Description
Lorentz invariance is a fundamental symmetry of spacetime underpinning the Standard Model (SM) and our understanding of high-energy phenomena in particle physics. However, beyond the quantum gravity scale, we expect the SM to be replaced with a more fundamental, covariant theory giving a quantum description of gravity. The effective theory arising from this theory can break Lorentz invariance and thus predicts observables that exhibit low-energy manifestations of Lorentz violation. In particular, these observables could be a subleading contribution to neutrino oscillations and could therefore explain anomalous flavor measurements. The Standard Model Extension (SME) formalism describing such an effective theory predicts terms whose characteristic oscillation length becomes significant at atmospheric neutrino energies accessible by the IceCube Neutrino Observatory. Past measurements provide the most stringent bounds on Lorentz-violating operators in the SME. We extend these analyses using ten years of starting and through-going events along with a new energy reconstruction to study $\nu_{\mu}$ disappearance in the atmospheric neutrino spectrum at IceCube. In this talk, I will present IceCube's current statistical and systematic sensitivities to various dimensions of Lorentz-violating operators in the SME.
| Collaboration | IceCube Collaboration |
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