Search for B+ →k+τ+τ- at the BaBar Experiment

(BABAR Collaboration)

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67 Scopus citations


We search for the rare flavor-changing neutral current process B+→K+τ+τ- using data from the BABAR experiment. The data sample, collected at the center-of-mass energy of the (4S) resonance, corresponds to a total integrated luminosity of 424 fb-1 and to 471×106 BB pairs. We reconstruct one B meson, produced in the (4S)→B+B- decay, in one of many hadronic decay modes and search for activity compatible with a B+→K+τ+τ- decay in the rest of the event. Each τ lepton is required to decay leptonically into an electron or muon and neutrinos. Comparing the expected number of background events with the data sample after applying the selection criteria, we do not find evidence for a signal. The resulting upper limit, at the 90% confidence level, is B(B+→K+τ+τ-)<2.25×10-3.

Original languageEnglish (US)
Article number031802
JournalPhysical review letters
Issue number3
StatePublished - Jan 20 2017
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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