On the future of Higgs, electroweak and diboson measurements at lepton colliders
| Popis: | LEP precision on electroweak measurements was sufficient not to hamper the extraction of Higgs couplings at the LHC. But the foreseen permille-level Higgs measurements at future lepton colliders might suffer from parametric electroweak uncertainties in the absence of a dedicated electroweak program. We perform a joint, complete and consistent effective-field-theory analysis of Higgs and electroweak processes. The full electroweak-sector dependence of the $e^+e^- \to WW$ production process is notably accounted for, using statistically optimal observables. Up-to-date HL-LHC projections are combined with CEPC, FCC-ee, ILC and CLIC ones. For circular colliders, our results demonstrate the importance of a new $Z$-pole program for the robust extraction of Higgs couplings. At linear colliders, we show how exploiting multiple polarizations and centre-of-mass energies is crucial to mitigate contaminations from electroweak parameter uncertainties on the Higgs physics program. We also investigate the potential of alternative electroweak measurements to compensate for the lack of direct $Z$-pole run, considering for instance radiative return to these energies. Conversely, we find that Higgs measurements at linear colliders could improve our knowledge of the $Z$ couplings to electrons. Comment: 49 pages, 13 figures and 8 tables |
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| DOI: | 10.48550/arxiv.1907.04311 |
| DOI: | 10.3204/PUBDB-2019-02901 |
| DOI: | 10.1007/JHEP12(2019)117 |
| Přístupová URL adresa: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8a836fccfc86471774386f13f418523e |
| Rights: | OPEN |
| Přírůstkové číslo: | edsair.doi.dedup.....8a836fccfc86471774386f13f418523e |
| Autor: | Christophe Grojean, Ayan Paul, Gauthier Durieux, Jorge de Blas, Jiayin Gu |
| Rok vydání: | 2019 |
| Předmět: |
Nuclear and High Energy Physics
Particle physics Higgs Physics coupling [Higgs particle] standard model FOS: Physical sciences electron positron --> W+ W 01 natural sciences Measure (mathematics) ILC Coll scattering [electron positron] Standard Model High Energy Physics - Experiment High Energy Physics - Experiment (hep-ex) effective field theory High Energy Physics - Phenomenology (hep-ph) CERN CLIC 0103 physical sciences coupling [Z0] precision measurement [electroweak interaction] Effective field theory lcsh:Nuclear and particle physics. Atomic energy. Radioactivity ddc:530 010306 general physics Physics Large Hadron Collider 010308 nuclear & particles physics Computer Science::Information Retrieval pole [Z0] Electroweak interaction High Energy Physics::Phenomenology Effective Field Theories Observable FCC-ee CEPC High Energy Physics - Phenomenology pair production [W] Beyond Standard Model Higgs boson lcsh:QC770-798 High Energy Physics::Experiment linear collider [electron positron] Higgs [coupling] Lepton |
| Zdroj: | Journal of high energy physics 2019(12), 117 (2019). doi:10.1007/JHEP12(2019)117 Journal of High Energy Physics Journal of High Energy Physics, Vol 2019, Iss 12, Pp 1-50 (2019) |
| DOI: | 10.48550/arxiv.1907.04311 |
| Popis: | LEP precision on electroweak measurements was sufficient not to hamper the extraction of Higgs couplings at the LHC. But the foreseen permille-level Higgs measurements at future lepton colliders might suffer from parametric electroweak uncertainties in the absence of a dedicated electroweak program. We perform a joint, complete and consistent effective-field-theory analysis of Higgs and electroweak processes. The full electroweak-sector dependence of the $e^+e^- \to WW$ production process is notably accounted for, using statistically optimal observables. Up-to-date HL-LHC projections are combined with CEPC, FCC-ee, ILC and CLIC ones. For circular colliders, our results demonstrate the importance of a new $Z$-pole program for the robust extraction of Higgs couplings. At linear colliders, we show how exploiting multiple polarizations and centre-of-mass energies is crucial to mitigate contaminations from electroweak parameter uncertainties on the Higgs physics program. We also investigate the potential of alternative electroweak measurements to compensate for the lack of direct $Z$-pole run, considering for instance radiative return to these energies. Conversely, we find that Higgs measurements at linear colliders could improve our knowledge of the $Z$ couplings to electrons. Comment: 49 pages, 13 figures and 8 tables |
| Databáze: | OpenAIRE |
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