resolution, and sensitivity to the data-taking conditions. The method developed to determine the systematic uncertainties of the $E_{\mathrm{T}}^{\mathrm{miss}}$ scale and resolution is discussed. Results are shown based on the full 2015 data sample corresponding to an integrated luminosity of $3.2~\hbox {fb}^{-1}$ .