The European Physical Journal C > 2015 > 75 > 2 > 1-35
Measurement of electroweak production of two jets in association with a Z boson in proton–proton collisions at $$\sqrt{s}=8\,\text {TeV}$$ s = 8 TeV
Source
Abstract
The purely electroweak (EW) cross section for the production of two jets in association with a Z boson, in proton–proton collisions at $$\sqrt{s}=8\,\text {TeV}$$ s = 8 TeV , is measured using data recorded by the CMS experiment at the CERN LHC, corresponding to an integrated luminosity of 19.7 $$\,\text {fb}^\text {-1}$$ fb -1 . The electroweak cross section for the $$\ell \ell \mathrm {jj}$$ ℓ ℓ jj final state (with $$\ell = \mathrm {e}$$ ℓ = e or $$\mu $$ μ and j representing the quarks produced in the hard interaction) in the kinematic region defined by $$M_{\ell \ell } >50$$ M ℓ ℓ > 50 $$\,\text {GeV}$$ GeV , $$M_\mathrm {jj} >120$$ M jj > 120 $$\,\text {GeV}$$ GeV , transverse momentum $$p_\mathrm {T j}> 25$$ p T j > 25 $$\,\text {GeV}$$ GeV , and pseudorapidity $$|\eta _\mathrm {j} |< 5$$ | η j | < 5 , is found to be $$\sigma _\mathrm {EW}(\ell \ell \mathrm {jj})=174 \pm 15\,\text {(stat)}\pm 40\,\text {(syst)}\text {\,fb}$$ σ EW ( ℓ ℓ jj ) = 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.
Identifiers
journal ISSN : | 1434-6044 |
journal e-ISSN : | 1434-6052 |
DOI | 10.1140/epjc/s10052-014-3232-5 |