CDF Search for SM Higgs boson decays in the 4 lepton final state|
The Higgs particle is the last undiscovered particle of the Standard Model of
Particle Physics (SM). A search for SM Higgs decays in the four
lepton final state is conducted using 8.2 fb-1 of data of p-pbar collisions collected
by the CDF-II detector at Fermilab's Tevatron accelerator. We reconstruct
the three final states of four electrons (4e),
four muons (4μ) and pairs of electrons and muons (2e2μ) in the range
50 GeV/c² to 600 GeV/c² of the four lepton invariant mass.
Our search is optimized for Higgs decays to Z-boson pairs but is also sensitive to the
W-boson pair decay channel, where the Higgs is produced in association with a Z boson that
decays to charged leptons. We expect contributions from non-resonant ZZ production and fakes of
8.9 ± 1.2 and 0.3 ± 0.1 events, respectively.
In the data we observe 8 events, which is consistent
with no events from Higgs boson decays, therefore we extract upper limits for the cross-section of
Our most stringent limits above and below the threshold for on-shell production of ZZ are set at Higgs masses
of 150 GeV/c² and 200 GeV/c² with observed
cross-sections of above 15.5 and 9.3 times that of the SM ruled out at the
95% confidence level, respectively.
The results were first presented at EPS 2011
More details are provided in the public note
The preliminary results were blessed in the Higgs group on July 15, 2011
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Updated by Matteo Bauce
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Last updated: July 18 2011.