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Observation of the annihilation decay mode B^{0}→K^{+}K^{-}
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LHCb Collaboration (Including: Back, J. J., Blake, Thomas, Costa Sobral, Cayo, Crocombe, Andrew, Gershon, T. J., Kreps, Michal, Latham, T. E., Loh, David, Mathad, Abhijit , O'Hanlon, Daniel P., Poluektov, Anton, Wallace, Charlotte and Wicht, Jean). (2017) Observation of the annihilation decay mode B^{0}→K^{+}K^{-}. Physical Review Letters, 118 (8). 081801 . doi:10.1103/PhysRevLett.118.081801 ISSN 0031-9007.
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Official URL: http://doi.org/10.1103/PhysRevLet.118.081801
Abstract
A search for the B^{0}→K^{+}K^{-} decay is performed using pp-collision data collected by LHCb. The data set corresponds to integrated luminosities of 1.0 and 2.0 fb^{-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_{s}^{0}→π^{+}π^{-} decay. The measured branching fractions are B(B^{0}→K^{+}K^{-})=(7.80±1.27±0.81±0.21)×10^{-8} and B(B_{s}^{0}→π^{+}π^{-})=(6.91±0.54±0.63±0.19±0.40)×10^{-7}. The first uncertainty is statistical, the second is systematic, the third is due to the uncertainty on the B^{0}→K^{+}π^{-} branching fraction used as a normalization. For the B_{s}^{0} mode, the fourth accounts for the uncertainty on the ratio of the probabilities for b quarks to hadronize into B_{s}^{0} and B^{0} mesons.
| Item Type: | Journal Article | ||||||
|---|---|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
| SWORD Depositor: | Library Publications Router | ||||||
| Journal or Publication Title: | Physical Review Letters | ||||||
| Publisher: | American Physical Society | ||||||
| ISSN: | 0031-9007 | ||||||
| Official Date: | 24 February 2017 | ||||||
| Dates: |
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| Volume: | 118 | ||||||
| Number: | 8 | ||||||
| Article Number: | 081801 | ||||||
| DOI: | 10.1103/PhysRevLett.118.081801 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Open Access (Creative Commons) |
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