UNIPD Logo Search for a low mass Standard Model Higgs boson in the &tau&tau decay channel

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Details of the analysis  

Tables and plots:

Z&rarr &tau&tau control region   W+jets control region   QCD control region
1 jet signal channel   &ge 2 jets signal channel
Key plots and summary tables for presentations
Expected and Observed Limits

Abstract:

We present the results of an updated search for the Standard Model (SM) Higgs boson production in the &tau&tau decay mode, using 6.0 fb-1 of integrated luminosity of CDF Run II data, collected at the Tevatron proton-antiproton collider at &radic 1.96 TeV.
The search is performed considering the following signal processes: WH(&rarr &tau&tau), ZH(&rarr &tau&tau), qHq'&rarr q &tau&tau q'(vector boson fusion) and gg&rarr H&rarr &tau&tau (gluon fusion).
We select the events by requiring that at least one of the two taus decays leptonically, while the other one is reconstructed by its hadronic decay products. The sensitivity of the search is enhanced by employing a multivariate discriminant based on a set of Boosted Decision Trees, separately optimized for events containing 1 jet and &ge 2 jets in the final state. We observe no evidence for a Higgs boson signal and therefore we set a 95% confidence level (C.L.) upper limit on the cross section times the branching ratio (B.R.) of the Higgs boson decaying to &tau pairs. Observed and expected limits, relative to SM predictions, are evaluated for Higgs boson masses varying from 100 GeV/c2 to 150 GeV/c2.

Supporting documents:

General Remarks:

  • The preliminary results were blessed in the Higgs Group on March the 11th 2011. They can be used in conference presentations with proper reference to the CDF Collaboration.
  • Please contact us if you have any questions about including these results in a presentation
  • Updated by P.Totaro
    Last updated: March 6th 2011.