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One of the key assumptions of the Standard Model of fundamental particles isthat the interactions of the charged leptons, namely electrons, muons, andtaus, differ only because of their different masses. While precision testscomparing processes involving electrons and muons have not revealed anysignificant violation of this assumption, recent studies involving thehigher-mass tau lepton have resulted in observations that challenge leptonuniversality at the level of four standard deviations. A confirmation of theseresults would point to new particles or interactions, and could have profoundimplications for our understanding of particle physics.

A Challenge to Lepton Universality in B Meson Decays