Search for the Standard Model Higgs Boson in ZH → μ+μ-b$$\bar{b}$$ Production at DØ and Evidence for the H→ b$$\bar{b}$$ Decay at the Tevatron
- Univ. of Michigan, Ann Arbor, MI (United States)
search for ZH → μ+μ-b$$\bar{b}$$ is presented, using a Run 2 dataset with an integrated luminosity of 9.7 fb-1 collected by the DØ detector. Selected events contain at least two reconstructed jets and a Z candidate reconstructed with two opposite-sign charged muons. Random forests of decision trees are trained to distinguish between signal and background events in two orthogonal b-tag samples. The ZH → μ+μ-b$$\bar{b}$$b analysis is then combined with ZH → e+e-b$$\bar{b}$$ analysis. For the combined results of ZH → ℓ+ℓ-b$$\bar{b}$$b, no Higgs signal is observed, limits are set on the ZH cross-section BR(H→ b$$\bar{b}$$) for different Higgs masses, from 90 to 150 GeV. For a Standard Model (SM) Higgs boson of mass 125 GeV, the observed cross-section limit is 7.1 times the SM cross-section with an expected sensitivity of 5.1 times the SM cross section. The result of ZH → ℓ+ℓ-b$$\bar{b}$$b channel has been combined with searches in other Higgs decay channels at the Tevatron, which led to the first evidence of H → b$$\bar{b}$$.
- 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:
- 1155870
- Report Number(s):
- FERMILAB-THESIS-2014-12
- Country of Publication:
- United States
- Language:
- English
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