Probing new physics by comparing solar and KamLAND data

2004/06/30 by André de Gouvêa, Andre de Gouvea, C. Peña‐Garay +1 · 1 citation
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #Mixing (physics) #Neutrino #Neutrino Physics Research #Neutrino oscillation #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Physics beyond the Standard Model #Quantum mechanics #Solar neutrino #hep-ph

paper · pdf · doi:10.1103/physrevd.71.093002

published as Phys.Rev.D71:093002,2005 · Reference added

arxiv created 2004/07/20 · openalex publication_date 2005/05/06 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We explore whether KamLAND and solar data may end up inconsistent when analyzed in terms of neutrino oscillations. If this turned out to be the case, one would be led to conclude that there is more new physics, besides neutrino masses and mixing, in the leptonic sector. On the other hand, given that KamLAND and solar data currently agree when analyzed in terms of two-flavor neutrino oscillations, one is able to place nontrivial bounds on several manifestations of new physics. In particular, we compute how well a combined KamLAND and solar data analysis is able to constrain a specific form of violation of CPT invariance by placing a very stringent upper bound on |\ensuremathΔm²\ensuremath-\ensuremathΔm²|<1.1\ifmmode×\else\texttimes\fi10^\ensuremath-4 eV² at the three sigma confidence level (m refers to neutrinos, m to antineutrinos). We also estimate upper bounds on sin²\ensuremathθ\ensuremath-sin²\ensuremathθ. These are quite poor due to the fact that matter effects are almost irrelevant at KamLAND, which leads to an intrinsic inability to distinguish whether the antineutrino mixing angle is on the light (\ensuremathθ<\ensuremathπ/4) or dark side of the parameter space (\ensuremathθ>\ensuremathπ/4). We briefly discuss whether this ambiguity can be resolved by future long-baseline \ensuremathν_e\ensuremath↔\ensuremathν_e,\ensuremathμ searches.

Citations

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Cited by

• One-loop renormalization of pure Yang-Mills theory with Lorentz violation