The LHCb Trigger and its Performance in 2011

Abstract

This paper presents the design of the LHCb trigger and its performance on data taken at the LHC in 2011. A principal goal of LHCb is to perform flavour physics measurements, and the trigger is designed to distinguish charm and beauty decays from the light quark background. Using a combination of lepton identification and measurements of the particles' transverse momenta the trigger selects particles originating from charm and beauty hadrons, which typically fly a finite distance before decaying. The trigger reduces the roughly 11\,MHz of bunch-bunch crossings that contain at least one inelastic $pp$ interaction to 3\,kHz. This reduction takes place in two stages; the first stage is implemented in hardware and the second stage is a software application that runs on a large computer farm. A data-driven method is used to evaluate the performance of the trigger on several charm and beauty decay modes.

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Cited by in corpus (419)

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• Observation of five new narrow ${\Omega }_c^0$ states decaying to ${\Xi }_c^{+}{K}^{-}$
• Measurement of the $B_s^0\to {\mu }^{+}{\mu }^{-}$ branching fraction and search for $B^0\to {\mu }^{+}{\mu }^{-}$ decays at the LHCb experiment
• Measurement of $CP$-averaged observables in the $B^0\to K^{\ast 0}{\mu }^{+}{\mu }^{-}$ decay
• Measurement of the ratio of branching fractions $\mathcal{B}(B_c^{+}\to J/\psi {\tau }^{+}{\nu }_{\tau })$/$\mathcal{B}(B_c^{+}\to J/\psi {\mu }^{+}{\nu }_{\mu })$
• Evidence of a $J/\psi \Lambda$ structure and observation of excited ${\Xi }^{-}$ states in the ${\Xi }_b^{-}\to J/\psi \Lambda K^{-}$ decay
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• Measurement of the fragmentation fraction ratio $f_s/f_d$ and its dependence on $B$ meson kinematics
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• Study of $D_J$ meson decays to $D^{+}{\pi }^{-}$, $D^0{\pi }^{+}$ and $D^{\ast +}{\pi }^{-}$ final states in pp collision
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• Study of the $D^{0}p$ amplitude in ${\Lambda }_b^0\to D^{0}p{\pi }^{-}$ decays
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• Measurements of the Lambda_b0 -> J/psi Lambda decay amplitudes and the Lambda_b0 polarisation in pp collisions at sqrt(s) = 7 TeV
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• Observation of two resonances in the ${\Lambda }_b^0{\pi }^{\pm }$ systems and precise measurement of ${\Sigma }_b^{\pm }$ and ${\Sigma }_b^{\ast \pm }$ properties
• First measurement of charm production in fixed-target configuration at the LHC
• Observation of two new ${\Xi }_b^{-}$ baryon resonances
• Observation of a resonance in $B^{+}\to K^{+}{\mu }^{+}{\mu }^{-}$ decays at low recoil
• Amplitude analysis of the $B^{+}\to {\pi }^{+}{\pi }^{+}{\pi }^{-}$ decay
• Observation of the decay ${\Lambda }_b^0\to {\Lambda }_c^{+}{\tau }^{-}{\overline{\nu }}_{\tau }$
• Angular analysis of the $B^0\to K^{\ast 0}{e}^{+}{e}^{-}$ decay in the low-$q^2$ region
• Measurement of D0-D0bar mixing parameters and search for CP violation using D0->K+pi- decays
• Measurement of the ratios of branching fractions $\mathcal{R}(D^{\ast })$ and $\mathcal{R}(D^0)$
• Search for the lepton flavour violating decay ${\tau }^{-}\to {\mu }^{-}{\mu }^{+}{\mu }^{-}$
• Measurement of $\psi (2S)$ polarisation in $pp$ collisions at $\sqrt{s}=7$ TeV
• Search for massive long-lived particles decaying semileptonically in the LHCb detector
• Observation of the decay Bc+ -> Bs0 pi+
• First observation and amplitude analysis of the $B^{-}\to D^{+}{K}^{-}{\pi }^{-}$ decay
• Observation of several sources of $CP$ violation in $B^{+}\to {\pi }^{+}{\pi }^{+}{\pi }^{-}$ decays
• Precision measurement of the ratio of the ${\Lambda }_b^0$ to ${\overline{B}}^0$ lifetimes
• Observation of new resonances in the ${\Lambda }_b^0{\pi }^{+}{\pi }^{-}$ system
• Test of lepton flavour universality using $B^0\to D^{\ast -}{\tau }^{+}{\nu }_{\tau }$ decays with hadronic $\tau$ channels
• Observation of new ${\Xi }_c^0$ baryons decaying to ${\Lambda }_c^{+}{K}^{-}$
• Study of forward Z+jet production in pp collisions at $\sqrt{s}=7$ TeV
• Measurement of the phase difference between short- and long-distance amplitudes in the $B^{+}\to K^{+}{\mu }^{+}{\mu }^{-}$ decay
• Angular moments of the decay ${\Lambda }_b^0\to \Lambda {\mu }^{+}{\mu }^{-}$ at low hadronic recoil
• Search for the doubly charmed baryon ${\Xi }_{cc}^{+}$
• Evidence for an ${\eta }_c(1S){\pi }^{-}$ resonance in $B^0\to {\eta }_c(1S)K^{+}{\pi }^{-}$ decays
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• Study of ${\rm Y}$ production and cold nuclear matter effects in pPb collisions at $\sqrt{s_{NN}}=5\mathrm{TeV}$
• Search for direct CP violation in D0 -> h- h+ modes using semileptonic B decays
• Observation of the decay $B_c^{+}\to \psi (2S){\pi }^{+}$
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• Precision measurement of the mass and lifetime of the ${\Xi }_b^0$ baryon
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• Search for the rare decay $D^0\to {\mu }^{+}{\mu }^{-}$
• Measurement of the semileptonic $CP$ asymmetry in $B^0-\overline{B}{}^0$ mixing
• Amplitude analysis and branching fraction measurement of Bs->J/ψK+K-
• Measurement of J/psi production in pp collisions at sqrt(s)=2.76 TeV
• Angular analysis of charged and neutral $B\to K{\mu }^{+}{\mu }^{-}$ decays
• Measurement of the flavour-specific CP-violating asymmetry $a_{\mathrm{sl}}^s$ in $B_s^0$ decays
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• Search for long-lived particles decaying to jet pairs
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• Search for the lepton-flavour-violating decays $B_s^0\to {\tau }^{\pm }{\mu }^{\mp }$ and $B^0\to {\tau }^{\pm }{\mu }^{\mp }$
• Searches for violation of lepton flavour and baryon number in tau lepton decays at LHCb
• Search for CP violation in the decay $D^{+}\to {\pi }^{-}{\pi }^{+}{\pi }^{+}$
• Flavor Anomalies in Heavy Quark Decays
• Measurements of the $B^{+}$, $B^0$, $B_s^0$ meson and ${\Lambda }_b^0$ baryon lifetimes
• Measurement of $CP$ violation in $B^0\to J/\psi K_S^0$ decays
• Measurement of the $B_c^{+}$ meson lifetime using $B_c^{+}\to J/\psi {\mu }^{+}{\nu }_{\mu }X$ decays
• Amplitude analysis of $B^0\to {\bar{D}}^0{K}^{+}{\pi }^{-}$ decays
• Forward production of ${\rm Y}$ mesons in $pp$ collisions at $\sqrt{s}=7$ and 8TeV
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• Measurement of the shape of the ${\Lambda }_b^0\to {\Lambda }_c^{+}{\mu }^{-}\overline{\nu }$ differential decay rate
• Search for the doubly heavy baryons ${\Omega }_{bc}^0$ and ${\Xi }_{bc}^0$ decaying to ${\Lambda }_c^{+}{\pi }^{-}$ and ${\Xi }_c^{+}{\pi }^{-}$
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• Updated measurement of time-dependent $CP$-violating observables in $B_s^0\to J/\psi K^{+}{K}^{-}$ decays
• Rare Decays and CP Violation in the $B_s$ System
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• Measurement of $CP$ asymmetry in $D^0\to K^{-}{K}^{+}$ decays
• Observation of a new baryon state in the ${\Lambda }_b^0{\pi }^{+}{\pi }^{-}$ mass spectrum
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• Precision measurement of the Lambda_b baryon lifetime
• First study of the CP-violating phase and decay-width difference in $B_s^0\to \psi (2S)\varphi$ decays
• Search for Higgs-like bosons decaying into long-lived exotic particles
• Searches for ${\Lambda }_b^0$ and ${\Xi }_b^0$ decays to $K_{\mathrm{S}}^{0}p{\pi }^{-}$ and $K_{\mathrm{S}}^{0}p{K}^{-}$ final states with first observation of the ${\Lambda }_b^0\to K_{\mathrm{S}}^{0}p{\pi }^{-}$ decay
• Measurements of indirect CP asymmetries in $D^0\to K^{-}{K}^{+}$ and $D^0\to {\pi }^{-}{\pi }^{+}$ decays
• Measurement of $B^{+}$, $B^0$ and ${\Lambda }_b^0$ production in $p\mathrm{Pb}$ collisions at $\sqrt{s_{\mathrm{NN}}}=8.16\mathrm{TeV}$
• Search for the lepton-flavour violating decay $D^0\to e^{\pm }{\mu }^{\mp }$
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• Measurement of $CP$ asymmetries in two-body $B_{(s)}^0$-meson decays to charged pions and kaons
• Measurement of the ratio of $B_c^{+}$ branching fractions to $J/\psi {\pi }^{+}$ and $J/\psi {\mu }^{+}{\nu }_{\mu }$
• Studies of the resonance structure in $D^0\to K^{\mp }{\pi }^{\pm }{\pi }^{\pm }{\pi }^{\mp }$ decays
• Observation of $D^0$ meson decays to ${\pi }^{+}{\pi }^{-}{\mu }^{+}{\mu }^{-}$ and $K^{+}{K}^{-}{\mu }^{+}{\mu }^{-}$ final states
• First observation of the decay $B_s^0\to K^{-}{\mu }^{+}{\nu }_{\mu }$ and a measurement of $|V_{ub}|/|V_{cb}|$
• Observation of B^0_(s) -> J/ψf_1(1285) decays and measurement of the f_1(1285) mixing angle
• Measurement of the CP asymmetry in B0 -> K*0 mu+ mu- decays
• Measurement of indirect $CP$ asymmetries in $D^0\to K^{-}{K}^{+}$ and $D^0\to {\pi }^{-}{\pi }^{+}$ decays using semileptonic $B$ decays
• Unleashing the full power of LHCb to probe Stealth New Physics
• Measurement of the $B_c^{-}$ meson production fraction and asymmetry in 7 and 13 TeV $pp$ collisions
• Measurement of the polarisation amplitudes in B0 -> J/psi K*(892)0 decays
• Search for the lepton-flavour violating decays $B_s^0\to e^{\pm }{\mu }^{\mp }$ and $B^0\to e^{\pm }{\mu }^{\mp }$
• Observation of the decay $B_c\to J/\psi K^{+}{K}^{-}{\pi }^{+}$
• First observation of a baryonic $B_c^{+}$ decay
• Measurement of CP violation parameters in B0->D K*0 decays
• Evidence for the rare decay ${\Sigma }^{+}\to p{\mu }^{+}{\mu }^{-}$
• Measurement of Upsilon production in pp collisions at sqrt{s}=2.76 TeV
• First measurement of the CP-violating phase in $B_s^0\to \varphi \varphi$ decays
• Precision measurement of the ${\Lambda }_c^{+}$, ${\Xi }_c^{+}$ and ${\Xi }_c^0$ baryon lifetimes
• $B$ flavour tagging using charm decays at the LHCb experiment
• First observation of $D^0-{\bar{D}}^0$ oscillations in $D^0\to K^{+}{\pi }^{-}{\pi }^{+}{\pi }^{-}$ decays and measurement of the associated coherence parameters
• Precise determination of the B0s-B0sbar oscillation frequency
• Observations of ${\Lambda }_b^0\to \Lambda K^{+}{\pi }^{-}$ and ${\Lambda }_b^0\to \Lambda K^{+}{K}^{-}$ decays and searches for other ${\Lambda }_b^0$ and ${\Xi }_b^0$ decays to $\Lambda h^{+}{h}^{\prime -}$ final states
• Search for the rare decays $B_s^0\to e^{+}{e}^{-}$ and $B^0\to e^{+}{e}^{-}$
• Measurement of the properties of the ${\Xi }_b^{\ast 0}$ baryon
• Search for the doubly heavy ${\Xi }_{bc}^0$ baryon via decays to $D^{0}p{K}^{-}$
• Observation of the doubly charmed baryon decay ${\Xi }_{cc}^{++}\to {\Xi }_c^{{}^{\prime }+}{\pi }^{+}$
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• Studies of the resonance structure in $D^0\to K_S^0{K}^{\pm }{\pi }^{\mp }$ decays
• Search for the rare decay ${\Lambda }_c^{+}\to p{\mu }^{+}{\mu }^{-}$
• Observation of two new excited ${\Xi }_b^0$ states decaying to ${\Lambda }_b^0{K}^{-}{\pi }^{+}$
• Measurement of the $CP$ violation parameter $A_{\Gamma }$ in $D^0\to K^{+}{K}^{-}$ and $D^0\to {\pi }^{+}{\pi }^{-}$ decays
• Measurement of the mass and production rate of ${\Xi }_b^{-}$ baryons
• Observation of new ${\Omega }_c^0$ states decaying to the ${\Xi }_c^{+}{K}^{-}$ final state
• First observation of B0->J/ψK+K- and search for B0->J/ψϕ decays
• Measurement of $f_s/f_u$ variation with proton-proton collision energy and $B$-meson kinematics
• Model-independent search for CP violation in D0 to K-K+pi-pi+ and D0 to pi-pi+pi+pi- decays
• Observation of the decay $B_s^0\to \varphi {\pi }^{+}{\pi }^{-}$ and evidence for $B^0\to \varphi {\pi }^{+}{\pi }^{-}$
• Measurement of the CKM angle γusing B^\pm --> D K^\pm with D-->K_Sπ^+π^-, K_SK^+K^- decays
• Measurements of the branching fractions of $B^{+}\to p\bar{p}{K}^{+}$ decays
• Evidence for the strangeness-changing weak decay ${\Xi }_b^{-}\to {\Lambda }_b^0{\pi }^{-}$
• Observation of ${\Lambda }_b^0\to \psi (2S)p{K}^{-}$ and ${\Lambda }_b^0\to J/\psi {\pi }^{+}{\pi }^{-}p{K}^{-}$ decays and a measurement of the ${\Lambda }_b^0$ baryon mass
• Observation of the annihilation decay mode $B^0\to K^{+}{K}^{-}$
• Precise measurements of the properties of the B_1(5721)^(0,+) and B_2*(5747)^(0,+) states and observation of B^(+,0) pi^(-,+) mass structures
• Observation of a new excited $D_s^{+}$ meson in $B^0\to D^{-}{D}^{+}{K}^{+}{\pi }^{-}$ decays
• Study of $Z$ bosons produced in association with charm in the forward region
• Improved limit on the branching fraction of the rare decay $K_S^0\to {\mu }^{+}{\mu }^{-}$
• Search for time-dependent $CP$ violation in $D^0\to K^{+}{K}^{-}$ and $D^0\to {\pi }^{+}{\pi }^{-}$ decays
• Search for heavy neutral leptons in $W^{+}\to {\mu }^{+}{\mu }^{\pm }\text{jet}$ decays
• Measurement of ${\Xi }_{cc}^{++}$ production in $pp$ collisions at $\sqrt{s}=13$ TeV
• Constraints on the $K_{\mathrm{S}}^0\to {\mu }^{+}{\mu }^{-}$ branching fraction
• Measurement of charged hadron production in $Z$-tagged jets in proton-proton collisions at $\sqrt{s}=8$ TeV
• Observation of the suppressed ADS modes $B^{\pm }\to [{\pi }^{\pm }{K}^{\mp }{\pi }^{+}{\pi }^{-}{]}_D{K}^{\pm }$ and $B^{\pm }\to [{\pi }^{\pm }{K}^{\mp }{\pi }^{+}{\pi }^{-}{]}_D{\pi }^{\pm }$
• Search for the lepton-flavour violating decays $B^{+}\to K^{+}{\mu }^{\pm }{e}^{\mp }$
• First branching fraction measurement of the suppressed decay ${\Xi }_c^0\to {\pi }^{-}{\Lambda }_c^{+}$
• Measurement of the $B^0$--${\bar{B}}^0$ oscillation frequency $\Delta m_d$ with the decays $B^0\to D^{-}{\pi }^{+}$ and $B^0\to J/\psi K^{\ast 0}$
• Observations of $B_s^0\to \psi (2S)\eta$ and $B_{(s)}^0\to \psi (2S){\pi }^{+}{\pi }^{-}$ decays
• Search for $CP$ violation using $T$-odd correlations in $D^0\to K^{+}{K}^{-}{\pi }^{+}{\pi }^{-}$ decays
• Measurement of CP asymmetry in $B_s^0\to D_s^{\mp }{K}^{\pm }$ decays
• Measurement of the ${\Lambda }_b^0\to J/\psi \Lambda$ angular distribution and the ${\Lambda }_b^0$ polarisation in $pp$ collisions
• A study of $CP$ violation in $B^{\mp }\to D{h}^{\mp }$ ($h=K,\pi$) with the modes $D\to K^{\mp }{\pi }^{\pm }{\pi }^0$, $D\to {\pi }^{+}{\pi }^{-}{\pi }^0$ and $D\to K^{+}{K}^{-}{\pi }^0$
• Observation of the suppressed decay ${\Lambda }_b^0\to p{\pi }^{-}{\mu }^{+}{\mu }^{-}$
• A new algorithm for identifying the flavour of $B_s^0$ mesons at LHCb
• Measurement of angular and CP asymmetries in $D^0\to {\pi }^{+}{\pi }^{-}{\mu }^{+}{\mu }^{-}$ and $D^0\to K^{+}{K}^{-}{\mu }^{+}{\mu }^{-}$ decays
• Study of $B_s^0\to J/\psi {\pi }^{+}{\pi }^{-}{K}^{+}{K}^{-}$ decays
• Measurement of polarization amplitudes and CP asymmetries in $B^0\to \varphi K^{\ast }(892{)}^0$
• Study of ${\chi }_b$ meson production in pp collisions at $\sqrt{s}=7$ and 8TeV and observation of the decay ${\chi }_b\to {\rm Y}(3S)\gamma$
• Observation of the decay ${\Lambda }_b^0\to p{K}^{-}{\mu }^{+}{\mu }^{-}$ and a search for $CP$ violation
• First observations of ${\bar{B}}_s^0\to D^{+}{D}^{-}$, $D_s^{+}{D}^{-}$ and $D^0{\bar{D}}^0$ decays
• Measurement of the ${\rm Y}$ polarizations in $pp$ collisions at $\sqrt{s}$=7 and 8TeV
• Observation of the $B^0\to {\rho }^0{\rho }^0$ decay from an amplitude analysis of $B^0\to ({\pi }^{+}{\pi }^{-})({\pi }^{+}{\pi }^{-})$ decays
• Search for the doubly charmed baryon ${\Xi }_{cc}^{+}$ in the ${\Xi }_c^{+}{\pi }^{-}{\pi }^{+}$ final state
• Observation of the ${\Xi }_b^{-}\to J/\psi \Lambda K^{-}$ decay
• First observation of the decay $D^0\to K^{-}{\pi }^{+}{\mu }^{+}{\mu }^{-}$ in the ${\rho }^0$-$\omega$ region of the dimuon mass spectrum
• Measurement of the branching fraction ratio $\mathcal{B}(B_c^{+}\to \psi (2S){\pi }^{+})/\mathcal{B}(B_c^{+}\to J/\psi {\pi }^{+})$
• Measurement of the branching fractions of the decays Bs -> D0bar K- π+ and B0 -> D0bar K+ π-
• Observation of charmonium pairs produced exclusively in $pp$ collisions
• Measurement of $B_s^0$ and $D_s^{-}$ meson lifetimes
• Search for $CP$ violation in ${\Lambda }_b^0\to p{K}^{-}$ and ${\Lambda }_b^0\to p{\pi }^{-}$ decays
• Study of the rare $B_s^0$ and $B^0$ decays into the ${\pi }^{+}{\pi }^{-}{\mu }^{+}{\mu }^{-}$ final state
• Calibration and performance of the LHCb calorimeters in Run 1 and 2 at the LHC
• ${\chi }_{c1}$ and ${\chi }_{c2}$ resonance parameters with the decays ${\chi }_{c1,c2}\to J/\psi {\mu }^{+}{\mu }^{-}$
• Search for rare $B_{(s)}^0\to {\mu }^{+}{\mu }^{-}{\mu }^{+}{\mu }^{-}$ decays
• Measurement of ${\chi }_{c1}(3872)$ production in proton-proton collisions at $\sqrt{s}=8$ and $13$ TeV
• Observation of $B_s^0$-${\bar{B}}_s^0$ mixing and measurement of mixing frequencies using semileptonic B decays
• Measurement of the charm-mixing parameter $y_{CP}$
• First measurement of the charge asymmetry in beauty-quark pair production at a hadron collider
• Updated measurement of decay-time-dependent CP asymmetries in $D^0\to K^{+}{K}^{-}$ and $D^0\to {\pi }^{+}{\pi }^{-}$ decays
• Measurement of the mass and lifetime of the ${\Omega }_b^{-}$ baryon
• New algorithms for identifying the flavour of $B^0$ mesons using pions and protons
• Measurement of the effective B_s^0 -> J/ψ K_S^0 lifetime
• Search for CP violation in D+ -> phi pi+ and Ds+ -> Ks pi+ decays
• Measurement of the ${\bar{B}}_s^0\to D_s^{-}{D}_s^{+}$ and ${\bar{B}}_s^0\to D^{-}{D}_s^{+}$ effective lifetimes
• Measurement of CP violation in the decay $B^{+}\to K^{+}{\pi }^0$
• Measurement of the photon polarization in ${\Lambda }_b\to \Lambda \gamma$ decays
• Measurement of CP violation in $B^0\to \psi (\to {\ell }^{+}{\ell }^{-})K_S^0(\to {\pi }^{+}{\pi }^{-})$ decays
• Amplitude analysis of the decay ${\overline{B}}^0\to K_S^0{\pi }^{+}{\pi }^{-}$ and first observation of the CP asymmetry in ${\overline{B}}^0\to K^{\ast }(892{)}^{-}{\pi }^{+}$
• Measurement of $CP$ asymmetries and polarisation fractions in $B_s^0\to K^{\ast 0}\bar{K}{}^{\ast 0}$ decays
• Studies of the decays $B^{+}\to p\bar{p}{h}^{+}$ and observation of $B^{+}\to \bar{\Lambda }(1520)p$
• Observation of $B_s^0\to {\chi }_{c1}\varphi$ decay and study of $B^0\to {\chi }_{c1,2}{K}^{\ast 0}$ decays
• Measurement of the $B^{\pm }$ production asymmetry and the $CP$ asymmetry in $B^{\pm }\to J/\psi K^{\pm }$ decays
• Limits on neutral Higgs boson production in the forward region in $pp$ collisions at $\sqrt{s}=7$ TeV
• Measurement of CP violation in $B_s^0\to \varphi \varphi$ decays
• Study of $\itΛ_{\it{b}}^\rm{0}$ and $\itΞ_{\it{b}}^\rm{0}$ decays to $\Lambda h^{+}{h}^{{}^{\prime }-}$ and evidence for $CP$ violation in $\itΛ_{\it{b}}^\rm{0}\to\itΛ K^+K^-$ decays
• Study of $B^{-}\to D{K}^{-}{\pi }^{+}{\pi }^{-}$ and $B^{-}\to D{\pi }^{-}{\pi }^{+}{\pi }^{-}$ decays and determination of the CKM angle $\gamma$
• Evidence for the decay $B_c^{+}\to J/\psi 3{\pi }^{+}2{\pi }^{-}$
• First observation of the decay $B_s^0\to \varphi {\bar{K}}^{\ast 0}$
• Measurement of branching fractions of charmless four-body ${\Lambda }_b^0$ and ${\Xi }_b^0$ decays
• Search for the rare decay $B^{+}\to {\mu }^{+}{\mu }^{-}{\mu }^{+}{\nu }_{\mu }$
• Measurement of psi(2S) production cross-sections in proton-proton collisions at 7 and 13 TeV
• Observation of the decay $B_s^0\to {\bar{D}}^0\varphi$
• First evidence for the two-body charmless baryonic decay $B^0\to p\bar{p}$
• Search for $B_c^{+}$ decays to the $p\bar{p}{\pi }^{+}$ final state
• Observation of $B_s^0\to K^{\ast \pm }{K}^{\mp }$ and evidence for $B_s^0\to K^{\ast -}{\pi }^{+}$ decays
• Searches for $B_{(s)}^0\to J/\psi p\overline{p}$ and $B^{+}\to J/\psi p\overline{p}{\pi }^{+}$ decays
• First evidence for the annihilation decay mode $B^{+}\to D_s^{+}\varphi$
• Measurement of CP observables in B0 -> D K*0 with D -> K+ K-
• Open charm production and asymmetry in $p$Ne collisions at $\sqrt{s_{\mathrm{NN}}}=$ 68.5 GeV
• Observation of $B_{(s)}^0\to J/\psi p\overline{p}$ decays and precision measurements of the $B_{(s)}^0$ masses
• Isospin amplitudes in ${\Lambda }_b^0\to J/\psi \Lambda ({\Sigma }^0)$ and ${\Xi }_b^0\to J/\psi {\Xi }^0(\Lambda )$ decays
• Search for long-lived heavy charged particles using a ring imaging Cherenkov technique at LHCb
• Observation of the decay $B_s^0\to {\overline{D}}^0{K}^{+}{K}^{-}$
• Observation of the decay ${\overline{B}}_s^0\to \psi (2S)K^{+}{\pi }^{-}$
• Model-independent measurement of mixing parameters in $D^0\to K_S{\pi }^{+}{\pi }^{-}$ decays
• Measurement of the $B_s^0\to \varphi \varphi$ branching fraction and search for the decay $B^0\to \varphi \varphi$
• Observation of the decay ${\Lambda }_b^0\to {\Lambda }_c^{+}p\overline{p}{\pi }^{-}$
• Measurement of the shape of the $B_s^0\to D_s^{\ast -}{\mu }^{+}{\nu }_{\mu }$ differential decay rate
• Search for $B_c^{+}$ decays to two charm mesons
• Search for $CP$ violation in $D_s^{+}\to K_S^0{\pi }^{+}$, $D^{+}\to K_S^0{K}^{+}$ and $D^{+}\to \varphi {\pi }^{+}$ decays
• Branching fraction and CP asymmetry of the decays $B^{+}\to K_{\mathrm{S}}^0{\pi }^{+}$ and $B^{+}\to K_{\mathrm{S}}^0{K}^{+}$
• Observation of $B_s^0\to {\overline{D}}^{\ast 0}\varphi$ and search for $B^0\to {\overline{D}}^0\varphi$ decays
• Angular analysis of $D^0\to {\pi }^{+}{\pi }^{-}{\mu }^{+}{\mu }^{-}$ and $D^0\to K^{+}{K}^{-}{\mu }^{+}{\mu }^{-}$ decays and search for $CP$ violation
• Study of the $B_c^{+}$ decays into charmonia and three light hadrons
• First observations of the rare decays $B^{+}->K^{+}{\pi }^{+}{\pi }^{-}{\mu }^{+}{\mu }^{-}$ and $B^{+}->\varphi K^{+}{\mu }^{+}{\mu }^{-}$
• First observation of the rare purely baryonic decay $B^0\to p\bar{p}$
• Observation of the ${\Lambda }_b^0\to {\chi }_{c1}(3872)p{K}^{-}$ decay
• Study of B0 -> D*- pi+ pi- pi+ and B0 -> D*- K+ pi- pi+ decays
• Measurement of the branching fraction ratios $R(D^{+})$ and $R(D^{\ast +})$ using muonic $\tau$ decays
• Observation of the decay $B_s^0\to {\eta }_c\varphi$ and evidence for $B_s^0\to {\eta }_c{\pi }^{+}{\pi }^{-}$
• Bose-Einstein correlations of same-sign charged pions in the forward region in $pp$ collisions at $\sqrt{s}$ = 7 TeV
• Measurement of $CP$ observables in $B^{\pm }\to D{K}^{\ast \pm }$ decays using two- and four-body $D$ final states
• Observation of charmless baryonic decays $B_{(s)}^0\to p\overline{p}{h}^{+}{h}^{\prime -}$
• Study of $b\bar{b}$ correlations in high energy proton-proton collisions
• Measurement of antiproton production from antihyperon decays in pHe collisions at $\sqrt{s_{NN}}=110$ GeV
• Measurement of the electron reconstruction efficiency at LHCb
• $J/\psi$ and $D^0$ production in $\sqrt{s_{\mathrm{NN}}}$ = 68.5 GeV PbNe collisions
• Three-dimensional convolutional neural networks for neutrinoless double-beta decay signal/background discrimination in high-pressure gaseous Time Projection Chamber
• First observation of a baryonic $B_s^0$ decay
• The history of LHCb
• Measurement of the $B_s^0\to J/\psi \eta$ lifetime
• Search for the suppressed decays $B^{+}\to K^{+}{K}^{+}{\pi }^{-}$ and $B^{+}\to {\pi }^{+}{\pi }^{+}{K}^{-}$
• Heavy Flavour Physics at the LHC
• Improved measurement of $CP$ violation parameters in $B_s^0\to J/\psi K^{+}{K}^{-}$ decays in the vicinity of the $\varphi (1020)$ resonance
• Observation of the decay ${\Xi }_b^{-}\to p{K}^{-}{K}^{-}$
• Observation of the $B_s^0\to {\eta }^{\prime }{\eta }^{\prime }$ decay
• Study of charmonium decays to $K_S^{0}K\pi$ in the $B\to (K_S^{0}K\pi )K$ channels
• Measurement of $D_s^{\pm }$ production asymmetry in $pp$ collisions at $\sqrt{s}=7$ and 8 TeV
• Measurement of the charge asymmetry in $B^{\pm }\to \varphi K^{\pm }$ and search for $B^{\pm }\to \varphi {\pi }^{\pm }$ decays
• Measurement of the $D^{\ast }$ longitudinal polarization in $B^0\to D^{\ast -}{\tau }^{+}{\nu }_{\tau }$ decays
• Search for the $CP$-violating strong decays $\eta \to {\pi }^{+}{\pi }^{-}$ and ${\eta }^{\prime }(958)\to {\pi }^{+}{\pi }^{-}$
• Measurement of the charm mixing parameter $y_{CP}-y_{CP}^{K\pi }$ using two-body $D^0$ meson decays
• Report of the Quark Flavor Physics Working Group
• Measurement of $CP$ asymmetry in $D^0\to K_S^0{K}_S^0$ decays
• Learning Tree Structures from Leaves For Particle Decay Reconstruction
• Observation of the suppressed ${\Lambda }_b^0\to Dp{K}^{-}$ decay with $D\to K^{+}{\pi }^{-}$ and measurement of its $CP$ asymmetry
• Precision measurement of $CP$ violation in the penguin-mediated decay $B_s^0\to \varphi \varphi$
• Search for the decay Bs -> D*-+ π+-
• Charmonium production in $p$Ne collisions at $\sqrt{s_{\mathrm{NN}}}=68.5$ GeV
• Search for the rare decays $B^0\to J/\psi \gamma$ and $B_s^0\to J/\psi \gamma$
• Measurement of the ${\Lambda }_b^0\to \Lambda (1520){\mu }^{+}{\mu }^{-}$ differential branching fraction
• Robust and Provably Monotonic Networks
• Search for the doubly heavy baryon ${\Xi }_{bc}^{+}$ decaying to $J/\psi {\Xi }_c^{+}$
• Measurement of the relative branching fractions of $B^{+}\to h^{+}{h}^{\prime +}{h}^{\prime -}$ decays
• Measurement of the branching fraction and $CP$ asymmetry in $B^{+}\to J/\psi {\rho }^{+}$ decays
• First observation of the $B^{+}\to D_s^{+}{D}_s^{-}{K}^{+}$ decay
• Study of $D_{s1}(2460{)}^{+}\to D_s^{+}{\pi }^{+}{\pi }^{-}$ in $B\to {\bar{D}}^{(\ast )}{D}_s^{+}{\pi }^{+}{\pi }^{-}$ decays
• Test of lepton flavour universality with $B_s^0\to \varphi {\ell }^{+}{\ell }^{-}$ decays
• Measurement of the branching fraction of the decay $B_s^0\to K_S^0{K}_S^0$
• Search for the rare hadronic decay $B_s^0\to p\bar{p}$
• Measurement of the relative $B^{-}\to D^0/D^{\ast 0}/D^{\ast \ast 0}{\mu }^{-}{\overline{\nu }}_{\mu }$ branching fractions using $B^{-}$ mesons from $\overline{B}{}_{s2}^{\ast 0}$ decays
• Search for prompt production of pentaquarks in charm hadron final states
• Measurement of exclusive $J/\psi$ and $\psi (2S)$ production at $\sqrt{s}=13$ TeV
• Momentum scale calibration of the LHCb spectrometer
• Observation and branching fraction measurement of the decay ${\Xi }_b^{-}\to {\Lambda }_b^0{\pi }^{-}$
• Measurement of the branching fraction of the $B^0\to D_s^{+}{\pi }^{-}$ decay
• Measurement of the ratio of branching fractions and difference in $CP$ asymmetries of the decays $B^{+}\to J/\psi {\pi }^{+}$ and $B^{+}\to J/\psi K^{+}$
• Search for the rare decay of charmed baryon ${\Lambda }_c^{+}$ into $p{\mu }^{+}{\mu }^{-}$ final state
• Observation of the $B_s^0\to J/\psi K_{\mathrm{S}}^0{K}^{\pm }{\pi }^{\mp }$ decay
• Recent advances in charm mixing and $CP$ violation at LHCb
• Search for the rare decays $W^{+}\to D_s^{+}\gamma$ and $Z\to D^0\gamma$ at LHCb
• Deep Learning Level-3 Electron Trigger for CLAS12
• First determination of the spin-parity of ${\Xi }_c(3055{)}^{+,0}$ baryons
• Observation of $B^{+}\to J/\psi 3{\pi }^{+}2{\pi }^{-}$ and $B^{+}\to \psi (2S){\pi }^{+}{\pi }^{+}{\pi }^{-}$ decays
• Search for $D^0$ meson decays to ${\pi }^{+}{\pi }^{-}{e}^{+}{e}^{-}$ and $K^{+}{K}^{-}{e}^{+}{e}^{-}$ final states
• Real-time data analysis at the LHC: present and future
• Measurements of $\psi (2S)$ and ${\chi }_{c1}(3872)$ production within fully reconstructed jets
• Measurement of the $B_s^0\to D_s^{(\ast )+}{D}_s^{(\ast )-}$ branching fractions
• Search for the $B_s^0\to {\eta }^{\prime }\varphi$ decay
• First observation of ${\Lambda }_b^0\to {\Sigma }_c^{(\ast )++}{D}^{(\ast )-}{K}^{-}$ decays
• The upgrade of the LHCb trigger system
• Measurement of ${\Xi }_c^{+}$ production in $p$Pb collisions at $\sqrt{s_{NN}}=8.16$ TeV at LHCb
• Angular analysis of the rare decay $B_s^0\to \varphi {\mu }^{+}{\mu }^{-}$
• Experimental review of the ${\rm Y}(1S,2S,3S)$ physics at $e^{+}{e}^{-}$ colliders and the LHC
• Observation of a new charmed baryon decaying to ${\Xi }_c^{+}{\pi }^{-}{\pi }^{+}$
• Curvature-bias corrections using a pseudomass method
• Measurement of the mass difference and relative production rate of the ${\Omega }_b^{-}$ and ${\Xi }_b^{-}$ baryons
• Observation of the $B^{+}\to D^{\ast -}{K}^{+}{\pi }^{+}$ decay
• Measurement of $D^0-{\overline{D}}^0$ mixing and search for $CP$ violation with $D^0\to K^{+}{\pi }^{-}$ decays
• Study of charmonium production via the decay to $p\bar{p}$ at $\sqrt{s}=13TeV$
• Search for the baryon- and lepton-number violating decays $B^0\to p{\mu }^{-}$ and $B_s^0\to p{\mu }^{-}$
• Long-lived particle reconstruction downstream of the LHCb magnet
• Statistical biases in measurements with multiple candidates
• Observation of the decay $\overline{B_s^0}\to {\chi }_{c2}{K}^{+}{K}^{-}$ in the $\phi$ mass region
• Observation of the ${\Lambda }_b^0\to {\Lambda }_c^{+}{K}^{+}{K}^{-}{\pi }^{-}$ decay
• Evidence for $B^{-}\to D^{\ast \ast 0}{\tau }^{-}\overline{{\nu }_{\tau }}$ decays
• Review of real-time data processing for collider experiments
• First evidence of $CP$ violation in beauty baryon to charmonium decays
• First observation of $CP$ violation and measurement of polarization in $B^{+}\to \rho (770{)}^0{K}^{\ast }(892{)}^{+}$ decays
• First observation of the ${\Lambda }_b^0\to {\Lambda }_c^{+}{D}_s^{-}{K}^{+}{K}^{-}$ decay and search for pentaquarks in the ${\Lambda }_c^{+}{D}_s^{-}$ system
• First measurement of $b$-jet mass with and without grooming
• Observation of the $B^0\to {\overline{D}}^{\ast 0}{K}^{+}{\pi }^{-}$ and $B_s^0\to {\overline{D}}^{\ast 0}{K}^{-}{\pi }^{+}$ decays
• CP violation and CKM studies (and first LHCb Run II results)
• Measurement of $CP$ violation observables in $D^{+}\to K^{-}{K}^{+}{\pi }^{+}$ decays
• Measurement of forward charged hadron flow harmonics in peripheral PbPb collisions at $\sqrt{s_{NN}}=5.02$ TeV with the LHCb detector
• Predicting the Masses of Exotic Hadrons with Data Augmentation Using Multilayer Perceptron
• Measurements of $CP$ asymmetries in charmless four-body ${\Lambda }_b$ and ${\Xi }_b^0$ decays
• Search for $B_c^{+}\to {\pi }^{+}{\mu }^{+}{\mu }^{-}$ decays and measurement of the branching fraction ratio $\mathcal{B}(B_c^{+}\to \psi (2S){\pi }^{+})/\mathcal{B}(B_c^{+}\to J/\psi {\pi }^{+})$
• Study of light-meson resonances decaying to $K_{\mathrm{S}}^{0}K\pi$ in the $B\to (K_{\mathrm{S}}^{0}K\pi )K$ channels
• Observation of the very rare ${\Sigma }^{+}\to p{\mu }^{+}{\mu }^{-}$ decay
• Measurement of the Z-boson mass
• First measurement of time-dependent $CP$ violation in the flavor-changing neutral-current decay $B^0\to K_S^0{\mu }^{+}{\mu }^{-}$
• First observation of the charmless baryonic decay $B^{+}\to \bar{\Lambda }p\bar{p}p$
• Future prospects at LHCb
• First observation of the ${\overline{B}}_s^0\to {\Lambda }_c^{+}{\overline{\Lambda }}_c{}^{-}$ decay and evidence for the ${\overline{B}}^0\to {\Lambda }_c^{+}{\overline{\Lambda }}_c{}^{-}$ decay
• LHCb trigger streams optimization
• Search for $CP$ violation using $\hat{T}$-odd correlations in $B^0\to p\bar{p}{K}^{+}{\pi }^{-}$ decays
• Observation of $CP$ violation in $B^0\to J/\psi \rho (770{)}^0$ decays
• Precision measurement of the ${\Xi }_b^0$ baryon lifetime
• Mixing and CPV in charm hadrons at LHCb
• Measurement of the lifetimes of promptly produced ${\Omega }_c^0$ and ${\Xi }_c^0$ baryons
• Search for $K_{\mathrm{S}(\mathrm{L})}^0\to {\pi }^{+}{\pi }^{-}{\mu }^{+}{\mu }^{-}$ decays at LHCb
• New approaches for boosting to uniformity
• Selection of LHCb results from Run I
• $B$-jet fragmentation with $B^{\pm }\to J/\psi K^{\pm }$ decays in $\sqrt{s}=13$ TeV $pp$ collisions at LHCb
• Search for $B_{(s)}^{\ast 0}\to {\mu }^{+}{\mu }^{-}$ in $B_c^{+}\to {\pi }^{+}{\mu }^{+}{\mu }^{-}$ decays
• Searches for very rare decays to purely leptonic final states at LHCb
• The LHCb prompt charm triggers
• Branching fraction measurement of the decay $B^{+}\to \psi (2S)\varphi (1020)K^{+}$
• What We've Learned from Heavy Flavour Experiments Since CKM2010
• Precision measurement of CP violation and branching fractions in $B^{\pm }\to K_{\mathrm{S}}^0{h}^{\pm }$ $(h=\pi ,K)$ decays and search for the rare decay $B_c^{\pm }\to K_{\mathrm{S}}^0{K}^{\pm }$
• Measurement of the top-quark production cross-section and charge asymmetry at LHCb
• Observation of the rare baryonic decay $B^{+}\to p\bar{\Lambda }$ and measurement of its weak decay parameter