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

(BaBar Collaboration)

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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
Article number031802
JournalPhysical Review Letters
Issue number3
StatePublished - 20 Jan 2017


FundersFunder number
National Science Foundation1404070
National Science Foundation
Science and Technology Facilities CouncilST/N000420/1
Science and Technology Facilities Council


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