2017:groups:higgs:fxsnp
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2017:groups:higgs:fxsnp [2017/06/22 10:02] sabine.kraml |
2017:groups:higgs:fxsnp [2017/06/26 19:17] (current) sabine.kraml |
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| ===== Using Higgs fiducial cross sections and differential distributions to constrain new physics ===== | ===== Using Higgs fiducial cross sections and differential distributions to constrain new physics ===== | ||
| - | Interested people: Kentarou, Sabine, Benj, Stefania, Stefan, Jérémie, Ursula, Kristin, Fabio... **add your name if interested** | + | Interested people: Kentarou, Sabine, Benj, Stefania, Stefan, Jérémie, Ursula, Kristin, Fabio, Andy **add your name if interested** |
| The use of signal strength measurements (kappa framework, reduced couplings...) for constraining deviations from the SM is well established, and public tools (HiggsSignals, Lilith) exist for performing fits to the data. Two limitations of the signal strength approach are that it assumes | The use of signal strength measurements (kappa framework, reduced couplings...) for constraining deviations from the SM is well established, and public tools (HiggsSignals, Lilith) exist for performing fits to the data. Two limitations of the signal strength approach are that it assumes | ||
| Line 16: | Line 16: | ||
| * X -> h+l, h+gamma, h+jet, h+b, h+t | * X -> h+l, h+gamma, h+jet, h+b, h+t | ||
| - | ATLAS 8 TeV Rivet routines are easily converted to CMS8TeV and/or 13 TeV measurements; numbers to be taken from plots or hepdata. | + | ATLAS 8 TeV Rivet routines are easily converted to CMS8TeV and/or 13 TeV measurements; plots however need to be digitalised, not all is on hepdata. |
| One interesting point would be to identify what can be done with and without this. Checking how constraints vary. | One interesting point would be to identify what can be done with and without this. Checking how constraints vary. | ||
| + | |||
| + | See also this [[https://indico.cern.ch/event/525142/contributions/2173709/attachments/1292787/1926290/Talk_PDF.pdf|talk by F. Bernlocher]] on HFXS at Reinterpretation Forum meeting June 2016. | ||
| === ATLAS and CMS results === | === ATLAS and CMS results === | ||
| | ^ gamma-gamma ^ ZZ*->4l ^ WW*->2l2nu ^ | | ^ gamma-gamma ^ ZZ*->4l ^ WW*->2l2nu ^ | ||
| - | ^ 8 TeV | [[https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2013-10/|ATLAS-HIGG-2013-10]] | [[https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2013-22/|ATLAS-HIGG-2013-22]] | | | + | ^ 8 TeV | [[https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2013-10/|ATLAS-HIGG-2013-10]] | [[https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2013-22/|ATLAS-HIGG-2013-22]] | [[https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2015-04/|HIGG-2015-04]] | |
| - | | | [[http://cms-results.web.cern.ch/cms-results/public-results/publications/HIG-14-016/index.html|CMS-HIG-14-016]] | [[http://cms-results.web.cern.ch/cms-results/public-results/preliminary-results/CMS-HIG-14-028/index.html|CMS-HIG-14-028]] | | | + | | | [[http://cms-results.web.cern.ch/cms-results/public-results/publications/HIG-14-016/index.html|CMS-HIG-14-016]] | [[http://cms-results.web.cern.ch/cms-results/public-results/publications/CMS-HIG-14-028/index.html|CMS-HIG-14-028]] | [[http://cms-results.web.cern.ch/cms-results/public-results/publications/CMS-HIG-15-010/index.html|CMS-HIG-15-010]] | |
| ^ 13 TeV | [[https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2016-067/|ATLAS-CONF-2016-067]] | [[https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2017-032|ATLAS-CONF-2017-032]] | | | ^ 13 TeV | [[https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2016-067/|ATLAS-CONF-2016-067]] | [[https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2017-032|ATLAS-CONF-2017-032]] | | | ||
| | | [[http://cms-results.web.cern.ch/cms-results/public-results/preliminary-results/HIG-17-015/index.html|CMS-HIG-17-015]] | | | | | [[http://cms-results.web.cern.ch/cms-results/public-results/preliminary-results/HIG-17-015/index.html|CMS-HIG-17-015]] | | | ||
| - | See also this [[https://indico.cern.ch/event/525142/contributions/2173709/attachments/1292787/1926290/Talk_PDF.pdf|talk by F. Bernlocher]] on HFXS at Reinterpretation Forum meeting June 2016. | ||
| === Concrete project proposals === | === Concrete project proposals === | ||
| Line 34: | Line 35: | ||
| - 'Generic' study | - 'Generic' study | ||
| - Simulate signal for above mentioned scenarios, let Higgs decay to 2 photons or ZZ*, run through Rivet analysis (or your own implementation of the fiducial cuts) and put result on top of SM expectation for fiducial Xsection and differential distributions published by the collaboration. | - Simulate signal for above mentioned scenarios, let Higgs decay to 2 photons or ZZ*, run through Rivet analysis (or your own implementation of the fiducial cuts) and put result on top of SM expectation for fiducial Xsection and differential distributions published by the collaboration. | ||
| - | - For the cases with a visible effect, compute the chi^2. Beware, the various histograms are not statistically independent, one needs to determine the most sensitive bin from all histograms. | + | - For the cases with a visible effect, compute the chi^2. Beware, the various histograms are not statistically independent, one needs to determine the most sensitive bin from all histograms. In principle [[https://contur.hepforge.org|Contur]] does exactly this, but it assumes SM=data, so this needs to be extended by the actual SM prediction. |
| - | - Wouldn't it be instructive to quantitatively estimate the gain from a pure signal strength approach? | + | - Wouldn't it be instructive to quantitatively estimate the gain from a pure signal strength approach? |
| - 2HDM-spcific study: From a general scan of the 2HDM fitting all the Higgs constraints in the usual way (signal strengths, cross section limits on heavy Higgs production), take the points with largest cross sections for pp->A->Zh and see whether these would contribute in any significant way to the fiducial Higgs measurements. Best consider 2HDM Type I, as it allows for lighter A. The plots below show the cross sections for gg->A->Zh at 13 TeV in the quasi-alignment limit from [[https://arxiv.org/abs/1507.00933|1507.00933]]: | - 2HDM-spcific study: From a general scan of the 2HDM fitting all the Higgs constraints in the usual way (signal strengths, cross section limits on heavy Higgs production), take the points with largest cross sections for pp->A->Zh and see whether these would contribute in any significant way to the fiducial Higgs measurements. Best consider 2HDM Type I, as it allows for lighter A. The plots below show the cross sections for gg->A->Zh at 13 TeV in the quasi-alignment limit from [[https://arxiv.org/abs/1507.00933|1507.00933]]: | ||
| {{:2017:groups:higgs:ma_gga13_zh_tb_cv99_h_i_l2h.jpeg?direct&200|}}{{:2017:groups:higgs:ma_gga13_zh_tb_cv99_h_ii_l2h.jpeg?direct&200|}} | {{:2017:groups:higgs:ma_gga13_zh_tb_cv99_h_i_l2h.jpeg?direct&200|}}{{:2017:groups:higgs:ma_gga13_zh_tb_cv99_h_ii_l2h.jpeg?direct&200|}} | ||
| + | |||
| + | === Ongoing or planned activities === | ||
| + | |||
| + | * Benjamin and Fabio want to produce [[2017:groups:higgs:fxsnp:ufo|UFO file]] for 'weird Higgs production' modes | ||
| + | * Ursula is looking at Higgs production from sbottom decays, see [[2017:groups:higgs:fxsnp:susycascades|first results here]]. | ||
2017/groups/higgs/fxsnp.1498118530.txt.gz · Last modified: 2017/06/22 10:02 by sabine.kraml
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