Constraints of the fourth generation from $g_μ-2$

Abstract

We investigate the newly observed muon $g_μ-2$ anomaly in the framework of a sequential fourth generation model with a heavy fourth neutrino, $ν'$. We find that $g_μ-2$ can exclude most values of $m_{ν'}$ and put a very stringent constraint on the existence of the fourth generation. We also obtain bounds of a $4\times 4$ leptonic mixing matrix elements, $V_{2ν'}$ if it really exists.