Abstract
We study rare four-body decays of the Z-boson involving at least one neutrino and one charged lepton. Large destructive interferences make these decays very sensitive to the Z couplings to neutrinos. As the identified charged leptons can determine the neutrino flavors, these decays probe the universality of the Z couplings to neutrinos. The rare four-body processes could be accurately measured at future lepton colliders, leading to percent level precision.
| Original language | English |
|---|---|
| Journal | Physical Review D |
| Volume | 93 |
| Issue number | 9 |
| DOIs | |
| State | Published - 9 May 2016 |
| Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2016 American Physical Society.
Funding
We thank Jakub Scholtz for useful discussions. E.K. thanks Josh Ruderman for initial discussion on this project. The work of G.D. was supported in part by the FNRS, Belgium and by the Belgian American Education Foundation, USA. The work of Y.G. and E.K. is supported in part by the U.S. National Science Foundation through Grant No.PHY-1316222 and by a grant from the BSF. M.K. is supported by the DFG Graduate School Symmetry Breaking in Fundamental Interactions (GRK 1581) and is particularly grateful for having had the opportunity to engage in this collaboration, enabled by the European Research Council (ERC) under the Advanced Grant EFT4LHC. S.R. would like to thank the Department of Science and Technology (DST), Government of India for supporting the visit through the INSA-INSPIRE Faculty Fellowship.
| Funders | Funder number |
|---|---|
| Belgian American Education Foundation | |
| INSA-INSPIRE | |
| National Science Foundation | |
| Directorate for Mathematical and Physical Sciences | 1316222 |
| Bloom's Syndrome Foundation | |
| Seventh Framework Programme | 291144 |
| European Commission | EFT4LHC |
| Deutsche Forschungsgemeinschaft | GRK 1581 |
| Fonds De La Recherche Scientifique - FNRS | |
| Department of Science and Technology, Government of Kerala |