Abstract

We present the results of a search for Standard Model Higgs to WW^* production in two charged lepton(e,μ) and two neutrino final state in pp collisions at 1.96 TeV center of mass energy. The data were collected with the CDF II detector at the Tevatron collider at Fermilab, and correspond to an integrated luminosity of 1.1 fb^-1. The Matrix Element method is used to calculate the event probability and construct a likelihood ratio discriminator. We find 323 candidates with an expectation of 286.1 +- 23.3 background and 3.9 +- 0.3 signal for Higgs mass 160GeV/c² at NNLL calculation. The observed 95\% C.L. limit is 1.3pb which is 3.4 times the Standard Model prediction while the median of expected limit is 4.8^+2.2_-1.4 with systematics included. Results for 9 other Higgs mass hypotheses ranging from 110GeV/c² to 200GeV/c² are also presented.

The results were firstly presented in Moriond QCD 2007. More details are refered to public note

General remarks

The preliminary results are blessed in March 16, 2007.

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