Abstract
A measurement is presented of the cross section for the electroweak production of a W boson in association with two jets in proton-proton collisions at a center-of-mass energy of 8 TeV. The data set was collected with the CMS detector and corresponds to an integrated luminosity of 19.3 inverse femtobarns. The measured fiducial cross section for W bosons decaying to electrons or muons and for pT(j1) > 60 GeV, pT(j2) > 50 GeV, |eta(j)| < 4.7, and m(jj) > 1000 GeV is 0.42 +/- 0.04 (stat) +/- 0.09 (syst) +/- 0.01 (lumi) pb. This result is consistent with the standard model leading-order prediction of 0.50 +/- 0.02 (scale) +/- 0.02 (PDF) pb obtained with MADGRAPH5_aMC@NLO 2.1 interfaced to PYTHIA 6.4. This is the first cross section measurement for this process.
Highlights
Background estimation and signal extractionThe EW W(→ τ ν)+2-jets events, with the τ leptons decaying to electrons or muons, have signatures similar to those for signal events and they represent 4% (5%) of the signal sample in the electron channel as estimated from simulation
The measured fiducial cross section for W bosons decaying to electrons or muons and for pTj1 > 60 GeV, pTj2 > 50 GeV, |ηj| < 4.7, and mjj > 1000 GeV is 0.42 ± 0.04 ± 0.09 ± 0.01 pb
This result is consistent with the standard model leading-order prediction of 0.50 ± 0.02 ± 0.02 (PDF) pb obtained with MadGraph5 amc@nlo 2.1 interfaced to pythia 6.4
Summary
The central feature of the CMS apparatus is a superconducting solenoid of 6 m internal diameter. Forward calorimeters extend the pseudorapidity [14] coverage provided by the barrel and endcap detectors. The silicon tracker measures charged particles within the pseudorapidity range |η| < 2.5. It consists of 1440 silicon pixel and 15 148 silicon strip detector modules and is located in the 3.8 T field of the superconducting solenoid. Matching muons to tracks measured in the silicon tracker results in a relative pT resolution for muons with 20 < pT < 100 GeV of 1.3–2.0% in the barrel and better than 6% in the endcaps. The first level of the CMS trigger system, composed of custom hardware processors, uses information from the calorimeters and muon detectors to select the events of interest in a fixed time interval of less than 4 μs. A more detailed description of the CMS detector, together with a definition of the coordinate system used and the relevant kinematic variables, can be found in ref. [14]
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