Fourth Generation Leptons and Muon $g-2$

Details Fourth Generation Leptons and Muon $g-2$ Fourth Generation Leptons and Muon $g-2$

2008-11-29

arxiv.org/abs/0812.0064v2

Phys.Rev.D79:073002,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

Minor changes, with references updated

Scientific paper

10.1103/PhysRevD.79.073002

We consider the contributions to $g_\mu-2$ from fourth generation heavy neutral and charged leptons, $N$ and $E$, at the one-loop level. Diagrammatically, there are two types of contributions: boson-boson-$N$, and $E$-$E$-boson in the loop diagram. In general, the effect from $N$ is suppressed by off-diagonal lepton mixing matrix elements. For $E$, we consider flavor changing neutral couplings arising from various New Physics models, which are stringently constrained by $\mu\to e\gamma$. We assess how the existence of a fourth generation would affect these New Physics models.

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