Search for the Higgs Boson in the $$ZH\to\mu^+\mu^- b\bar{b}$$ Channel at CDF Using Novel Multivariate Techniques
- Ohio State U.
We present a search for the Standard Model Higgs Boson using the process $$ZH\to\mu^+\mu^- b\bar{b}$$. We use a dataset corresponding to 9.2 fb$$^{-1}$$ of integrated luminosity from proton-antiproton collisions with center-of-mass energy 1.96 TeV at the Fermilab Tevatron, collected with the CDF II detector. This analysis benefits from several new multivariate techniques that have not been used in previous analyses at CDF. We use a multivariate function to select muon candidates, increasing signal acceptance while simultaneously keeping fake rates small. We employ an inclusive trigger selection to further increase acceptance. To enhance signal discrimination, we utilize a multi-layer approach consisting of expert discriminants. This multi-layer discriminant method helps isolate the two main classes of background events, $$t\bar{t}$$ and $$Z$$+jets production. It also includes a flavor separator, to distinguish light flavor jets from jets consistent with the decay of a $$B$$-hadron. Wit h this novel multi-layer approach, we proceed to set limits on the $ZH$ production cross section times branching ratio. For a Higgs boson with mass 115 GeV/$c^2$, we observe (expect) a limit of 8.0 (4.9) times the Standard Model prediction.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1249483
- Report Number(s):
- FERMILAB-THESIS-2011-42; 1088202
- Country of Publication:
- United States
- Language:
- English
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