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2017:groups:tools:contur [2017/10/02 10:43] jonathan.butterworth |
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* [[http://contur.hepforge.org/share/plot-format.html|Explanation of Contur plot format]] | * [[http://contur.hepforge.org/share/plot-format.html|Explanation of Contur plot format]] | ||
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- | ==== 2HDM Studies ==== | ||
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- | //Kristin Lohwasser, Ken Lane, Jon Butterworth, David Grellscheid, Lukas Pritchett, ...// | ||
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- | === First look with default parameters === | ||
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- | Made in Les Houches, Masses as below, Beta = 0.0813, MixH = 0.0883 | ||
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- | * [[http://www.hep.ucl.ac.uk/~jmb/Work/2hdm/wplots8/ATLAS_2016_I1426515/index.html|8 TeV WW plots]] | ||
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- | === Proposed parameter scan from Ken === | ||
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- | Start with: | ||
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- | * m(h_1) = 125 GeV | ||
- | * m(h_2) = 30 GeV | ||
- | * m(h_3) = 30 GeV | ||
- | * beta = arcsin(v2/246 GeV) = 0.05084 for v2 = 12.5 GeV (and = 0.08139 20 GeV, if you feel ambitious) | ||
- | * mixh = beta - alpha for alpha = -0.435 x 10^{-2} (and -0.695 x 10{-2} for v2 = 20 GeV; ditto) | ||
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- | The signal processes of interest are: | ||
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- | $$\begin{aligned} | ||
- | \bar{q} q \rightarrow \gamma, Z \rightarrow h^+ h^- \rightarrow \mu^+ \mu^- + E_T^{\rm missing} | ||
- | \\ \bar{d} u \rightarrow W^+ \rightarrow h^+ h_2 \ {\rm AND}\ h^+ h_3 \rightarrow \mu^+ \mu^+ \mu^- + E_T^{\rm missing}, \\ {\rm (plus\ charge\ conjugate\ )} \\ \bar{q} q \rightarrow Z \rightarrow h_2 h_3 -> \bar{b} b \mu^+ \mu^-\end{aligned}$$ | ||
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- | For these, you want to scan over $h^+$ mass from 95 GeV to 250 GeV. | ||
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- | === Update from Jon 18 Sept === | ||
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- | Here's a [[http://www.hep.ucl.ac.uk/~jmb/Work/LH/2HDM/8_WEAK/|first look]], for inclusive $h^+$ or $h^-$ production, 8 TeV, parameters as above and beta = 0.0508, mixh = 0.0547 and $m(h^{+/-}) = 100$ GeV. | ||
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- | Total cross section 1.8 pb. | ||
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- | Note that the ATLAS 4l result still has a lot of exclusion power, even though the $h_2 h_3$ production channel is switched off (with this switched on, the total cross section is ~346 pb). From looking at the Herwig logs, I think this contribution may come from events like $q\bar{q} \rightarrow h_2 h^+ \rightarrow h_2 h_3 \mu \nu$ with subsequent $h_2, h_3$ decays to muons. | ||
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- | However, you can see that the [[http://www.hep.ucl.ac.uk/~jmb/Work/LH/2HDM/8_WEAK/ATLAS_2016_I1426515/index.html|ATLAS WW measurement]] also has some exclusion - about 92%. I don't understand why the [[http://www.hep.ucl.ac.uk/~jmb/Work/LH/2HDM/8_WEAK/CMS_2017_I1467451/index.html|CMS H->WW]] one doesn't have an exclusion anywhere in the same league. Either the Higgs selection cuts suppress it or there is a bug/feature in the rivet routine (either ATLAS or CMS!). I will look into it. | ||
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