Universal lepton universality violation in exclusive processes

Lin Dai, Chul Kim, Adam K. Leibovich

Research output: Contribution to journalArticlepeer-review


In high energy exclusive processes involving leptons, QED corrections can be sensitive to infrared scales like the lepton mass and the soft photon energy cut, resulting in large logarithms that need to be resummed to all order in Formula Presented. When considering the ratio of the exclusive processes between two different lepton flavors, the ratio Formula Presented can be expressed in terms of factorized functions in the decoupled leptonic sectors. While some of the functional terms cancel, there remain the large logarithms due to the lepton mass difference and the energy cut. This factorization process can be universally applied to the exclusive processes such as Formula Presented and Formula Presented, where the resummed result in the ratio gives significant deviations from the naive expectation from lepton universality.

Original languageEnglish
Article numberL031301
JournalPhysical Review D
Issue number3
StatePublished - 1 Feb 2022

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


Dive into the research topics of 'Universal lepton universality violation in exclusive processes'. Together they form a unique fingerprint.

Cite this