A search for the rare decays B_s^0→τ^+τ^- and B^0→τ^+τ^- is performed using proton-proton collision data collected with the LHCb detector. The data sample corresponds to an integrated luminosity of 3  fb^-1 collected in 2011 and 2012. The τ leptons are reconstructed through the decay τ^-→π^-π^+π^-ν_τ. Assuming no contribution from B^0→τ^+τ^- decays, an upper limit is set on the branching fraction B(B_s^0→τ^+τ^-)<6.8×10^-3 at the 95% confidence level. If instead no contribution from B_s^0→τ^+τ^- decays is assumed, the limit is B(B^0→τ^+τ^-)<2.1×10^-3 at the 95% confidence level. These results correspond to the first direct limit on B(B_s^0→τ^+τ^-) and the world's best limit on B(B^0→τ^+τ^-).

Search for the Decays B_s^0→τ^+τ^- and B^0→τ^+τ^-

Veltri, M;
2017-01-01

Abstract

A search for the rare decays B_s^0→τ^+τ^- and B^0→τ^+τ^- is performed using proton-proton collision data collected with the LHCb detector. The data sample corresponds to an integrated luminosity of 3  fb^-1 collected in 2011 and 2012. The τ leptons are reconstructed through the decay τ^-→π^-π^+π^-ν_τ. Assuming no contribution from B^0→τ^+τ^- decays, an upper limit is set on the branching fraction B(B_s^0→τ^+τ^-)<6.8×10^-3 at the 95% confidence level. If instead no contribution from B_s^0→τ^+τ^- decays is assumed, the limit is B(B^0→τ^+τ^-)<2.1×10^-3 at the 95% confidence level. These results correspond to the first direct limit on B(B_s^0→τ^+τ^-) and the world's best limit on B(B^0→τ^+τ^-).
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11576/2666776
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