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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

Abstract

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.

Authors:
 [1]
  1. Yerevan Physics Inst. (YerPhI), Yerevan (Armenia). et al.
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Org.:
CMS Collaboration
OSTI Identifier:
1221280
Report Number(s):
FERMILAB-PUB-15-114-CMS; CERN-PH-EP-2015-029; CMS-SMP-12-016
Journal ID: ISSN 1434-6052; arXiv eprint number arXiv:1503.05467
Grant/Contract Number:  
AC02-07CH11359
Resource Type:
Accepted Manuscript
Journal Name:
European Physical Journal. C, Particles and Fields (Online)
Additional Journal Information:
Journal Name: European Physical Journal. C, Particles and Fields (Online); Journal Volume: 75; Journal Issue: 10; Journal ID: ISSN 1434-6052
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Khachatryan, Vardan. 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. United States: N. p., 2015. Web. doi:10.1140/epjc/s10052-015-3706-0.
Khachatryan, Vardan. 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. United States. doi:10.1140/epjc/s10052-015-3706-0.
Khachatryan, Vardan. Thu . "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". United States. doi:10.1140/epjc/s10052-015-3706-0. https://www.osti.gov/servlets/purl/1221280.
@article{osti_1221280,
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},
author = {Khachatryan, Vardan},
abstractNote = {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.},
doi = {10.1140/epjc/s10052-015-3706-0},
journal = {European Physical Journal. C, Particles and Fields (Online)},
number = 10,
volume = 75,
place = {United States},
year = {2015},
month = {10}
}

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Works referenced in this record:

Vector boson pair production at the LHC
journal, July 2011

  • Campbell, John M.; Ellis, R. Keith; Williams, Ciaran
  • Journal of High Energy Physics, Vol. 2011, Issue 7
  • DOI: 10.1007/JHEP07(2011)018