2017:groups:higgs:inter
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2017:groups:higgs:inter [2017/06/20 16:23] stefan.liebler |
2017:groups:higgs:inter [2017/06/23 10:06] (current) olivier.mattelaer |
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| ===== Interference effects in the search for heavy Higgs bosons ===== | ===== Interference effects in the search for heavy Higgs bosons ===== | ||
| - | //Interested people: Stefan Liebler, Jérémie Quevillon, Sabine Kraml [add your names]// | + | //Interested people: Stefan Liebler, Jérémie Quevillon, Sabine Kraml, Alexandra Carvalho, Ramona Gröber, Tetiana Berger-Hryn'ova, Fabio Maltoni [add your names]// |
| Motivation: | Motivation: | ||
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| Idea: | Idea: | ||
| - | To classify the free parameters setting the interference terms starting with the $VV$ final state. Try to provide a guidance where interferences are expected to be sizable. | + | To classify the free parameters setting the interference terms starting with the $VV$ and $HH$ final states. Try to provide a guidance where interferences are expected to be sizable. |
| The below table gives a hint where large interference among the heavy Higgs bosons $\phi_i$, the SM Higgs $H$ and the SM background $B$ are to be expected depending on the final state under consideration:\\ | The below table gives a hint where large interference among the heavy Higgs bosons $\phi_i$, the SM Higgs $H$ and the SM background $B$ are to be expected depending on the final state under consideration:\\ | ||
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| The final state $HH$ is (also) discussed in the [[2017:groups:higgs:2h | di-Higgs group]]. | The final state $HH$ is (also) discussed in the [[2017:groups:higgs:2h | di-Higgs group]]. | ||
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| + | Discussion 20/06/2017: | ||
| + | |||
| + | {{:2017:groups:higgs:img_20170620_183954.jpg?400| Blackboard}} | ||
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| + | Discussion 22/06/2017: | ||
| + | |||
| + | Work plan: | ||
| + | - Calculate $d\sigma^X/dm_{VV}$ or $dm_{HH}$ for $gg\to VV/HH$ at LO QCD and at partonic level for $X=S,I_B$ and $I_H$ for the subsequent parameters and store them as a function of $m_{VV}/m_{HH}$ in a table that ranges from $m_\Phi-10\Gamma_\Phi$ to $m_\Phi+10\Gamma_\Phi$ with sufficient data points: | ||
| + | - $VV$: $c_ge^{i\theta_g}$, $m_\Phi$, $\Gamma_\Phi$, $\kappa_V$ (in a first step choose $\sqrt{1-\kappa_V^2}$ for the SM $HVV$ coupling). | ||
| + | - $HH$: $c_ge^{i\theta_g}$, $m_\Phi$, $\Gamma_\Phi$, $\lambda_{Hhh}, \lambda_{hhh}$ | ||
| + | - Read in the table (with Mathematica) and calculate relative correction factors named $(\eta^-,\eta^+,\eta)$, see slides, or apply a similar method (e.g. arXiv:1510.03450) to quantify the relevance of the interferences. | ||
| + | - Try to classify the relevant regions, where interferences are of relevance (check also $\Gamma_\Phi/m_\Phi\cdot \sigma^S/\sigma^B$). | ||
| **References: ** | **References: ** | ||
| Line 42: | Line 55: | ||
| $HH$: | $HH$: | ||
| - Higgs pair production via gluon fusion in the Two-Higgs-Doublet Model, B. Hespel, D. Lopez-Val, E. Vryonidou [[https://arxiv.org/pdf/1407.0281.pdf | arXiv:1407.0281 ]] | - Higgs pair production via gluon fusion in the Two-Higgs-Doublet Model, B. Hespel, D. Lopez-Val, E. Vryonidou [[https://arxiv.org/pdf/1407.0281.pdf | arXiv:1407.0281 ]] | ||
| + | - NLO Corrections to Double Higgs Production in the Higgs Singlet Model, S. Dawson, I. Lewis [[https://arxiv.org/pdf/1508.05397.pdf | arXiv:1508.05397 ]] | ||
| **for two interfering heavy Higgs bosons:** | **for two interfering heavy Higgs bosons:** | ||
2017/groups/higgs/inter.1497968624.txt.gz · Last modified: 2017/06/20 16:23 by stefan.liebler
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