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First Evidence of the Decay B+ →π+e+e

  • R. Aaij
  • , A. S.W. Abdelmotteleb
  • , C. Abellan Beteta
  • , (LHCb Collaboration)

Research output: Contribution to Journal › Article › Academic › peer-review

Abstract

The first evidence for the decay B+→π+e+e- is reported using proton-proton collision data recorded by the LHCb experiment at center-of-mass energies of 7, 8, and 13 TeV, corresponding to an integrated luminosity of 9 fb-1. A signal excess with a significance of 3.2σ is observed and the branching fraction is measured to be B(B+→π+e+e-)=(2.4-0.8+0.9 -0.2+0.4)×10-8, where the first set of uncertainties is statistical and the second is systematic. The result is consistent with the Standard Model expectation.

Original languageEnglish
Article number071804
Pages (from-to)1-13
Number of pages13
JournalPhysical review letters
Volume137
Issue number7
DOIs
Publication statusE-pub ahead of print - 14 Aug 2026

Bibliographical note

Publisher Copyright:
© 2026 CERN.

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