2016/01/31 by Yu Muramatsu, Takaaki Nomura, Yusuke Shimizu · 11 citations
Computer Science · Physics and Astronomy · #Branching fraction #Computational Physics and Python Applications #Lepton #Limit (mathematics) #Neutrino #Neutrino Physics Research #Particle physics theoretical and experimental studies #Superpartner #Supersymmetry #Symmetry (geometry) #Yukawa potential #hep-ex #hep-ph
paper · pdf · doi:10.1007/jhep03(2016)192
published in Journal of High Energy Physics 2016(3) (Springer Nature) · 14 pages, final version
openalex publication_date 2016/03/01 · arxiv created 2016/04/26 · arxiv updated 2016/04/27 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We present a modified Altarelli and Feruglio A 4 model where an additional A 4 singlet-prime flavon is introduced. In this model, non-zero θ 13 is given by this additional A 4 singlet-prime flavon which breaks tri-bimaximal mixing. In the framework of the supersymmetry with U(1) R symmetry, we obtain vacuum expectation values (VEVs) and VEV alignments of flavons through driving fields. It is considered that flavon induces distinctive flavor violating process if flavon mass is light. Assuming mass of SUSY particles are sufficiently heavy so that the SUSY contributions can be negligible, we discuss the flavor violating Yukawa interaction through flavon exchange in the charged lepton sector. According to the potential analysis, the VEV of flavon breaks A 4 down to Z 3 in the charged lepton sector and relation among flavon masses is determined. Thanks for the residual Z 3 symmetry, many lepton flavor violating decay modes are forbidden except for τ → μμē and τ → eeμ . A mass limit of the flavon from these three-body decay modes is 60 GeV taking into account the current experimental lower bounds at the Belle experiment. In our model, we predict a ratio of the branching ratios τ → μμē and τ → eeμ by using known charged lepton masses. We also find that the production cross section for the flavon can be O(1) fb. Thus the flavon would be found at the LHC run 2 by searching for 4-tau lepton signal.