New physics at Tera-Z: precision renormalised
Abstract We study the power of a Tera-Z run at FCC-ee for indirectly detecting or constraining heavy new physics. Our main finding is that nearly every new particle which matches at tree level to dimension-six operators of the Standard Model Effective Field Theory (SMEFT) affects electroweak precisi...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2025-02-01
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| Series: | Journal of High Energy Physics |
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| Online Access: | https://doi.org/10.1007/JHEP02(2025)164 |
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| author | Lukas Allwicher Matthew McCullough Sophie Renner |
| author_facet | Lukas Allwicher Matthew McCullough Sophie Renner |
| author_sort | Lukas Allwicher |
| collection | DOAJ |
| description | Abstract We study the power of a Tera-Z run at FCC-ee for indirectly detecting or constraining heavy new physics. Our main finding is that nearly every new particle which matches at tree level to dimension-six operators of the Standard Model Effective Field Theory (SMEFT) affects electroweak precision observables (EWPOs) at either tree level or via one loop renormalisation group (RG) running. This is true almost regardless of the structure of couplings to the Standard Model; just a handful of exceptions are identified which can produce zeroes in the EWPO RG equations. Under simple flavour assumptions, we perform fits of each state to projected FCC-ee Z pole measurements, showing that all scenarios can be tested at the TeV scale or better, with many projected exclusions reaching tens of TeV. Tera-Z is argued to provide an almost inescapable probe of heavy new physics. |
| format | Article |
| id | doaj-art-ace1004b60c3487ab7dc21877f17ca07 |
| institution | DOAJ |
| issn | 1029-8479 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj-art-ace1004b60c3487ab7dc21877f17ca072025-08-20T03:03:57ZengSpringerOpenJournal of High Energy Physics1029-84792025-02-012025212610.1007/JHEP02(2025)164New physics at Tera-Z: precision renormalisedLukas Allwicher0Matthew McCullough1Sophie Renner2Physik-Institut, Universität ZürichTheoretical Physics Department, CERNSchool of Physics and Astronomy, University of GlasgowAbstract We study the power of a Tera-Z run at FCC-ee for indirectly detecting or constraining heavy new physics. Our main finding is that nearly every new particle which matches at tree level to dimension-six operators of the Standard Model Effective Field Theory (SMEFT) affects electroweak precision observables (EWPOs) at either tree level or via one loop renormalisation group (RG) running. This is true almost regardless of the structure of couplings to the Standard Model; just a handful of exceptions are identified which can produce zeroes in the EWPO RG equations. Under simple flavour assumptions, we perform fits of each state to projected FCC-ee Z pole measurements, showing that all scenarios can be tested at the TeV scale or better, with many projected exclusions reaching tens of TeV. Tera-Z is argued to provide an almost inescapable probe of heavy new physics.https://doi.org/10.1007/JHEP02(2025)164Effective Field TheoriesElectroweak Precision PhysicsFlavour SymmetriesSpecific BSM Phenomenology |
| spellingShingle | Lukas Allwicher Matthew McCullough Sophie Renner New physics at Tera-Z: precision renormalised Journal of High Energy Physics Effective Field Theories Electroweak Precision Physics Flavour Symmetries Specific BSM Phenomenology |
| title | New physics at Tera-Z: precision renormalised |
| title_full | New physics at Tera-Z: precision renormalised |
| title_fullStr | New physics at Tera-Z: precision renormalised |
| title_full_unstemmed | New physics at Tera-Z: precision renormalised |
| title_short | New physics at Tera-Z: precision renormalised |
| title_sort | new physics at tera z precision renormalised |
| topic | Effective Field Theories Electroweak Precision Physics Flavour Symmetries Specific BSM Phenomenology |
| url | https://doi.org/10.1007/JHEP02(2025)164 |
| work_keys_str_mv | AT lukasallwicher newphysicsatterazprecisionrenormalised AT matthewmccullough newphysicsatterazprecisionrenormalised AT sophierenner newphysicsatterazprecisionrenormalised |