LHCb reports the first experimental evidence for the Bs0 to K- pi+ gamma decay with 3.5 sigma significance and measures its branching fraction ratio to the B0 decay in two mass ranges.
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Aaijet al.,LHCb detector performance, Int
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abstract
The LHCb detector is a forward spectrometer at the Large Hadron Collider (LHC) at CERN. The experiment is designed for precision measurements of CP violation and rare decays of beauty and charm hadrons. In this paper the performance of the various LHCb sub-detectors and the trigger system are described, using data taken from 2010 to 2012. It is shown that the design criteria of the experiment have been met. The excellent performance of the detector has allowed the LHCb collaboration to publish a wide range of physics results, demonstrating LHCb's unique role, both as a heavy flavour experiment and as a general purpose detector in the forward region.
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LHCb reports the first upper limits on B0 → K+π−τ+τ− and Bs0 → K+K−τ+τ− branching fractions, with recast limits of 2.8×10−4 on B0 → K*(892)0 τ+τ− at 95% CL that improve prior bounds by an order of magnitude.
First observation of CP violation in B+ to rho(770)^0 K*(892)+ decays with A_CP = 0.507 and longitudinal polarization fraction f_L = 0.720 from 9 fb^-1 of LHCb data.
First evidence for B_s^0 to phi eta-prime decay with relative branching ratio (3.56 ± 0.79 ± 0.18 ± 0.06) x 10^{-2} and absolute branching fraction (0.66 ± 0.15 ± 0.03 ± 0.02) x 10^{-6}.
First observation of Λ_b^0 → Λ p p-bar with 5.1σ significance and relative branching fraction (5.1 ± 1.3(stat) ± 0.3(syst)) × 10^{-2} to the reference mode Λ_b^0 → Λ K^+ K^-.
LHCb observes 3.2 sigma evidence for B+ -> pi+ e+ e- with measured branching fraction (2.4 +0.9 -0.8 +0.4 -0.2) x 10^-8, consistent with Standard Model.
First measurement of A_FB and F_H in B+→π+μ+μ− decay is consistent with Standard Model predictions in both high- and low-mass dimuon regions.
A new charm-strange resonance D_s1(2933)^+ with J^P=1^+ is observed at >10 sigma in B^0 to D+ D- K+ pi- decays, with measured mass 2933 MeV and width 72 MeV.
First prediction of the branching fraction for K*(892) → K ℓ⁺ℓ⁻ and its application to dark photon searches via the dilepton spectrum.
First observation of χ_c1(3872) → J/ψ μ⁺μ⁻ reported at 6.5σ significance with branching fraction ratio (1.68 ± 0.37) × 10^{-3} relative to the π⁺π⁻ mode.
A momentum sum-and-difference analysis separates detector bias sources in two-body decays, enabling a projected Lambda mass measurement at LHCb with 0.7 keV/c² tracking systematics and 2.2 keV/c² total uncertainty.
Differential W to muon neutrino cross-section measurement at 5.02 TeV with proof-of-principle W mass extraction from corrected distributions.
Relative branching fraction B(B0 → Λc+ Λc- KS0)/B(B+ → Λc+ Λc- K+) measured as 0.53 ± 0.05 ± 0.05 with 3.9σ evidence for Ξc(2923)+ and Ξc(2939)+ resonances consistent with isospin partners.
A joint fit to LHCb B to D h decays and BESIII quantum-correlated D Dbar data yields gamma = 71.3 plus or minus 5.0 degrees, the most precise measurement to date.
A novel model-independent approach with per-event phase-space weights on combined BESIII and LHCb data measures the CKM angle γ as (71.3 ± 5.0)° in B± → D(→ K0S h'+h'-) h± decays.
Charged-hadron distributions in heavy-flavor jets differ from light-quark jets in ways consistent with dead-cone suppression and hard fragmentation of the heavy hadron.
No evidence for KS0 or KL0 to pi+ pi- mu+ mu- decays; first upper limits set at 1.4e-9 and 6.6e-7 (90% CL).
R_K*0 is measured as 1.08^{+0.14}_{-0.12}(stat) ± 0.07(syst) for q² > 14 GeV²/c⁴ in B⁰ → K*⁰ ℓ⁺ℓ⁻ decays, consistent with the Standard Model.
No signal observed for B+ → π+ μ± e∓; branching fraction upper limit set at 1.8 × 10^{-9} at 90% CL.
Most precise CP asymmetry and branching ratio measurements for B± → K0S h± decays with no significant signal observed for the rare Bc decay.
First 4D amplitude analysis of B+ → ψ(2S) K_S0 π+ confirms the exotic T_{c c-bar 1}(4430)+ structure with properties consistent with prior observations in the isospin-related channel.
LHCb reports branching fractions B(b→χ_c0,1,2 X) and B(b→η_c(2S)X)×B(η_c(2S)→φφ) plus the most precise η_c(1S) mass from φφ decays in 5.9 fb⁻¹ of data.
LHCb measures f_L^d = 0.600 and f_L^s = 0.159 for B to K* Kbar* decays and reports a ratio L of 4.92 that confirms 4.4 sigma discrepancy with theory.
Branching fraction B(Λ → p μ⁻ ν̄_μ) measured as (1.462 ± 0.016 ± 0.100 ± 0.011) × 10^{-4}, improving prior precision by a factor of two and yielding R^{μe} = 0.175 ± 0.012 consistent with the Standard Model.
citing papers explorer
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First evidence of the $B_s^0\rightarrow K^-\pi^+\gamma$ decay
LHCb reports the first experimental evidence for the Bs0 to K- pi+ gamma decay with 3.5 sigma significance and measures its branching fraction ratio to the B0 decay in two mass ranges.
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Searches for $B^0\to K^+\pi^-\tau^+\tau^-$ and $B_s^0\to K^+K^-\tau^+\tau^-$ decays
LHCb reports the first upper limits on B0 → K+π−τ+τ− and Bs0 → K+K−τ+τ− branching fractions, with recast limits of 2.8×10−4 on B0 → K*(892)0 τ+τ− at 95% CL that improve prior bounds by an order of magnitude.
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First observation of $CP$ violation and measurement of polarization in $B^+\to\rho(770)^0 K^*(892)^+$ decays
First observation of CP violation in B+ to rho(770)^0 K*(892)+ decays with A_CP = 0.507 and longitudinal polarization fraction f_L = 0.720 from 9 fb^-1 of LHCb data.
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Evidence for the decay $B^0_s\to\phi\eta'$
First evidence for B_s^0 to phi eta-prime decay with relative branching ratio (3.56 ± 0.79 ± 0.18 ± 0.06) x 10^{-2} and absolute branching fraction (0.66 ± 0.15 ± 0.03 ± 0.02) x 10^{-6}.
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Observation of the charmless purely baryonic decay $\mathinner{\mathit{\Lambda}^0_b\!\to \mathit{\Lambda} p \overline{p}}$
First observation of Λ_b^0 → Λ p p-bar with 5.1σ significance and relative branching fraction (5.1 ± 1.3(stat) ± 0.3(syst)) × 10^{-2} to the reference mode Λ_b^0 → Λ K^+ K^-.
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First evidence of the decay $B^+\to\pi^+ e^+ e^-$
LHCb observes 3.2 sigma evidence for B+ -> pi+ e+ e- with measured branching fraction (2.4 +0.9 -0.8 +0.4 -0.2) x 10^-8, consistent with Standard Model.
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Angular analysis of the $B^+\to\pi^+\mu^+\mu^-$ decay
First measurement of A_FB and F_H in B+→π+μ+μ− decay is consistent with Standard Model predictions in both high- and low-mass dimuon regions.
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Observation of a new excited charm-strange meson $D_{s1}(2933)^+$ in $B^0\to D^+ D^- K^+ \pi^-$ decays
A new charm-strange resonance D_s1(2933)^+ with J^P=1^+ is observed at >10 sigma in B^0 to D+ D- K+ pi- decays, with measured mass 2933 MeV and width 72 MeV.
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Dalitz decay of $K^*(892) \rightarrow K \ell^+\ell^-$: A New Probe for Hadronic Structure and Dark Photon Searches
First prediction of the branching fraction for K*(892) → K ℓ⁺ℓ⁻ and its application to dark photon searches via the dilepton spectrum.
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Observation of the decay $\chi_{c1}(3872)\rightarrow J\mskip -3mu/\mskip -2mu\psi \mu^+\mu^-$
First observation of χ_c1(3872) → J/ψ μ⁺μ⁻ reported at 6.5σ significance with branching fraction ratio (1.68 ± 0.37) × 10^{-3} relative to the π⁺π⁻ mode.
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Improving systematic uncertainties on precision two-body mass measurements
A momentum sum-and-difference analysis separates detector bias sources in two-body decays, enabling a projected Lambda mass measurement at LHCb with 0.7 keV/c² tracking systematics and 2.2 keV/c² total uncertainty.
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Measurement of the $W \to \mu \nu_\mu$ cross-sections as a function of the muon transverse momentum in $pp$ collisions at 5.02 TeV
Differential W to muon neutrino cross-section measurement at 5.02 TeV with proof-of-principle W mass extraction from corrected distributions.
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Study of the $B^0 \to \Lambda_c^+ \bar{\Lambda}_c^- K_S^0$ decay
Relative branching fraction B(B0 → Λc+ Λc- KS0)/B(B+ → Λc+ Λc- K+) measured as 0.53 ± 0.05 ± 0.05 with 3.9σ evidence for Ξc(2923)+ and Ξc(2939)+ resonances consistent with isospin partners.
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Precise measurement of the CKM angle $\gamma$ with a novel approach
A joint fit to LHCb B to D h decays and BESIII quantum-correlated D Dbar data yields gamma = 71.3 plus or minus 5.0 degrees, the most precise measurement to date.
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Measurement of the CKM angle $\gamma$ in $B^{\pm} \rightarrow D(\rightarrow K^{0}_{\rm S} h^{\prime+}h^{\prime-})h^{\pm}$ decays with a novel approach
A novel model-independent approach with per-event phase-space weights on combined BESIII and LHCb data measures the CKM angle γ as (71.3 ± 5.0)° in B± → D(→ K0S h'+h'-) h± decays.
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Measurement of charged-hadron distributions in heavy-flavor jets in proton-proton collisions at $\sqrt{s}$=13 TeV
Charged-hadron distributions in heavy-flavor jets differ from light-quark jets in ways consistent with dead-cone suppression and hard fragmentation of the heavy hadron.
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Search for $K_{\mathrm{S(L)}}^{0} \rightarrow \pi^{+}\pi^{-}\mu^{+}\mu^{-}$ decays at LHCb
No evidence for KS0 or KL0 to pi+ pi- mu+ mu- decays; first upper limits set at 1.4e-9 and 6.6e-7 (90% CL).
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Test of lepton flavour universality with $B^0\to K^{*0}\ell^+\ell^-$ decays at large dilepton invariant mass
R_K*0 is measured as 1.08^{+0.14}_{-0.12}(stat) ± 0.07(syst) for q² > 14 GeV²/c⁴ in B⁰ → K*⁰ ℓ⁺ℓ⁻ decays, consistent with the Standard Model.
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Search for the lepton-flavour violating decays $B^+ \to \pi^+ \mu^\pm e^\mp$
No signal observed for B+ → π+ μ± e∓; branching fraction upper limit set at 1.8 × 10^{-9} at 90% CL.
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Precision measurement of CP violation and branching fractions in $B^{\pm} \to K^0_{\mathrm{S}} h^{\pm}$ $(h = \pi, K)$ decays and search for the rare decay $B_c^{\pm} \to K^0_{\mathrm{S}} K^{\pm}$
Most precise CP asymmetry and branching ratio measurements for B± → K0S h± decays with no significant signal observed for the rare Bc decay.
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Observation and investigation of the $T_{c\bar{c}1}(4430)^{+}$ structure in $B^{+} \to \psi(2S) K_{\text{S}}^{0} \pi^{+}$ decays
First 4D amplitude analysis of B+ → ψ(2S) K_S0 π+ confirms the exotic T_{c c-bar 1}(4430)+ structure with properties consistent with prior observations in the isospin-related channel.
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Measurement of inclusive production of charmonium states in $b$-hadron decays via their decay into $\phi \phi$
LHCb reports branching fractions B(b→χ_c0,1,2 X) and B(b→η_c(2S)X)×B(η_c(2S)→φφ) plus the most precise η_c(1S) mass from φφ decays in 5.9 fb⁻¹ of data.
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Measurement of the branching fractions and longitudinal polarisations of $B^0_{(s)} \to K^{*0} \kern 0.18em \overline{\kern -0.18em K}{}^{*0}$ decays
LHCb measures f_L^d = 0.600 and f_L^s = 0.159 for B to K* Kbar* decays and reports a ratio L of 4.92 that confirms 4.4 sigma discrepancy with theory.
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Branching fraction measurement of the $\mathit{\Lambda} \to p \mu^- \overline{\nu}_{\mu}$ decay
Branching fraction B(Λ → p μ⁻ ν̄_μ) measured as (1.462 ± 0.016 ± 0.100 ± 0.011) × 10^{-4}, improving prior precision by a factor of two and yielding R^{μe} = 0.175 ± 0.012 consistent with the Standard Model.
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Towards a W boson mass measurement with LHCb
Proposes a new approach to reduce PDF uncertainty by a factor of two in an LHCb W boson mass measurement with Run 2 data.
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$C\!P$ violation analysis of local and nonlocal amplitudes in the $\overline{B}^0 \to \overline{K}^{*0}\mu^+\mu^-$ decay
LHCb measures CP-violating Wilson coefficients in B0 -> K*0 mu+ mu- with higher precision than before and finds results consistent with the Standard Model.
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Measurement of the $W$-boson production cross-sections in $pp$ collisions at $\sqrt{s}$ = 13 TeV in the forward region
LHCb measures forward W+ and W- production cross-sections of 1754.2 pb and 1178.1 pb at 13 TeV, agreeing with NNLO QCD predictions at higher precision than prior results.
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Precision measurement of the muon charge asymmetry from $W$-boson decays in $pp$ collisions at $\sqrt{s}$ = 13 TeV in the forward region
Muon charge asymmetry from W decays is measured with highest precision in the forward region at 13 TeV and agrees with NNLO pQCD.
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Investigating New Physics through the Observables of Semileptonic $B_{s}\to K^{\ast}(\to K \pi)\mu^{+}\mu^{-}$ Decay
Model-independent calculation of differential branching ratio, forward-backward asymmetry, polarization, and angular coefficients in Bs → K* μ+μ- with 1D and 2D new physics scenarios in C7^NP, C9^(prime)NP, and C10^(prime)NP showing deviations from SM.
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Review of experimental studies of charmed meson decays at BESIII
A review of BESIII charmed meson decay studies presents the most precise averages for |V_cs|, |V_cd|, D and D_s decay constants, and several hadronic form factors from combined experimental results.
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Search for the decays $B_{(s)}^0\to J/\psi\gamma$ at LHCb
Upper limits of 2.9×10^{-6} for B_s^0 and 2.5×10^{-6} for B^0 on the branching fractions to J/ψγ at 90% CL, with the B_s limit improved by a factor of 2.5.