The result of a search for the decay Bc+ → B0s π+ is presented, using the B0s → Ds− π+ and B0s → J/ψ ϕ channels. The analysis is based on a data sample of pp collisions collected with the LHCb detector, corresponding to an integrated luminosity of 1 fb^−1 taken at a center-of-mass energy of 7 TeV, and 2 fb^−1 taken at 8 TeV. The decay Bc+ → B0s π+ is observed with significance in excess of 5 standard deviations independently in both decay channels. The measured product of the ratio of cross sections and branching fraction is [σ(Bc+) / σ(B0s)] x B(Bc+ → B0s π+) = [2.37 ± 0.31(stat) ± 0.11(syst) {−0.13}{+0.17}(τBc+)] x 10^−3, in the pseudorapidity range 2 < η(B) < 5, where the first uncertainty is statistical, the second is systematic, and the third is due to the uncertainty on the Bc+ lifetime. This is the first observation of a B meson decaying to another B meson via the weak interaction.

Aaij, R., Adeva, B., Adinolfi, M., Adrover, C., Affolder, A., Ajaltouni, Z., et al. (2013). Observation of the Decay Bc+ → B0s π+. PHYSICAL REVIEW LETTERS, 111(18), 1-9 [10.1103/PhysRevLett.111.181801].

Observation of the Decay Bc+ → B0s π+

CARBONE, ANGELO;A. Di Canto;GALLI, DOMENICO;PATRIGNANI, CLAUDIA;PERAZZINI, STEFANO;VAGNONI, VINCENZO MARIA;ZANGOLI, MARIA;
2013

Abstract

The result of a search for the decay Bc+ → B0s π+ is presented, using the B0s → Ds− π+ and B0s → J/ψ ϕ channels. The analysis is based on a data sample of pp collisions collected with the LHCb detector, corresponding to an integrated luminosity of 1 fb^−1 taken at a center-of-mass energy of 7 TeV, and 2 fb^−1 taken at 8 TeV. The decay Bc+ → B0s π+ is observed with significance in excess of 5 standard deviations independently in both decay channels. The measured product of the ratio of cross sections and branching fraction is [σ(Bc+) / σ(B0s)] x B(Bc+ → B0s π+) = [2.37 ± 0.31(stat) ± 0.11(syst) {−0.13}{+0.17}(τBc+)] x 10^−3, in the pseudorapidity range 2 < η(B) < 5, where the first uncertainty is statistical, the second is systematic, and the third is due to the uncertainty on the Bc+ lifetime. This is the first observation of a B meson decaying to another B meson via the weak interaction.
2013
Aaij, R., Adeva, B., Adinolfi, M., Adrover, C., Affolder, A., Ajaltouni, Z., et al. (2013). Observation of the Decay Bc+ → B0s π+. PHYSICAL REVIEW LETTERS, 111(18), 1-9 [10.1103/PhysRevLett.111.181801].
Aaij, R.; Adeva, B.; Adinolfi, M.; Adrover, C.; Affolder, A.; Ajaltouni, Z.; Albrecht, J.; Alessio, F.; Alexander, M.; Ali, S.; Alkhazov, G.; Alvarez ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/192939
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