2017:groups:higgs:lhsmeftroadmap
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2017:groups:higgs:lhsmeftroadmap [2017/06/22 19:15] fabio.maltoni |
2017:groups:higgs:lhsmeftroadmap [2017/06/29 14:29] (current) kristin.lohwasser |
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| ====== Staged approach towards constraining the SMEFT at the LHC ====== | ====== Staged approach towards constraining the SMEFT at the LHC ====== | ||
| - | Interested people: Fabio Maltoni,... | + | Interested people: Fabio Maltoni, Kristin Lohwasser... |
| - | **Motivation:** Fiducial cross section measurements and STXS in Higgs physics are being developed and will provide non-maximally sensitive input to global SMEFT fits. Direct experimental top-down SMEFT interpretations of LHC SM measurements in Higgs and top physics have not yet taken off, due mostly to a difficulty of handling the richness of possible theoretical approaches together with many technical complications. | + | **Motivation:** Fiducial cross section measurements and STXS in Higgs physics are being developed and will provide non-maximally sensitive input to global SMEFT fits. Direct experimental top-down SMEFT interpretations of LHC SM measurements in Higgs and top physics have not yet taken off, due mostly to a difficulty of handling the richness and diversity of the many theoretical approaches together with the intrinsic technical complications. |
| - | **Aim:** Stimulate the implementation and development of SMEFT measurements at the LHC by devising a multi-staged approach. | + | **Aim** : Stimulate the implementation and development of SMEFT measurements at the LHC by devising a multi-staged approach. |
| - | ** Stage 1 (proposal)**: Provide the strongest (even MVA based) constrains from (one or more) processes/observables on one operator at the time. | + | ** Stage 1 (proposal)** : Provide the strongest (even MVA based) constrains from (one or more) processes/observables on one operator at the time. |
| - | ** Some advantages: ** | + | ** Some advantages ** : |
| - A necessary step before achieving a global fit | - A necessary step before achieving a global fit | ||
| - | - Way easier than a global and feasible today | + | - Way easier than a global fit and feasible today |
| - Scales (less than) linearly with the number of operators | - Scales (less than) linearly with the number of operators | ||
| - Basis agnostic (any operator can be added to the list) | - Basis agnostic (any operator can be added to the list) | ||
| - Provides reference information to fits based on model independent bottom up approaches (fiducial or simplified XS) | - Provides reference information to fits based on model independent bottom up approaches (fiducial or simplified XS) | ||
| - | - Educational purposes, i.e. learning about how each operator behaves, | + | - Educational purposes, i.e. learning about how each operator behaves |
| - Provides benchmarking of sensitivities between different analyses and/or different experiments | - Provides benchmarking of sensitivities between different analyses and/or different experiments | ||
| - It offers a simple way to quantify the loss of sensitivity of STXS or FXS with respect to a top-down approach | - It offers a simple way to quantify the loss of sensitivity of STXS or FXS with respect to a top-down approach | ||
| - Known issues such as interference vs squared dominance, validity studies, and others can be easily studied | - Known issues such as interference vs squared dominance, validity studies, and others can be easily studied | ||
| - It can be automatised at the analysis level (basically one or few types of analysis really necessary) | - It can be automatised at the analysis level (basically one or few types of analysis really necessary) | ||
| - | - Other? | + | - Other? Please add here... |
| - | ** Drawbacks/Limitations: ** | + | **Drawbacks/Limitations** : |
| - Results are not constraints on the coefficients and therefore should not be used as such. | - Results are not constraints on the coefficients and therefore should not be used as such. | ||
| - | - Other? | + | - Other? Please add here... |
| + | |||
| + | ** Les Houches Project** : | ||
| - | ** Les Houches Project: ** | ||
| - Provide comprehensive list of operators (with simple normalisation) and implementation | - Provide comprehensive list of operators (with simple normalisation) and implementation | ||
| - Provide minimal list of recommendations (sanity checks, int vs square treatments, perturbative orders, EFT validity,…) | - Provide minimal list of recommendations (sanity checks, int vs square treatments, perturbative orders, EFT validity,…) | ||
| - Fully Work out a few examples in Higgs, Top and EW physics. | - Fully Work out a few examples in Higgs, Top and EW physics. | ||
| + | - More? | ||
| - | ** Examples of LHC analyses following the SMEFT-one-operator-at-the-time approach | + | ** Examples of LHC analyses following the SMEFT-one-operator-at-the-time approach ** |
| - [[http://cms-results.web.cern.ch/cms-results/public-results/preliminary-results/TOP-17-005/index.html|CMS SM measurement of ttW and ttZ]] | - [[http://cms-results.web.cern.ch/cms-results/public-results/preliminary-results/TOP-17-005/index.html|CMS SM measurement of ttW and ttZ]] | ||
2017/groups/higgs/lhsmeftroadmap.1498151731.txt.gz · Last modified: 2017/06/22 19:15 by fabio.maltoni
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