Observation of the Decay B[+ over c] →B[0 over s]π[superscript +]
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Aaij-2013-Observation of the decay.pdf
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Author(s)
Williams, Michael
Date Issued
November 2013
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Aaij, R., B. Adeva, M. Adinolfi, C. Adrover, A. Affolder, Z. Ajaltouni, J. Albrecht, et al. “Observation of the Decay B[+ over c] →B[0 over s]π[superscript +].” Physical Review Letters 111, no. 18 (November 2013). © 2013 CERN, for the LHCb Collaboration
Version
Final published version
Abstract
The result of a search for the decay B[+ over c] → B[0 over s]π[superscript +] is presented, using the B[0 over s] → D[bar over s]π[superscript +] and B[0 over s] → J/ψϕ 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[superscript −1] taken at a center-of-mass energy of 7 TeV, and 2 fb[superscript −1] taken at 8 TeV. The decay B[+ over c] → B[0 over s]π[superscript +] 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(B[+ over c])/σ(B[0 over s])] × B(B[+ over c] → B[0 over s]π[superscript +]) = [2.37 ± 0.31 (stat) ± 0.11 (syst)[+0.17 over −0.13](τ[subscript B][+ over c])] × 10[superscript −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 B[+ over c] lifetime. This is the first observation of a B meson decaying to another B meson via the weak interaction.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.111.181801
