# Search for the decays B0s→τ+τ− and B0→τ+τ−

Abstract : A search for the rare decays B0s→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 3fb−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(B0s→τ+τ−)<6.8×10−3 at 95\% confidence level. If instead no contribution from B0s→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(B0s→τ+τ−) and the world's best limit on B(B0→τ+τ−).
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-01485630
Contributor : Claudine Bombar <>
Submitted on : Thursday, March 9, 2017 - 10:54:02 AM
Last modification on : Tuesday, April 20, 2021 - 12:00:16 PM

### Citation

R. Aaij, L. Beaucourt, M. Chefdeville, D. Decamp, N. Déléage, et al.. Search for the decays B0s→τ+τ− and B0→τ+τ−. Physical Review Letters, American Physical Society, 2017, 118, pp.251802. ⟨10.1103/PhysRevLett.118.251802⟩. ⟨in2p3-01485630⟩

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