Search for B⁺→K⁺τ⁺τ⁻ at the BaBar Experiment
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PhysRevLett.118.031802.pdf
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Author(s)
Lees, J. P.
Poireau, V.
Tisserand, V.
Grauges, E.
Palano, A.
Eigen, G.
Brown, D. N.
Kolomensky, Yu. G.
Koch, H.
Schroeder, T.
Date Issued
January 2017
Publisher
American Physical Society
Citation
Lees, J. P.; Poireau, V.; Tisserand, V.; Grauges, E. et al. "Search for B⁺→K⁺τ⁺τ⁻ at the BaBar Experiment" Physical Review Letters 118, 031802 (January 2017): 1-8 © 2017 American Physical Society
Version
Final published version
Abstract
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 ϒ(4S) resonance, corresponds to a total integrated luminosity of 424 fb⁻¹} and to 471×10⁶ BB[over ¯] pairs. We reconstruct one B meson, produced in the ϒ(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}.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.118.031802
