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Author  |
Crivelli, P.; Hernandez-Garcia, J.; Lopez-Pavon, J.; Martin Lozano, V.; Molina Bueno, L. |
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Title |
First bounds on effective muon interactions using the NA64μ experiment at CERN |
Type |
Journal Article |
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Year |
2026 |
Publication |
Journal of High Energy Physics |
Abbreviated Journal |
J. High Energy Phys. |
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Volume |
07 |
Issue |
7 |
Pages |
031 - 18pp |
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Keywords |
Neutrino Interactions; SMEFT; Sterile or Heavy Neutrinos |
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Abstract |
We analyze how NA64 μcan contribute to the global SMEFT program demonstrating that it can probe two effective four-lepton operators completely unbounded so far and break one of the current flat directions. Furthermore, we also study an extension of SMEFT that includes fermion singlets of the SM gauge group in the low energy field content. This effective field theory, usually dubbed nu SMEFT, is well motivated by the observation of light neutrino masses and leptonic mixing. We find that NA64 μcan constrain three unbounded four-fermion operators of the nu SMEFT. We derive the current bounds on these operators and compute the future sensitivity. |
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Address |
[Crivelli, Paolo] Swiss Fed Inst Technol, Inst Particle Phys & Astrophys, CH-8093 Zurich, Switzerland, Email: paolo.crivelli@cern.ch; |
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Publisher |
Springer |
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Language |
English |
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Notes |
WOS:001810552700004 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
7317 |
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