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--- 2017:groups:tools:contur [2017/09/30 18:21]
jonathan.butterworth
+++ 2017:groups:tools:contur [2017/10/02 10:44] (current)
jonathan.butterworth
@@ Line 4: / Line 4: @@
   * [[https://contur.hepforge.org/|Contur at HepForge]]
   * [[http://contur.hepforge.org/svn/|Contur sources]] (CLTestSingle works. Many improvements in progress.)
-  * [[contur#2HDM Studies|2HDM Studies]]
+  * [[2HDM Studies]]
   * [[2017:groups:higgs:fxsnp:susycascades|FXS: Higgs production from SUSY cascades]]
   * [[Contur for Light Scalar Particles]]
   * [[http://contur.hepforge.org/share/plot-format.html|Explanation of Contur plot format]]
 --------------------------------------------------------------------------------
-==== 2HDM Studies ====
-//Kristin Lohwasser, Ken Lane, Jon Butterworth, David Grellscheid, Lukas Pritchett, ...//
-=== First look with default parameters ===
-Made in Les Houches, Masses as below, Beta = 0.0813, MixH = 0.0883
-  * [[http://www.hep.ucl.ac.uk/~jmb/Work/2hdm/wplots8/ATLAS_2016_I1426515/index.html|8 TeV WW plots]]
-=== Proposed parameter scan from Ken ===
-Start with:
-  * 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)
-The signal processes of interest are:
-$$\begin{aligned}
-\bar{q} q \rightarrow \gamma, Z \rightarrow h^+ h^- \rightarrow \mu^+ \mu^- + E_T^{\rm missing}
- \\ \bar{d} u \rightarrow W^+ \rightarrow h^+ h_2 \ {\rm AND}\ h^+ h_3 \rightarrow \mu^+ \mu^+ \mu^- + E_T^{\rm missing}, \\ {\rm (plus\ charge\ conjugate\ )} \\  \bar{q} q \rightarrow Z \rightarrow h_2 h_3 -> \bar{b} b \mu^+ \mu^-\end{aligned}$$
-For these, you want to scan over $h^+$ mass from 95 GeV to 250 GeV.
-=== Update from Jon 18 Sept ===
-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.
-Total cross section 1.8 pb.
-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.
-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.

Les Houches

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