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Search for time-dependent $CP$ violation in $D^0 \to K^+ K^-$ and $D^0 \to \pi^+ \pi^-$ decays / LHCb Collaboration
A search for time-dependent violation of the charge-parity symmetry in $D^0 \to K^+ K^-$ and $D^0 \to \pi^+ \pi^-$ decays is performed at the LHCb experiment using proton-proton collision data recorded from 2015 to 2018 at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 6 fb$^{-1}$. The $D^0$ meson is required to originate from a $D^*(2010)^+ \to D^0 \pi^+$ decay, such that its flavour at production is identified by the charge of the accompanying pion. [...]
arXiv:2105.09889; LHCb-PAPER-2020-045; CERN-EP-2021-060; LHCB-PAPER-2020-045.- Geneva : CERN, 2021-10-01 - 39 p. - Published in : Phys. Rev. D 104 (2021) 072010 Fulltext: 2105.09889 - PDF; LHCb-PAPER-2020-045 - PDF; Fulltext from publisher: PDF; Related data file(s): ZIP; Supplementary information: ZIP;

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Measurement of $CP$ asymmetry in $D^0 \to K^0_S K^0_S$ decays / LHCb Collaboration
A measurement of the $CP$ asymmetry in $D^0 \to K^0_S K^0_S$ decays is reported, based on a data sample of proton-proton collisions collected by the LHCb experiment from 2015 to 2018, corresponding to an integrated luminosity of 6 fb$^{-1}$. The flavor of the $D^0$ candidate is determined using the charge of the $D^{*\pm}$ meson, from which the decay is required to originate. [...]
arXiv:2105.01565; LHCb-PAPER-2020-047; CERN-EP-2021-058; LHCB-PAPER-2020-047.- Geneva : CERN, 2021-08-01 - 11 p. - Published in : Phys. Rev. D 104 (2021) L031102 Fulltext: LHCb-PAPER-2020-047 - PDF; 2105.01565 - PDF; Fulltext from publisher: PDF; Related data file(s): ZIP; Supplementary information: ZIP;

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A parametrized Kalman filter for fast track fitting at LHCb / Billoir, Pierre (Paris U., VI-VII) ; De Cian, Michel (Ecole Polytechnique, Lausanne) ; Günther, Paul André (Heidelberg U.) ; Stemmle, Simon (Heidelberg U.)
We present an alternative implementation of the Kalman filter employed for track fitting within the LHCb experiment. It uses simple parametrizations for the extrapolation of particle trajectories in the field of the LHCb dipole magnet and for the effects of multiple scattering in the detector material. [...]
arXiv:2101.12040; LHCb-DP-2021-001.- 2021-08 - 7 p. - Published in : Comput. Phys. Commun. 265 (2021) 108026 Fulltext: PDF; Fulltext from publisher: PDF; Related data file(s): ZIP;

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Precise measurement of the $f_s/f_d$ ratio of fragmentation fractions and of $B^0_s$ decay branching fractions / LHCb Collaboration
The ratio of the $B^0_s$ and $B^0$ fragmentation fractions, $f_s/f_d$, in proton-proton collisions at the LHC, is obtained as a function of $B$-meson transverse momentum and collision centre-of-mass energy from the combined analysis of different $B$-decay channels measured by the LHCb experiment. The results are described by a linear function of the meson transverse momentum, or with a function inspired by Tsallis statistics. [...]
arXiv:2103.06810; LHCb-PAPER-2020-046; CERN-EP-2021-027; LHCB-PAPER-2020-046.- 2021-08-01 - 33 p. - Published in : Phys. Rev. D 104 (2021) 032005 Fulltext: PDF; Related data file(s): ZIP;

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Spectroscopy in Beauty Decays at the LHCb Experiment / LHCb Collaboration
The beauty hadron decays is unique laboratory to study charmonium and charmonium-like states, such as the $\chi_{c1}(3872)$ meson, other exotic states and the tensor $D$-wave $\Psi_2(3823)$ states. However the nature of many exotic charmonium-like candidates are still unknown. [...]
arXiv:2103.04453; LHCb-PROC-2021-006; CERN-LHCb-PROC-2021-006; CERN-LHCb-PROC-2021-006.- Geneva : CERN, 2021 - 7 p. - Published in : Acta Phys. Pol. B 52 (2021) 1047 Fulltext: document - PDF; 2103.04453 - PDF; LHCb-PROC-2021-006 - PDF;
In : XXVII Cracow Epiphany Conference on Future of particle physics (Epiphany2021), Online, Poland, 7 - 10 Jan 2021, pp.1047

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Observation of new resonances decaying to $J/ \psi K^{+}$and $J \psi\phi$ / LHCb Collaboration
The first observation of exotic states with a new quark content ccus decaying to the $J/\psi K^{+}$ final state is reported with high significance from an amplitude analysis of the $B^{+} \to J/\psi \phi K^{+} $ decay. The analysis is carried out using proton-proton collision data corresponding to a total integrated luminosity of $9{\rm{fb}^{-1}}$ collected by the LHCb experiment at centre-of-mass energies of 7, 8 and $\rm{TeV}$ . [...]
arXiv:2103.01803; LHCb-PAPER-2020-044; CERN-EP-2021-025; LHCB-PAPER-2020-044.- Geneva : CERN, 2021-08-17 - 18 p. - Published in : Phys. Rev. Lett. 126 (2021) 122002 Fulltext: 2103.01803 - PDF; LHCb-PAPER-2020-044 - PDF; Related data file(s): ZIP; External links: Additional information for the analysis; Previous draft version

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Angular Analysis of the $B^{+}\rightarrow K^{\ast+}\mu^{+}\mu^{-}$ Decay / LHCb Collaboration
We present an angular analysis of the $B^{+}\rightarrow K^{\ast+}(\rightarrow K_{S}^{0}\pi^{+})\mu^{+}\mu^{-}$ decay using 9$\,\mbox{fb}^{-1}$ of $pp$ collision data collected with the LHCb experiment. For the first time, the full set of CP-averaged angular observables is measured in intervals of the dimuon invariant mass squared. [...]
arXiv:2012.13241; LHCb-PAPER-2020-041; CERN-EP-2020-239.- 2021-04-23 - 11 p. - Published in : Phys. Rev. Lett. 126 (2021) 161802 Article from SCOAP3: PDF; Fulltext: PDF; Fulltext from Publisher: PDF; Related data file(s): ZIP; Supplementary information: ZIP;

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Observation of the $B_s^0 \rightarrow D^{\ast \pm} D^{\mp}$ decay / LHCb Collaboration
A search for the $B^0_s \!\rightarrow D^{*\pm} D^\mp$ decay is performed using proton-proton collision data at centre-of-mass energies of $7$, $8$ and $13\,\text{TeV}$ collected by the LHCb experiment, corresponding to an integrated luminosity of $9\,\text{fb}^{-1}$. The decay is observed with a high significance and its branching fraction relative to the $B^0 \!\rightarrow D^{*\pm} D^\mp$ decay is measured to be \begin{align*} \frac{\mathcal{B}(B_s^0 \rightarrow D^{\ast \pm} D^{\mp}) }{\mathcal{B}(B^0 \rightarrow D^{\ast \pm} D^{\mp}) } = 0.137 \pm 0.017 \pm 0.002 \pm 0.006 \,, \end{align*} where the first uncertainty is statistical, the second systematic and the third is due to the uncertainty on the ratio of the $B_s^0$ and $B^0$ hadronisation fractions..
arXiv:2012.11341; LHCb-PAPER-2020-037; CERN-EP-2020-230.- 2021-03-09 - 19 p. - Published in : JHEP 2103 (2021) 099 Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP; Supplementary information: ZIP;

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Measurement of CP violation in the decay $B^{+} \rightarrow K^{+} \pi^{0}$ / LHCb Collaboration
A measurement of direct CP violation in the decay $B^{+} \rightarrow K^{+} \pi^{0}$ is reported using a data sample corresponding to an integrated luminosity of 5.4 $\textrm{fb}^{-1}$, collected with the LHCb experiment at a center-of-mass energy of $\sqrt{s}=13$ TeV. The CP asymmetry is measured to be $0.025 \pm 0.015 \pm 0.006 \pm 0.003$, where the uncertainties are statistical, systematic, and due to an external input, respectively. [...]
arXiv:2012.12789; LHCb-PAPER-2020-040; CERN-EP-2020-242.- 2021-03-02 - 11 p. - Published in : Phys. Rev. Lett. 126 (2021) 091802 Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP; supplementary information: ZIP;

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Evidence of a $J/\psi\Lambda$ structure and observation of excited $\Xi^-$ states in the $\Xi^-_b \to J/\psi\Lambda K^-$ decay / LHCb Collaboration
First evidence of a structure in the $J/\psi \varLambda$ invariant mass distribution is obtained from an amplitude analysis of $\varXi_b^- \to J/\psi \varLambda K^-$ decays. The observed structure is consistent with being due to a charmonium pentaquark with strangeness. [...]
arXiv:2012.10380; LHCb-PAPER-2020-039; CERN-EP-2020-233.- 2021-07-15 - 21 p. - Published in : Sci. Bull. 66 (2021) 1278-1287 Fulltext: PDF; Fulltext from publisher: PDF; Related data file(s): ZIP; Supplementary information: ZIP;

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1	Stemmle, S
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