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
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^-).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.