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| CMS-SMP-14-018 | ||
| Evidence for the electroweak Zγ production in association with two jets and a search for anomalous quartic gauge couplings in pp collisions at √s= 8 TeV | ||
| CMS Collaboration | ||
| September 2015 | ||
| Abstract: Evidence for electroweak associated production of a Z boson, a photon and two jets, where the Z boson decays into electron or muon pairs, is presented. The measurement is based on a sample of proton-proton collisions collected by the CMS detector at a center of mass energy of 8 TeV, corresponding to an integrated luminosity of 19.7 fb−1. Limits on anomalous quartic gauge couplings are set with a binned profile likelihood method based on the MZγ distribution. | ||
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Links:
CDS record (PDF) ;
CADI line (restricted) ; Figures are also available from the CDS record. These preliminary results are superseded in this paper, PLB 770 (2017) 380. The superseded preliminary plots can be found here. |
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| Figures | |
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Figure 1:
Representative diagrams for EWK ℓℓγjj Productions at the LHC: (a) Bremsstrahlung, (b) Multiperipheral, (c) VBF with TGC, and (d) VBS with QGC processes. |
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Figure 2-a:
The Mjj distributions measured in (a) muon and (b) electron channels. The data (solid symbols with error bars representing the statistical uncertainties) are compared to background estimate based on data as described in the text convoluted with MC predictions for the signal contribution. The shadowed bands represent the full uncertainty on predictions as described in Section 6. The last bin is overflow bin that contains the events above 1200 GeV. |
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Figure 2-b:
The Mjj distributions measured in (a) muon and (b) electron channels. The data (solid symbols with error bars representing the statistical uncertainties) are compared to background estimate based on data as described in the text convoluted with MC predictions for the signal contribution. The shadowed bands represent the full uncertainty on predictions as described in Section 6. The last bin is overflow bin that contains the events above 1200 GeV. |
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Figure 3:
The upper limit on Standard Model EWK Zγ+two jets cross section, for muon channel and electron channel using CLs construction |
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Figure 4:
The distribution of events pass the final cut criteria for searching aQGCs. The last bin has been extended to include overflow evens. Errors in the plot are shown with statistical uncertainties for background and data (in bars), and theoretical uncertainties for aQGCs (in bands). |
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Figure 5-a:
Comparison of the limits on the dimension 8 AQGC parameters obtained from this study, together with results from WVγ production, same sign WW production, exclusive γγ→WW production at CMS and Wγγ production at ATLAS. |
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Figure 5-b:
Comparison of the limits on the dimension 8 AQGC parameters obtained from this study, together with results from WVγ production, same sign WW production, exclusive γγ→WW production at CMS and Wγγ production at ATLAS. |
| Tables | |
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Table 1:
Parameterized by Zγ mass, 95% CL shape-based exclusion limits listed for combined channels of each aQGC parameter, no form factor is applied. |
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Compact Muon Solenoid LHC, CERN |
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