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Setting limits on Effective Field Theories: the case of Dark Matter

The usage of Effective Field Theories (EFT) for LHC new physics searches is receiving increasing attention. It is thus important to clarify all the aspects related with the applicability of the EFT formalism in the LHC environment, where the large available energy can produce reactions that overcome...

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Detalles Bibliográficos
Autores principales: Pobbe, F., Wulzer, A., Zanetti, M.
Lenguaje:eng
Publicado: 2017
Materias:
Acceso en línea:https://dx.doi.org/10.1007/JHEP08(2017)074
http://cds.cern.ch/record/2261619
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author Pobbe, F.
Wulzer, A.
Zanetti, M.
author_facet Pobbe, F.
Wulzer, A.
Zanetti, M.
author_sort Pobbe, F.
collection CERN
description The usage of Effective Field Theories (EFT) for LHC new physics searches is receiving increasing attention. It is thus important to clarify all the aspects related with the applicability of the EFT formalism in the LHC environment, where the large available energy can produce reactions that overcome the maximal range of validity, i.e. the cutoff, of the theory. We show that this does not forbid to set rigorous limits on the EFT parameter space through a modified version of the ordinary binned likelihood hypothesis test, which we design and validate. Our limit-setting strategy can be carried on in its full-fledged form by the LHC experimental collaborations, or performed externally to the collaborations, through the Simplified Likelihood approach, by relying on certain approximations. We apply it to the recent CMS mono-jet analysis and derive limits on a Dark Matter (DM) EFT model. DM is selected as a case study because the limited reach on the DM production EFT Wilson coefficient and the structure of the theory suggests that the cutoff might be dangerously low, well within the LHC reach. However our strategy can also be applied, if needed, to EFT’s parametrising the indirect effects of heavy new physics in the Electroweak and Higgs sectors.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2017
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spelling cern-22616192023-08-19T02:52:56Zdoi:10.1007/JHEP08(2017)074http://cds.cern.ch/record/2261619engPobbe, F.Wulzer, A.Zanetti, M.Setting limits on Effective Field Theories: the case of Dark Matterhep-exParticle Physics - Experimenthep-phParticle Physics - PhenomenologyThe usage of Effective Field Theories (EFT) for LHC new physics searches is receiving increasing attention. It is thus important to clarify all the aspects related with the applicability of the EFT formalism in the LHC environment, where the large available energy can produce reactions that overcome the maximal range of validity, i.e. the cutoff, of the theory. We show that this does not forbid to set rigorous limits on the EFT parameter space through a modified version of the ordinary binned likelihood hypothesis test, which we design and validate. Our limit-setting strategy can be carried on in its full-fledged form by the LHC experimental collaborations, or performed externally to the collaborations, through the Simplified Likelihood approach, by relying on certain approximations. We apply it to the recent CMS mono-jet analysis and derive limits on a Dark Matter (DM) EFT model. DM is selected as a case study because the limited reach on the DM production EFT Wilson coefficient and the structure of the theory suggests that the cutoff might be dangerously low, well within the LHC reach. However our strategy can also be applied, if needed, to EFT’s parametrising the indirect effects of heavy new physics in the Electroweak and Higgs sectors.The usage of Effective Field Theories (EFT) for LHC new physics searches is receiving increasing attention. It is thus important to clarify all the aspects related with the applicability of the EFT formalism in the LHC environment, where the large available energy can produce reactions that overcome the maximal range of validity, i.e. the cutoff, of the theory. We show that this does forbid to set rigorous limits on the EFT parameter space through a modified version of the ordinary binned likelihood hypothesis test, which we design and validate. Our limit-setting strategy can be carried on in its full-fledged form by the LHC experimental collaborations, or performed externally to the collaborations, through the Simplified Likelihood approach, by relying on certain approximations. We apply it to the recent CMS mono-jet analysis and derive limits on a Dark Matter (DM) EFT model. DM is selected as a case study because the limited reach on the DM production EFT Wilson coefficient and the structure of the theory suggests that the cutoff might be dangerously low, well within the LHC reach. However our strategy can also be applied to EFT's parametrising the indirect effects of heavy new physics in the Electroweak and Higgs sectors.arXiv:1704.00736CERN-TH-2017-074oai:cds.cern.ch:22616192017-04-03
spellingShingle hep-ex
Particle Physics - Experiment
hep-ph
Particle Physics - Phenomenology
Pobbe, F.
Wulzer, A.
Zanetti, M.
Setting limits on Effective Field Theories: the case of Dark Matter
title Setting limits on Effective Field Theories: the case of Dark Matter
title_full Setting limits on Effective Field Theories: the case of Dark Matter
title_fullStr Setting limits on Effective Field Theories: the case of Dark Matter
title_full_unstemmed Setting limits on Effective Field Theories: the case of Dark Matter
title_short Setting limits on Effective Field Theories: the case of Dark Matter
title_sort setting limits on effective field theories: the case of dark matter
topic hep-ex
Particle Physics - Experiment
hep-ph
Particle Physics - Phenomenology
url https://dx.doi.org/10.1007/JHEP08(2017)074
http://cds.cern.ch/record/2261619
work_keys_str_mv AT pobbef settinglimitsoneffectivefieldtheoriesthecaseofdarkmatter
AT wulzera settinglimitsoneffectivefieldtheoriesthecaseofdarkmatter
AT zanettim settinglimitsoneffectivefieldtheoriesthecaseofdarkmatter