$B$ 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 $B^0\to J/\psi K^{\ast 0}$ 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 $(0.30\pm 0.01\pm 0.01)\%$.

arXiv commentAll figures and tables, along with any supplementary material and additional information, are available at http://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2015-027.html

References in corpus (19)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• A Brief Introduction to PYTHIA 8.1
• LHCb Detector Performance
• PHOTOS Monte Carlo: a precision tool for QED corrections in Z and W decays
• sPlot: a statistical tool to unfold data distributions
• The LHCb Trigger and its Performance in 2011
• Performance of the LHCb RICH detector at the LHC
• Performance of the LHCb Vertex Locator
• Performance of the LHCb Outer Tracker
• Performance of the LHCb muon system
• Mass distributions marginalized over per-event errors
• Precision measurement of $CP$ violation in $B_s^0\to J/\psi K^{+}{K}^{-}$ decays
• Opposite-side flavour tagging of B mesons at the LHCb experiment
• Measurement of the CP-violating phase $\beta$ in $B^0\to J/\psi {\pi }^{+}{\pi }^{-}$ decays and limits on penguin effects
• Method for Flavor Tagging in Neutral B Meson Decays
• Measurement of $CP$ violation in $B^0\to J/\psi K_S^0$ decays
• Measurement of the CP-violating phase ${\varphi }_s$ in ${\bar{B}}_s^0\to D_s^{+}{D}_s^{-}$ decays
• Measurement of the time-dependent CP asymmetries in $B_s^0\to J/\psi K_{\mathrm{S}}^0$

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• The CKM Parameters
• Precise determination of the B0s-B0sbar oscillation frequency
• CP violation in the B system
• A new algorithm for identifying the flavour of $B_s^0$ mesons at LHCb
• New algorithms for identifying the flavour of $B^0$ mesons using pions and protons
• Measurement of $CP$ violation in $B^0\to D^{+}{D}^{-}$ decays
• Measurement of the CKM angle $\gamma$ and $B_s^0$-${\bar{B}}_s^0$ mixing frequency with $B_s^0\to D_s^{\mp }{h}^{\pm }{\pi }^{\pm }{\pi }^{\mp }$ decays
• Measurement of $CP$ violation in $B^0\to D^{\mp }{\pi }^{\pm }$ decays
• Inclusive Flavour Tagging Algorithm
• Charmonia production from $b$-hadron decays at LHC with $k_T$-factorization: $J/\psi$, $\psi (2S)$ and $J/\psi +Z$
• Measurement of $CP$ violation in $B^0\to D^{\ast \pm }{D}^{\mp }$ decays
• Statistical biases in measurements with multiple candidates
• Measurement of $CP$ asymmetry in $B_s^0\to D_s^{\mp }{K}^{\pm }$ decays
• CP violation and CKM studies (and first LHCb Run II results)
• Measurement of $CP$ violation in $B^0\to D^{+}{D}^{-}$ and $B_s^0\to D_s^{+}{D}_s^{-}$ decays
• Visualisation of $CP$-violation effects in decay-time-dependent analyses of multibody $B$-meson decays
• Inclusive $B$-meson flavour-tagging algorithm at LHCb
• Measurement of $CP$ violation in $B^0\to J/\psi K_{\mathrm{S}}^0$ and $B^0\to \psi (2S)K_{\mathrm{S}}^0$ decays