Generalized Matter Parities from Finite Modular Symmetries

Abstract

We classify a supersymmetric extension of the Standard Model by discrete symmetries originating from finite modular symmetries ${\Gamma }_N$. Since all the couplings in supersymmetric theories of finite modular symmetries ${\Gamma }_N$ are described by holomorphic modular forms with even modular weights, renormalizable and non-renormalizable operators such as baryon- and/or lepton-number violating operators are severely constrained. From the modular transformation of matter multiplets with modular weight $1/M$, we find ${\mathbb{Z}}_{2M}$ symmetries, including the generalized baryon and lepton parities, $R$-parity, ${\mathbb{Z}}_3$ baryon triality and ${\mathbb{Z}}_6$ proton hexality. Such ${\mathbb{Z}}_{2M}$ symmetries are enlarged to ${\mathbb{Z}}_{2M}⋊{\mathbb{Z}}_2^{\text{CP}}$ symmetries together with the CP transformation.

arXiv comment23 pagess, v2: published version

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