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Aaij, R.; Beaucourt, L.; Chefdeville, M.; Decamp, D.; Déléage, N.; Ghez, P.; Marchand, J.-F.; Minard, M.-N.; Pietrzyk, B.; t'Jampens, S.; Tisserand, V.; Tournefier, E.; Xu, Z.; Ajaltouni, Z.J.; Baalouch, M.; Cogneras, E.; Deschamps, O.; Gazzoni, G.; Hadjivasiliou, C.; Henrard, P.; Kozeiha, M.; Lefèvre, R.; Maratas, J.; Monteil, S.; Perret, P.; Vernet, M.; Arnau Romeu, J.; Aslanides, E.; Cogan, J.; De Bruyn, K.; Legac, R.; Leroy, O.; Mancinelli, G.; Martin, M.; Mordà, A.; Serrano, J.; Tayduganov, A.; Tsaregorodtsev, A.
Physical review letters, 03/2017, Letnik: 118Journal Article
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−).
