Lepton universality violation by Kaluza-Klein neutrinos in b → sll transition

Janus Capellan Aban, Chuan Ren Chen*, Chrisna Setyo Nugroho

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Recent measure of RK, involving the decays of b→sl+l, by the LHCb at CERN strengthened the deviation from the Standard Model prediction. The best fit in the updated global analysis suggests that the muon specific Wilson coefficients C9bsμμ=−C10bsμμ should be about −0.41. In this paper, we show that the accumulate effects of KK modes of a singlet Dirac neutrino propagating in the large extra-dimensional space naturally provide C9bsll=−C10bsll to explain the anomaly. By taking the muon Yukawa coupling to be about 5, the fundamental scale in the extra-dimensional framework should be lowered down to about 20 TeV if there are two additional spatial dimensions.

Original languageEnglish
Article number137164
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Publication statusPublished - 2022 Jul 10

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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