# $B$ flavour tagging using charm decays at the LHCb experiment

Abstract : An algorithm is described for tagging the flavour content at production of neutral $B$ mesons in the LHCb experiment. The algorithm exploits the correlation of the flavour of a $B$ meson with the charge of a reconstructed secondary charm hadron from the decay of the other $b$ hadron produced in the proton-proton collision. Charm hadron candidates are identified in a number of fully or partially reconstructed Cabibbo-favoured decay modes. The algorithm is calibrated on the self-tagged decay modes $B^+ \to J/\psi \, K^+$ and $B^0 \to J/\psi \, K^{*0}$ using $3.0\mathrm{\,fb}^{-1}$ of data collected by the LHCb experiment at $pp$ centre-of-mass energies of $7\mathrm{\,TeV}$ and $8\mathrm{\,TeV}$. Its tagging power on these samples of $B \to J/\psi \, X$ decays is $(0.30 \pm 0.01 \pm 0.01) \%$.
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Journal articles
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http://hal.in2p3.fr/in2p3-01181098
Contributor : Sabine Starita <>
Submitted on : Wednesday, July 29, 2015 - 9:58:09 AM
Last modification on : Monday, June 3, 2019 - 1:38:03 PM

### Citation

R. Aaij, Y. Amhis, S. Barsuk, M. Borsato, O. Kochebina, et al.. $B$ flavour tagging using charm decays at the LHCb experiment. Journal of Instrumentation, IOP Publishing, 2015, 10, pp.P10005. ⟨10.1088/1748-0221/10/10/P10005⟩. ⟨in2p3-01181098⟩

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