Observation of the Annihilation Decay Mode B[superscript 0]→K[superscript +]K[superscript -]
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PhysRevLett.118.081801.pdf
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Author(s)
Aaij, R.
Adeva, B.
Adinolfi, M.
Ajaltouni, Z.
Akar, S.
Albrecht, J.
Alessio, F.
Alexander, M.
Ali, S.
Alkhazov, G.
Date Issued
February 2017
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Aaij, R. et al. “Observation of the Annihilation Decay Mode B[superscript 0] → K[superscript +] K[superscript −].” Physical Review Letters 118, 081801 (February 2017): 1-9 © 2017 CERN for the LHCb Collaboration
Version
Final published version
Abstract
A search for the B[superscript 0]→K[superscript +]K[superscript -] decay is performed using pp-collision data collected by LHCb. The data set corresponds to integrated luminosities of 1.0 and 2.0 fb[superscript -1] at center-of-mass energies of 7 and 8 TeV, respectively. This decay is observed for the first time, with a significance of more than 5 standard deviations. The analysis also results in an improved measurement of the branching fraction for the B[subscript s][superscript 0]→π[superscript+]π[superscript -] decay. The measured branching fractions are B(B[superscript 0]→K[superscript +]K[superscript -])=(7.80±1.27±0.81±0.21)×10[superscript -8] and B(B[subscript s][superscript 0]→π[superscript +]π[superscript -])=(6.91±0.54±0.63±0.19±0.40)×10[superscript -7]. The first uncertainty is statistical, the second is systematic, the third is due to the uncertainty on the B[superscript 0]→K[superscript +]π[superscript -] branching fraction used as a normalization. For the B[subscript s][superscript 0] mode, the fourth accounts for the uncertainty on the ratio of the probabilities for b quarks to hadronize into B[subscript s][superscript 0] and B[superscript 0] mesons.
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
http://dx.doi.org/10.1103/PhysRevLett.118.081801
