Measurements of the $ZZ$ production cross sections in the $2\ell2\nu$ channel in proton-proton collisions at $\sqrt{s}$ = 7 and 8 TeV and combined constraints on triple gauge couplings

Khachatryan, Vardan

doi:10.1140/epjc/s10052-015-3706-0

Title: Measurements of the $ZZ$ production cross sections in the $$2\ell2\nu$$ channel in proton-proton collisions at $$\sqrt{s}$$ = 7 and 8 TeV and combined constraints on triple gauge couplings

Journal Article · Thu Oct 29 00:00:00 EDT 2015 · European Physical Journal. C, Particles and Fields (Online)

DOI:https://doi.org/10.1140/epjc/s10052-015-3706-0· OSTI ID:1221280

Khachatryan, Vardan ^[1]

Yerevan Physics Inst. (YerPhI), Yerevan (Armenia). et al.

Measurements of the ZZ production cross sections in proton–proton collisions at center-of-mass energies of 7 and 8 TeV are presented. We found that candidate events for the leptonic decay mode ZZ → 2l2ν, where l denotes an electron or a muon, are reconstructed and selected from data corresponding to an integrated luminosity of 5.1 (19.6)fb^-1 at 7 (8) TeV collected with the CMS experiment. The measured cross sections, σ(pp → ZZ)=5.1^+1.5_-1.4(stat)^+1.4_-1.1(syst)±0.1(lumi)pb at 7 TeV, and 7.2^+0.8_-0.8(stat)^+1.9_-1.5(syst)±0.2(lumi)pb at 8 TeV, are in good agreement with the standard model predictions with next-to-leading-order accuracy. Furthermore, the selected data are analyzed to search for anomalous triple gauge couplings involving the ZZ final state. In the absence of any deviation from the standard model predictions, limits are set on the relevant parameters. As a result, these limits are then combined with the previously published CMS results for ZZ in 4l final states, yielding the most stringent constraints on the anomalous couplings.

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Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Contributing Organization:: CMS Collaboration

Grant/Contract Number:: AC02-07CH11359

OSTI ID:: 1221280

Report Number(s):: FERMILAB-PUB-15-114-CMS; CERN-PH-EP-2015-029; CMS-SMP-12-016; arXiv eprint number arXiv:1503.05467

Journal Information:: European Physical Journal. C, Particles and Fields (Online), Vol. 75, Issue 10; ISSN 1434-6052

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 30 works

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