A new test for non-universality at proton colliders
| Popis: | The Standard Model (SM) is characterized by a well-defined pattern of couplings of the gauge bosons to the fermions. Any deviation from this description would correspond to a definitive hint for beyond SM physics. These deviations would manifest in terms of different yields for the final states in a direct search. In this letter, we develop a universal framework to extract the extent to which a direct search can probe these differences. Our strategy is effectively demonstrated for a heavy neutral $Z'$ decaying into a pair of electrons and muons with different branching fractions. We note the implications of the drastically different reconstructions (especially in the HL-LHC) on the computation of discovery significance as well as the extraction of non-universality. The potential of the current and future $pp$ colliders, quantifying the extent of the asymmetry (in yields) to which they are sensitive, is explored. While the HL-LHC phase offers an optimistic but a restricted picture, it naturally paves the way for the FCC-hh machine. The latter being sensitive not only to heavier masses but also to minor departures from universality in the couplings for the lighter masses. |
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| Jazyk: | English |
| Přístupová URL adresa: | https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::50684d1d0905c87206ed9fd0f76a3868 https://hal.archives-ouvertes.fr/hal-03129408 |
| Přírůstkové číslo: | edsair.dedup.wf.001..50684d1d0905c87206ed9fd0f76a3868 |
| Autor: | Conventi, F., D'Ambrosio, G., Iyer, A.M., Rossi, E. |
| Přispěvatelé: | Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), HEP, INSPIRE |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
p p: scattering
Z': coupling [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex] new physics Z' --> muon+ muon Z' --> electron positron FCC-hh Z': mass [PHYS.HPHE] Physics [physics]/High Energy Physics - Phenomenology [hep-ph] Z': branching ratio [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph] CERN LHC Coll: upgrade [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] Z': decay universality: violation coupling: universality |
| Popis: | The Standard Model (SM) is characterized by a well-defined pattern of couplings of the gauge bosons to the fermions. Any deviation from this description would correspond to a definitive hint for beyond SM physics. These deviations would manifest in terms of different yields for the final states in a direct search. In this letter, we develop a universal framework to extract the extent to which a direct search can probe these differences. Our strategy is effectively demonstrated for a heavy neutral $Z'$ decaying into a pair of electrons and muons with different branching fractions. We note the implications of the drastically different reconstructions (especially in the HL-LHC) on the computation of discovery significance as well as the extraction of non-universality. The potential of the current and future $pp$ colliders, quantifying the extent of the asymmetry (in yields) to which they are sensitive, is explored. While the HL-LHC phase offers an optimistic but a restricted picture, it naturally paves the way for the FCC-hh machine. The latter being sensitive not only to heavier masses but also to minor departures from universality in the couplings for the lighter masses. |
| Databáze: | OpenAIRE |
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