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 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(B0s → τ+τ−) < 6.8 × 10−3 at the 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 the 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−)
Aaij, R., Adeva, B., Adinolfi, M., Ajaltouni, Z., Akar, S., Albrecht, J., et al. (2017). Search for the Decays B0s →τ+τ− and B0 →τ+τ−. PHYSICAL REVIEW LETTERS, 118(25) [10.1103/PhysRevLett.118.251802].
Search for the Decays B0s →τ+τ− and B0 →τ+τ−
Belloli, N.;Borgheresi, A.;Borsato, M.;Calvi, M.;Carniti, P.;Cassina, L.;Fazzini, D.;Gotti, C.
;Grillo, L.;Martinelli, M.;Matteuzzi, C.;Petruzzo, M.;
2017
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 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(B0s → τ+τ−) < 6.8 × 10−3 at the 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 the 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−)
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
