INVESTIGADORES
MONTICELLI Fernando Gabriel
artículos
Título:
Measurement of the ZZ production cross section and limits on anomalous neutral triple gauge couplings in proton-proton collisions at √s =7 TeV with the ATLAS detector
Autor/es:
ATLAS COLLABORATION, G. AAD, F. MONTICELLI, ET AL
Revista:
PHYSICAL REVIEW LETTERS
Editorial:
AMER PHYSICAL SOC
Referencias:
Lugar: New York; Año: 2012 vol. 231 p. 1 - 23
ISSN:
0031-9007
Resumen:
A measurement of the ZZ production cross section in proton-proton
collisions at sqrt(s) = 7 TeV using data recorded by the ATLAS
experiment at the LHC is presented. In a data sample corresponding to an
integrated luminosity of 1.02 fb^-1 collected in 2011, 12 events
containing two Z boson candidates decaying to electrons and/or muons are
observed. The expected background contribution is 0.3 +/- 0.3 (stat)
^{+0.4}_{-0.3} (syst.) events. The cross section measured in a
phase-space region with good detector acceptance and for dilepton masses
within the range 66 GeV to 116 GeV is sigma_{ZZ to ll ll}^{fid} =
19^{+6}_{-5} (stat.) +/- 1 (syst.) +/- 1 (lumi.) fb. This result is then
used to derive the total cross section for on-shell ZZ production,
sigma_{ZZ}^{tot}= 8.5^{+2.7}_{-2.3} (stat.)^{+0.4}_{-0.3} (syst.) +/-
0.3 (lumi.) pb, which is consistent with the Standard Model expectation
of 6.5^{+0.3}_{-0.2} pb calculated at the next-to-leading order in QCD.
Limits on anomalous neutral triple gauge boson couplings are derived.