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Search for B+→K+τ+τ− at the BaBar experiment
Journal article   Open access   Peer reviewed

Search for B+→K+τ+τ− at the BaBar experiment

A. M. Eisner, J Albert, H Koch, A Palano, W. S Lockman, A. J Lankford, T Schroeder, G Eigen, W. Panduro Vazquez, C Hearty, …
Physical review letters, Vol.118(3), 031802
01/20/2017
DOI: 10.1103/PhysRevLett.118.031802
PMID: 28157371
url
https://doi.org/10.1103/PhysRevLett.118.031802View
Published (Version of record) Open Access

Abstract

We search for the rare flavor-changing neutral current process $B^{+}\rightarrow K^{+}\tau^{+}\tau^{-}$ using data from the BABAR experiment. The data sample, collected at the center-of-mass energy of the $\Upsilon{(4S)}$ resonance, corresponds to a total integrated luminosity of 424 fb$^{-1}$ and to 471 million $B\overline{B}$ pairs. We reconstruct one $B$ meson, produced in the $\Upsilon{(4S)}\rightarrow B^{+} B^{-}$ decay, in one of many hadronic decay modes and search for activity compatible with a $B^{+}\rightarrow K^{+} \tau^{+}\tau^{-}$ decay in the rest of the event. Each $\tau$ 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 measured branching fraction is ($1.31^{+0.66}_{-0.61}$( stat.)$^{+0.35}_{-0.25}$( sys.)$) \times 10^{-3}$ with an upper limit, at the 90\% confidence level, of $\mathcal{B}(B^{+}\rightarrow K^{+}\tau^{+}\tau^{-})$$< 2.25\times 10^{-3}$.
High Energy Physics Particle Physics Physics asjc Astronomy(all) atira Experiment Experiments Física de partícules Phenomenology pure subjectarea

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