A search for the rare decays Bs0 → τ+τ− and B0 → 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−ντ. Assuming no contribution from B0 → τ+τ− decays, an upper limit is set on the branching fraction B(Bs0 → τ+τ−) < 6.8×10−3 at 95% confidence level. If instead no contribution from Bs0 → τ+τ− decays is assumed, the limit is B(B0 → τ+τ−) < 2.1 × 10−3 at 95% confidence level. These results correspond to the first direct limit on B(Bs0 → τ+τ−) and the world’s best limit on B(B0 → τ+τ−).
|Original language||English (US)|
|State||Published - Mar 7 2017|
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