Anatomy of the Higgs fits: A first guide to statistical treatments of the theoretical uncertainties
Autor(a) principal: | |
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Data de Publicação: | 2016 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1016/j.nuclphysb.2016.02.019 http://hdl.handle.net/11449/161377 |
Resumo: | The studies of the Higgs boson couplings based on the recent and upcoming LHC data open up a new window on physics beyond the Standard Model. In this paper, we propose a statistical guide to the consistent treatment of the theoretical uncertainties entering the Higgs rate fits. Both the Bayesian and frequentist approaches are systematically analysed in a unified formalism. We present analytical expressions for the marginal likelihoods, useful to implement simultaneously the experimental and theoretical uncertainties. We review the various origins of the theoretical errors (QCD, EFT, PDF, production mode contamination ...). All these individual uncertainties are thoroughly combined with the help of moment-based considerations. The theoretical correlations among Higgs detection channels appear to affect the location and size of the best-fit regions in the space of Higgs couplings. We discuss the recurrent question of the shape of the prior distributions for the individual theoretical errors and find that a nearly Gaussian prior arises from the error combinations. We also develop the bias approach, which is an alternative to marginalisation providing more conservative results. The statistical framework to apply the bias principle is introduced and two realisations of the bias are proposed. Finally, depending on the statistical treatment, the Standard Model prediction for the Higgs signal strengths is found to lie within either the 68% or 95% confidence level region obtained from the latest analyses of the 7 and 8 TeV LHC datasets. |
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Repositório Institucional da UNESP |
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Anatomy of the Higgs fits: A first guide to statistical treatments of the theoretical uncertaintiesThe studies of the Higgs boson couplings based on the recent and upcoming LHC data open up a new window on physics beyond the Standard Model. In this paper, we propose a statistical guide to the consistent treatment of the theoretical uncertainties entering the Higgs rate fits. Both the Bayesian and frequentist approaches are systematically analysed in a unified formalism. We present analytical expressions for the marginal likelihoods, useful to implement simultaneously the experimental and theoretical uncertainties. We review the various origins of the theoretical errors (QCD, EFT, PDF, production mode contamination ...). All these individual uncertainties are thoroughly combined with the help of moment-based considerations. The theoretical correlations among Higgs detection channels appear to affect the location and size of the best-fit regions in the space of Higgs couplings. We discuss the recurrent question of the shape of the prior distributions for the individual theoretical errors and find that a nearly Gaussian prior arises from the error combinations. We also develop the bias approach, which is an alternative to marginalisation providing more conservative results. The statistical framework to apply the bias principle is introduced and two realisations of the bias are proposed. Finally, depending on the statistical treatment, the Standard Model prediction for the Higgs signal strengths is found to lie within either the 68% or 95% confidence level region obtained from the latest analyses of the 7 and 8 TeV LHC datasets.Brazilian Ministry of Science, Technology and InnovationInstitut Universitaire de FranceEuropean ERC Grant Higgs@LHCEuropean Union FP7 ITN INVISIBLES (Marie Curie Actions)Sao Paulo State Univ, Inst Fis Teor, ICTP South Amer Inst Fundamental Res, Sao Paulo, BrazilUniv Fed Rio Grande do Norte, Int Inst Phys, Av Odilon Gomes Lima 1722, BR-59078400 Natal, RN, BrazilUniv Paris 11, CNRS, Phys Theor Lab, Bat 210, F-91405 Orsay, FranceSao Paulo State Univ, Inst Fis Teor, ICTP South Amer Inst Fundamental Res, Sao Paulo, BrazilEuropean Union FP7 ITN INVISIBLES (Marie Curie Actions): PITN-GA-2011-289442Elsevier B.V.Universidade Estadual Paulista (Unesp)Univ Fed Rio Grande do NorteUniv Paris 11Fichet, Sylvain [UNESP]Moreau, Gregory2018-11-26T16:32:30Z2018-11-26T16:32:30Z2016-04-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article391-446application/pdfhttp://dx.doi.org/10.1016/j.nuclphysb.2016.02.019Nuclear Physics B. Amsterdam: Elsevier Science Bv, v. 905, p. 391-446, 2016.0550-3213http://hdl.handle.net/11449/16137710.1016/j.nuclphysb.2016.02.019WOS:000373571400019WOS000373571400019.pdfWeb of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengNuclear Physics B1,744info:eu-repo/semantics/openAccess2024-01-13T06:35:30Zoai:repositorio.unesp.br:11449/161377Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T22:53:18.688180Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Anatomy of the Higgs fits: A first guide to statistical treatments of the theoretical uncertainties |
title |
Anatomy of the Higgs fits: A first guide to statistical treatments of the theoretical uncertainties |
spellingShingle |
Anatomy of the Higgs fits: A first guide to statistical treatments of the theoretical uncertainties Fichet, Sylvain [UNESP] |
title_short |
Anatomy of the Higgs fits: A first guide to statistical treatments of the theoretical uncertainties |
title_full |
Anatomy of the Higgs fits: A first guide to statistical treatments of the theoretical uncertainties |
title_fullStr |
Anatomy of the Higgs fits: A first guide to statistical treatments of the theoretical uncertainties |
title_full_unstemmed |
Anatomy of the Higgs fits: A first guide to statistical treatments of the theoretical uncertainties |
title_sort |
Anatomy of the Higgs fits: A first guide to statistical treatments of the theoretical uncertainties |
author |
Fichet, Sylvain [UNESP] |
author_facet |
Fichet, Sylvain [UNESP] Moreau, Gregory |
author_role |
author |
author2 |
Moreau, Gregory |
author2_role |
author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) Univ Fed Rio Grande do Norte Univ Paris 11 |
dc.contributor.author.fl_str_mv |
Fichet, Sylvain [UNESP] Moreau, Gregory |
description |
The studies of the Higgs boson couplings based on the recent and upcoming LHC data open up a new window on physics beyond the Standard Model. In this paper, we propose a statistical guide to the consistent treatment of the theoretical uncertainties entering the Higgs rate fits. Both the Bayesian and frequentist approaches are systematically analysed in a unified formalism. We present analytical expressions for the marginal likelihoods, useful to implement simultaneously the experimental and theoretical uncertainties. We review the various origins of the theoretical errors (QCD, EFT, PDF, production mode contamination ...). All these individual uncertainties are thoroughly combined with the help of moment-based considerations. The theoretical correlations among Higgs detection channels appear to affect the location and size of the best-fit regions in the space of Higgs couplings. We discuss the recurrent question of the shape of the prior distributions for the individual theoretical errors and find that a nearly Gaussian prior arises from the error combinations. We also develop the bias approach, which is an alternative to marginalisation providing more conservative results. The statistical framework to apply the bias principle is introduced and two realisations of the bias are proposed. Finally, depending on the statistical treatment, the Standard Model prediction for the Higgs signal strengths is found to lie within either the 68% or 95% confidence level region obtained from the latest analyses of the 7 and 8 TeV LHC datasets. |
publishDate |
2016 |
dc.date.none.fl_str_mv |
2016-04-01 2018-11-26T16:32:30Z 2018-11-26T16:32:30Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1016/j.nuclphysb.2016.02.019 Nuclear Physics B. Amsterdam: Elsevier Science Bv, v. 905, p. 391-446, 2016. 0550-3213 http://hdl.handle.net/11449/161377 10.1016/j.nuclphysb.2016.02.019 WOS:000373571400019 WOS000373571400019.pdf |
url |
http://dx.doi.org/10.1016/j.nuclphysb.2016.02.019 http://hdl.handle.net/11449/161377 |
identifier_str_mv |
Nuclear Physics B. Amsterdam: Elsevier Science Bv, v. 905, p. 391-446, 2016. 0550-3213 10.1016/j.nuclphysb.2016.02.019 WOS:000373571400019 WOS000373571400019.pdf |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Nuclear Physics B 1,744 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
391-446 application/pdf |
dc.publisher.none.fl_str_mv |
Elsevier B.V. |
publisher.none.fl_str_mv |
Elsevier B.V. |
dc.source.none.fl_str_mv |
Web of Science reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808129470294392832 |