2019:groups:higgs:higgseft
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2019:groups:higgs:higgseft [2019/06/13 11:47] ana_rosario.cueto_gomez |
2019:groups:higgs:higgseft [2019/06/19 11:36] ana_rosario.cueto_gomez |
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| **Project Description** | **Project Description** | ||
| - | A preliminar set of topics that can be discussed are: | + | -> Comparisons of SMEFTsim and SMEFTatNLO running both at LO to check the consistency |
| + | Especially for ttH and ZH-> the operators affecting these production channels will appear in ggZH. | ||
| + | The definition of operators in the NLO model can be found in http://feynrules.irmp.ucl.ac.be/attachment/wiki/SMEFTatNLO/definitions.pdf and in page 49 of https://arxiv.org/pdf/1709.06492.pdf for the LO model. | ||
| + | Main difference in the implementation is for complex operators, in SMEFT LO there is a phase and an absolute value whereas only one real value can be modified in the NLO model. | ||
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| + | -> Study of ggH and ggZH at NLO. Similar studies published: | ||
| + | https://arxiv.org/pdf/1601.08193.pdf (ggZH, limited set of operators studied) | ||
| + | https://arxiv.org/pdf/1708.00460.pdf (ggH) | ||
| + | For the generation of the interference term we need to interfere tree level (from the EFT) with loop-induced processes (from the SM). Madgraph is not able to do it for the official versions, but some documentation on how to do it has been gathered: | ||
| + | https://cp3.irmp.ucl.ac.be/projects/madgraph/wiki/LoopInducedTimesTree | ||
| + | It can be also done using the reweighting module. | ||
| + | Link to the STXT Rivet routine: https://gitlab.cern.ch/LHCHIGGSXS/LHCHXSWG2/STXS/Classification | ||
| + | that also provides histograms of common kinematic variables. | ||
| - | -> How does the inclusion of ggZH at NLO affects the parametrization of the STXS bins in terms of EFT parameters? | ||
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| - | -> Effects of the final state selection requirements | ||
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| - | -> Which is the best strategy to select the parameters that a measurement can constrain? There are typically large correlations between EFT coefficients, would combination of "independent" set ofparameters difficult the interpretation of the constraints? | ||
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| - | -> Compare sigma_EFT,LO/sigma_SM,LO vs. sigma_EFT_NLO/sigma_SM,NLO | ||
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| - | A discussion will take place on Thursday at 10:00 in the library | ||
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| - | Discussion to continue on Mondoy morning. | ||
| **Interested Participants** | **Interested Participants** | ||
| - | María Moreno Llacer | + | María Moreno Llacer, Marco Delmastro, Ana Cueto, Nicolas Berger, Paolo Francavilla, Saskia Falke, Daniel de Florian, Mauro Donega, Josh McFayden, Add your name :) |
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| - | Marco Delmastro | + | |
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| - | Ana Cueto | + | |
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| - | Nicolas Berger | + | |
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| - | Paolo Francavilla | + | |
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| - | Saskia Falke | + | |
| - | + | ||
| - | Add your name :) | + | |
2019/groups/higgs/higgseft.txt · Last modified: 2019/06/19 11:40 by ana_rosario.cueto_gomez
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