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arXiv · 1512.03581

Reconciling $(g-2)_μ$ and charged lepton flavour violating processes through a doubly charged scalar

Joydeep Chakrabortty·Pradipta Ghosh·Subhadeep Mondal·Tripurari Srivastava
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Abstract

In this work, we investigate the phenomenological consequences of a doubly charged scalar which may belong to different uncoloured scalar multiplets. This doubly charged scalar couples to the charged leptons as well as gauge bosons, which we parametrize in a model independent way. Restricting ourselves in the regime of conserved charged-parity (CP), we assume only a few non-zero Yukawa couplings ($y_{μ\ell}$, where $\ell=e,μ,τ$) between the doubly charged scalar and the charged leptons. Our choices allow the doubly charged scalar to impinge low-energy processes like anomalous magnetic moment of muon and a few possible charged lepton flavour violating (CLFV) processes. These same Yukawa couplings are also instrumental in producing same-sign dilepton signatures at the LHC. In this article we examine the impact of individual contributions from the diagonal and off-diagonal Yukawa couplings in the light of muon $(g-2)$ excess. Subsequently, we use the derived information to inquire the possible CLFV processes and finally the collider signals from the decay of a doubly charged scalar. Our simplified analyses, depending on the mass of doubly charged scalar, provide a good estimate for the magnitude of the concerned Yukawa couplings. Our findings would appear resourceful to test the phenomenological significance of a doubly charged scalar by using complementary information from muon $(g-2)$, CLFV and the collider experiments.

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Joydeep Chakrabortty, Pradipta Ghosh, Subhadeep Mondal, Tripurari Srivastava. 2016-06-05. Reconciling $(g-2)_μ$ and charged lepton flavour violating processes through a doubly charged scalar. https://doi.org/10.1103/physrevd.93.115004

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