Search for the Decays B0s → τ + τ − and B0 → τ + τ −

LHCb Collaboration, Andrew Cook, Jeremy Dalseno, Sam Harnew, James Kariuki, Paras Naik, Konstantinos Petridis, Gabriela Pomery, Eugenia Price, Claire Prouve, Renato Quagliani, Jonas Rademacker, Felix Richards, Daniel Saunders, Nicola Skidmore, Jaap Velthuis

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A search for the rare decays B0 s → τþτ− and B0 → τþτ− 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−πþπ−ντ. Assuming no contribution from B0 → τþτ− decays, an upper limit is set on the branching fraction BðB0 s → τþτ−Þ < 6.8 × 10−3 at the 95% confidence level. If instead no contribution from B0 s → τþτ− decays is assumed, the limit is BðB0 → τþτ−Þ < 2.1 × 10−3 at the 95% confidence level. These results correspond to the first direct limit on BðB0 s → τþτ−Þ and the world’s best limit on BðB0 → τþτ−Þ.
Original languageEnglish
Article number251802
JournalPhysical Review Letters
Publication statusPublished - 21 Jun 2017

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