Renormalization Group Evolution of the Non-Unitary operator

Abstract

Integrating out a heavy field gives rise to effective Lagrangian containing higher dimensional operators. In the context of Type-I seesaw mechanism, integrating out the heavy right handed neutrino field leads to unique dimension five operator which gives the tree level neutrino mass term. Apart from these there are dimension six operators that can have important implications. A linear combination of two such operators gives rise to the non-unitarity in the lepton mixing matrix, $U_{\text{PMNS}}$. In this paper, we discuss the origin of non-unitarity at the high scale and its evolution through renormalization group running.

14 pages, Typos corrected

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• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Right-Handed Neutrinos at LHC and the Mechanism of Neutrino Mass Generation
• Low energy effects of neutrino masses
• Unitarity of the Leptonic Mixing Matrix
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• CP-violation from non-unitary leptonic mixing
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Cited by in corpus (4)

• Renormalization Group Evolution of the Standard Model Dimension Six Operators II: Yukawa Dependence
• Naturalness, Vacuum Stability and Leptogenesis in the Minimal Seesaw Model
• Looking for hints of a reconstructible seesaw model at the Large Hadron Collider
• CP violation in bipair neutrino mixing