The purely electroweak (EW) cross section for the production of two jets in association with a Z boson, in proton–proton collisions at √s = 8 TeV, is measured using data recorded by the CMS experiment at the CERN LHC, corresponding to an integrated luminosity of 19.7 fb−1. The electroweak cross section for the lljj final state (with l = e or μ and j representing the quarks produced in the hard interaction) in the kinematic region defined by Mll > 50 GeV, Mjj > 120 GeV, transverse momentum pTj > 25 GeV, and pseudorapidity |ηj| < 5, is found to be σEW(lljj) = 174 ± 15 (stat) ± 40 (syst) fb, in agreement with the standard model prediction. The associated jet activity of the selected events is studied, in particular in a signal-enriched region of phase space, and the measurements are found to be in agreement with QCD predictions.
Measurement of electroweak production of two jets in association with a Z boson in proton–proton collisions at √s=8TeV
Sola, V.;AMAPANE, Nicola Carlo;ARGIRO', Stefano;BELLAN, Riccardo;CASASSO, STEFANO;COSTA, Marco;DEGANO, Alessandro;FINCO, LINDA;MIGLIORE, Ernesto;MONACO, Vincenzo;OBERTINO, Maria Margherita;ORTONA, GIACOMO;PACHER, LUCA;PINNA ANGIONI, GIAN LUCA;POTENZA, ALBERTO;ROMERO, Alessandra;SACCHI, Roberto;SOLANO, Ada Maria;COVARELLI, Roberto;
2015-01-01
Abstract
The purely electroweak (EW) cross section for the production of two jets in association with a Z boson, in proton–proton collisions at √s = 8 TeV, is measured using data recorded by the CMS experiment at the CERN LHC, corresponding to an integrated luminosity of 19.7 fb−1. The electroweak cross section for the lljj final state (with l = e or μ and j representing the quarks produced in the hard interaction) in the kinematic region defined by Mll > 50 GeV, Mjj > 120 GeV, transverse momentum pTj > 25 GeV, and pseudorapidity |ηj| < 5, is found to be σEW(lljj) = 174 ± 15 (stat) ± 40 (syst) fb, in agreement with the standard model prediction. The associated jet activity of the selected events is studied, in particular in a signal-enriched region of phase space, and the measurements are found to be in agreement with QCD predictions.File | Dimensione | Formato | |
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