Search for the decays $B_s^0\toτ^+τ^-$ and $B^0\toτ^+τ^-$
Creators: name: LHCb Collaboration
name: Aaij, R.
name: Adeva, B.
name: Adinolfi, M.
name: Ajaltouni, Z.
name: Akar, S.
name: Albrecht, J.
name: Alessio, F.
name: Alexander, M.
name: Ali, S.
name: Alkhazov, G.
name: Cartelle, P. Alvarez
name: Alves, A. A.
name: Amato, S.
name: Amerio, S.
name: Amhis, Y.
name: An, L.
name: Anderlini, L.
name: Andreassi, G.
name: Andreotti, M.
name: Andrews, J. E.
name: Appleby, R. B.
name: Archilli, F.
name: d'Argent, P.
name: Romeu, J. Arnau
name: Artamonov, A.
name: Artuso, M.
name: Aslanides, E.
name: Auriemma, G.
name: Baalouch, M.
name: Babuschkin, I.
name: Bachmann, S.
name: Back, J. J.
name: Badalov, A.
name: Baesso, C.
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name: Baldini, W.
name: Baranov, A.
name: Barlow, R. J.
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name: Barsuk, S.
name: Barter, W.
name: Baryshnikov, F.
name: Baszczyk, M.
name: Batozskaya, V.
name: Batsukh, B.
name: Battista, V.
name: Bay, A.
name: Beaucourt, L.
name: Beddow, J.
name: Bedeschi, F.
name: Bediaga, I.
name: Beiter, A.
name: Bel, L. J.
name: Bellee, V.
name: Belloli, N.
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name: Ben-Haim, E.
name: Bencivenni, G.
name: Benson, S.
name: Beranek, S.
name: Berezhnoy, A.
name: Bernet, R.
name: Bertolin, A.
name: Betancourt, C.
name: Betti, F.
name: Bettler, M. -O.
name: van Beuzekom, M.
name: Bezshyiko, Ia.
name: Bifani, S.
name: Billoir, P.
name: Birnkraut, A.
name: Bitadze, A.
name: Bizzeti, A.
name: Blake, T.
name: Blanc, F.
name: Blouw, J.
name: Blusk, S.
name: Bocci, V.
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name: Xing, Z.
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name: Yang, Z.
name: Yang, Z
name: Yao, Y.
name: Yin, H.
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name: Zarebski, K. A.
name: Zavertyaev, M.
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Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: A search for the rare decays $B_s^0\toτ^+τ^-$ and $B^0\toτ^+τ^-$ 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 $τ^-\toπ^-π^+π^-ν_τ$. Assuming no contribution from $B^0\toτ^+τ^-$ decays, an upper limit is set on the branching fraction $\mathcal{B}(B_s^0\toτ^+τ^-) &lt; 6.8\times 10^{-3}$ at 95% confidence level. If instead no contribution from $B_s^0\toτ^+τ^-$ decays is assumed, the limit is $\mathcal{B}(B^0\toτ^+τ^-)&lt; 2.1 \times 10^{-3}$ at 95% confidence level. These results correspond to the first direct limit on $\mathcal{B}(B_s^0\toτ^+τ^-)$ and the world's best limit on $\mathcal{B}(B^0\toτ^+τ^-)$.
description: 21 pages, 10 figures. All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2017-003.html