First observation of B[superscript +] → D[subscript s][superscript +]K[superscript +]K[superscript −] decays and a search for B[superscript +] → D[subscript s][superscript +]ϕ decays
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Author(s)
Aaij, R.
Adeva, B.
Adinolfi, M.
Ajaltouni, Z.
Akar, S.
Albrecht, J.
Alessio, F.
Alexander, M.
Alfonso Albero, A.
Ali, S.
Date Issued
January 2018
Journal
Journal of High Energy Physics
Publisher
Springer Berlin Heidelberg
Citation
The LHCb collaboration, et al. “First Observation of B[superscript +] → D[subscript s][superscript +] K[superscript +]K[superscript −] Decays and a Search for B[superscript +] → D[subscript s][superscript +]ϕ Decays.” Journal of High Energy Physics, vol. 2018, no. 1, Jan. 2018. © 2018 The Authors
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Final published version
Abstract
A search for B[superscript +] → D[superscript +][subscript s] K[superscript +]K[superscript −] decays is performed using pp collision data corresponding to an integrated luminosity of 4.8 fb[superscript −1], collected at centre-of-mass energies of 7, 8 and 13 TeV with the LHCb experiment. A significant signal is observed for the first time and the branching fraction is determined to be B(B[superscript +] → D[superscript +][subscript s] K[superscript +]K[superscript −]) = (7.1 ± 0.5 ± 0.6 ± 0.7) × 10[superscript −6], where the first uncertainty is statistical, the second systematic and the third due to the
uncertainty on the branching fraction of the normalisation mode B[superscript +] → D[superscript +][subscript s][bar over D][superscript 0]. A search is also performed for the pure annihilation decay B[superscript +] → D[superscript +][subscript s] φ. No significant signal is observed and a limit of B(B[superscript +] → D[superscript +][subscript s] φ) < 4.9 × 10[superscript −7] (4.2 × 10[superscript −7]) is set on the branching fraction at 95% (90%) confidence level. Keywords: B physics, Branching fraction, Hadron-Hadron scattering (experiments), Rare decay
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1007/JHEP01(2018)131
