The cross-section for the production of two jets in association with a leptonically decaying Z boson (Zjj) is measured in protonâ proton collisions at a centre-of-mass energy of 13 TeV, using data recorded with the ATLAS detector at the Large Hadron Collider, corresponding to an integrated luminosity of 3.2 fbâ 1. The electroweak Zjj cross-section is extracted in a fiducial region chosen to enhance the electroweak contribution relative to the dominant Drellâ Yan Zjj process, which is constrained using a data-driven approach. The measured fiducial electroweak cross-section is Ï EWZjj= 119±16(stat.)±20(syst.)±2(lumi.) fb for dijet invariant mass greater than 250 GeV, and 34.2±5.8(stat.)±5.5(syst.)±0.7(lumi.) fb for dijet invariant mass greater than 1 TeV. Standard Model predictions are in agreement with the measurements. The inclusive Zjj cross-section is also measured in six different fiducial regions with varying contributions from electroweak and Drellâ Yan Zjj production.
Measurement of the cross-section for electroweak production of dijets in association with a Z boson in pp collisions at s=13 TeV with the ATLAS detector
Donati, S.;Francavilla, P.;Roda, C.;Verducci, M.;
2017-01-01
Abstract
The cross-section for the production of two jets in association with a leptonically decaying Z boson (Zjj) is measured in protonâ proton collisions at a centre-of-mass energy of 13 TeV, using data recorded with the ATLAS detector at the Large Hadron Collider, corresponding to an integrated luminosity of 3.2 fbâ 1. The electroweak Zjj cross-section is extracted in a fiducial region chosen to enhance the electroweak contribution relative to the dominant Drellâ Yan Zjj process, which is constrained using a data-driven approach. The measured fiducial electroweak cross-section is Ï EWZjj= 119±16(stat.)±20(syst.)±2(lumi.) fb for dijet invariant mass greater than 250 GeV, and 34.2±5.8(stat.)±5.5(syst.)±0.7(lumi.) fb for dijet invariant mass greater than 1 TeV. Standard Model predictions are in agreement with the measurements. The inclusive Zjj cross-section is also measured in six different fiducial regions with varying contributions from electroweak and Drellâ Yan Zjj production.| File | Dimensione | Formato | |
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Cross section for electroweak production.pdf
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