Abstract
We search for the neutral higgs production associated with the W boson using
high-pT isolated like-sign dilepton events in ppbar collisions at
sqrt(s) = 1.96 TeV.
The data were collected with the CDF-II detector at the
Fermilab Tevatron collider and correspond to an integrated luminosity of 2.7
fb-1.
The expected number of backgrounds is 188 ± 24 for the events with the
first lepton pT larger than 20 GeV/c and the 2nd lepton
pT larger than 6 GeV/c in the CDF central region, |η| < 1.1,
while we observe 172 events in the data to find no significant disagreements.
The expected number of signal events is 1.03 for the fermiophobic higgs
of the mass 120 GeV/c2 assuming the Standard Model cross section
and 0.40 for the mass 160 GeV/c2.
The number of events for the Standard Model higgs is 0.14 and 0.38 for
120 GeV/c2 and 160 GeV/c2, respectively.
We apply Boosted Decision Tree technique for separating the backgrounds and
signal events to improve the search sensitivity, then calculate limits in the
Bayesian framework using the output distributions.
We obtain the limits on
σ(ppbar→Wh) × Br(h→W+W-)
of 1.80 pb for the higgs of 120 GeV/c2 and 1.23 pb for 160
GeV/c2 at the 95% confidence level.
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