Combined Upper Limit on Standard Model Higgs Boson Production
at CDF for Summer 2006
Weiming Yao1), Yoshiaki Kusakabe2), Tatsuya Masubuchi3), Jason Nielsen1), Anyes Taffard4)
1)LBNL, 2)Waseda, 3)Tsukuba, 4)UIUC
Weiming Yao1), Yoshiaki Kusakabe2), Tatsuya Masubuchi3), Jason Nielsen1), Anyes Taffard4)
1)LBNL, 2)Waseda, 3)Tsukuba, 4)UIUC
Contents
1) Abstract
2) Documentation
3) Systematics
4) NNLO Cross Section
5) Bayesian Framework
6) Posterior Probability
7) Pseudo Experiment
8) Combination Result
1) Abstract
2) Documentation
3) Systematics
4) NNLO Cross Section
5) Bayesian Framework
6) Posterior Probability
7) Pseudo Experiment
8) Combination Result
1) Abstract
A combination of several searches for Standard Model Higgs boson production at CDF using a data sample up to 1fb-1 of integrated luminosity is performed. The channels cosidered are WH-> lνbb, ZH->ννbb, ZH->l-l+bb and gg -> H -> W+W-. The first two results have been recently updaed and the ZH->l+l-b b is newly available for the first time using a neural network technique in order to take advantage of clean final state. We have calculated combined upper limits on the ratio of Higgs boson cross sction times the branching ratio to its Standard Model prediction(R95) for Higgs boson masses between 110 and 200 GeV/c2. The results are in good agreement with the expectations obtained from background-only pseudo-experiments. The 95\% CL upper limits observed (expected) are factors of 12.8 (9.1) and 10.2 (11.4) higher than the Standard Model production cross sections for Higgs boson masses of 115 and 160,GeV/c2, respectively.
A combination of several searches for Standard Model Higgs boson production at CDF using a data sample up to 1fb-1 of integrated luminosity is performed. The channels cosidered are WH-> lνbb, ZH->ννbb, ZH->l-l+bb and gg -> H -> W+W-. The first two results have been recently updaed and the ZH->l+l-b b is newly available for the first time using a neural network technique in order to take advantage of clean final state. We have calculated combined upper limits on the ratio of Higgs boson cross sction times the branching ratio to its Standard Model prediction(R95) for Higgs boson masses between 110 and 200 GeV/c2. The results are in good agreement with the expectations obtained from background-only pseudo-experiments. The 95\% CL upper limits observed (expected) are factors of 12.8 (9.1) and 10.2 (11.4) higher than the Standard Model production cross sections for Higgs boson masses of 115 and 160,GeV/c2, respectively.
2) Documentation
| 0. Public Note | cdf-8403 | This Site | (previous result cdf-8326, website ) | |
| 1. Run1 Higgs Combined Limit | cdf-4985 | |||
| 2. WH -> lνbb w/ 1fb-1 | cdf-8390 | website | ||
| 3. ZH -> ννbb w/ 1fb-1 | To be uploaded | website | ||
| 4. ZH -> l+l-bb w/ 1fb-1 | To be uploaded | website | ||
| 5. gg -> H -> WW* -> llνν w/ 360pb-1 | cdf-7893 | website |
3) Systematic Unvertaities
*Positive values mean 100% correlation between channels
*Negative values mean uncorrelated between the channels
*Positive values mean 100% correlation between channels
*Negative values mean uncorrelated between the channels
4) Cross Section and Branching Ratio
* NNLO cross section and branching ratio
* Cross Section is from TeV4LHC Higgs working group
* Branching ratio is from John Conway's Calculation with HDECAY
* NNLO cross section and branching ratio
* Cross Section is from TeV4LHC Higgs working group
* Branching ratio is from John Conway's Calculation with HDECAY
5) Bayesian Framework
6) Posterior Probability
- Posterior probability distributions for each higgs mass as a function of (σ BR)95%/(σ BR)SM
- Posterior probability distributions for each higgs mass as a function of (σ BR)95%/(σ BR)SM
7) Pseudo Experiment
- Pseudo Experiments of combined results of (σ BR)95%/(σ BR)SM to see if the observed limit is reasonable enough
- Pseudo Experiments of combined results of (σ BR)95%/(σ BR)SM to see if the observed limit is reasonable enough
9) Result of the Limit Combination
CDF result
Combined limit of the Higgs boson searched at CDF. Limits for indivisual channels are also shown. Solid and dashed curves mean observed and expected limits respectively.
CDF result + D0 result (for Comparison)
Combined limit of the Higgs boson searched at CDF. Limits for indivisual channels are also shown. Solid and dashed curves mean observed and expected limits respectively. D0 result is also shown for comparison.
(CDF-D0 combination is not included here!)
Combined limit of the Higgs boson searched at CDF. Limits for indivisual channels are also shown. Solid and dashed curves mean observed and expected limits respectively.
Combined limit of the Higgs boson searched at CDF. Limits for indivisual channels are also shown. Solid and dashed curves mean observed and expected limits respectively. D0 result is also shown for comparison.
(CDF-D0 combination is not included here!)
Last Update on July 26, 2006 by Yoshiaki Kusakabe