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| Report number | ATL-COM-PHYS-2008-023 | ||||||||||||||
| Title | ATLAS H->WW Detection Sensitivity with Boosted Decision Trees | ||||||||||||||
| Other report number(s) | CERN-ATL-COM-PHYS-2008-023 | ||||||||||||||
| Author(s) | Yang, H ; Dai, T ; Levin, D ; Li, X ; Wilson, A ; Zhao, Z ; Zhou, B | ||||||||||||||
| Affiliation | (CERN) | ||||||||||||||
| Submitted by | hyang@cern.ch on 05 Mar 2008 | ||||||||||||||
| Subject category | Detectors and Experimental Techniques | ||||||||||||||
| Accelerator/Facility, Experiment | CERN LHC ; ATLAS | ||||||||||||||
| Free keywords | SM Higgs ; Boosted Decision Trees ; Higgs decays to WW ; HIGGS | ||||||||||||||
| Abstract | We report a study of the SM Higgs discovery potential through the W-pair leptonic decay modes at the LHC with ATLAS detector. We used MC samples with full detector simulation and reconstruction of the ATLAS experiment to estimate the detection sensitivity for the reaction of H->WW. Boosted Decision Trees (BDT) pattern recognition algorithm is employed to improve the Higgs detection efficiency and sensitivity. For comparison, we also conduct the analysis with straight cuts to select the Higgs events. Our results show that the Higgs detection efficiency can be improved significantly by factors of 1.5-2 depending on Higgs mass with the BDT analysis compared to the straight-cut analysis. The Higgs discovery sensitivity would improve by ~25% when taking 20% systematic errors into account. We show that discovery for the SM Higgs through the W-pair leptonic decay modes could be achieved by using the first few fb$^{-1}$ integrated luminosity if Higgs boson mass is between 140 and 180 GeV. If Higgs mass is around 160 - 170 GeV, a 5$\sigma$ detection significance can be achieved with less than 1 $fb^{-1}$ integrated luminosity in H -> WW detection. | ||||||||||||||
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Record created 2008-03-05, last modified 2008-09-08
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