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Quantifying the performance of decoding algorithms using Graphic Processing Units for the RICH subdetector at LHCb
/ Ruzicka, Josef (Unlisted, CR) ; Asch, Christian (Unlisted, CR) ; Arguedas-Cuendis, Sergio (Unlisted, CR) ; Mariani, Saverio (CERN) ; Jones, Christopher Robert (Cambridge U.) ; Meneses, Esteban (Unlisted, CR)
The Large Hadron Collider (LHC) located at the European Organization for Nuclear Research (CERN) is the largest accelerator in the world, where proton-proton collisions take place at the as-of-today highest energy ever reached. The Large Hadron Collider beauty (LHCb) experiment is located at one of the LHC interaction points, and its detector and readout electronics are currently able to cope with the 40 MHz bunch crossing rate, corresponding to 4 TB/s. [...]
2024 - 6 p.
- Published in : 10.1109/CONCAPAN63470.2024.10933857
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Observation of $B_c^+ \to D h^+ h^-$ decays
/ LHCb Collaboration
Searches are presented for $B_{c}^{+} \to D h^+ h^-$ decays, where $D$ is a charmed meson and $h^{\pm}$ is a charged pion or kaon, using $pp$ collision data collected by the LHCb experiment corresponding to an integrated luminosity of $9~\text{fb}^{-1}$. [...]
arXiv:2509.15873 ; LHCb-PAPER-2025-028 ; CERN-EP-2025-177.
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Amplitude analysis of $B^0 \rightarrow \eta_c(1S) K^+ \pi^- $ decays
/ LHCb Collaboration
An amplitude analysis of the $B^0 \rightarrow \eta_c(1S) K^+ \pi^-$ decays with $\eta_c(1S)\rightarrow p\bar{p} $ is performed using a sample corresponding to an integrated luminosity of 9$\text{fb}^{-1}$ of $pp$ collision data collected by the LHCb detector at centre-of-mass energies of $\sqrt{s}=$7, 8 and 13TeV. [...]
arXiv:2509.03133 ; LHCb-PAPER-2025-027 ; CERN-EP-2025-185 ; LHCB-PAPER-2025-027.
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2025 - 32.
Fulltext - Related data file(s) - Fulltext
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Luminosity measurement with the LHCb RICH detectors in Run 3
/ Alvarez Cartelle, P. (Cambridge U.) ; Anelli, A. (INFN, Milan Bicocca ; CERN ; Milan Bicocca U. (main)) ; Balboni, A. (INFN, Ferrara) ; Beck, A. (MIT) ; Betti, F. (Edinburgh U.) ; Bex, J. (Cambridge U.) ; Borgato, F. (INFN, Padua ; CERN) ; Calabrese, R. (INFN, Ferrara ; U. Ferrara (main)) ; Calvi, M. (INFN, Milan Bicocca ; Milan Bicocca U. (main)) ; Cardinale, R. (INFN, Genoa ; U. Genoa) et al.
The LHCb Ring-Imaging Cherenkov detectors are built to provide charged hadron identification over a large range of momentum. The upgraded detectors are also capable of providing an independent measurement of the luminosity for the LHCb experiment during LHC Run 3. [...]
arXiv:2503.05273; CERN-LHCb-DP-2024-003.-
2025-08-01 - 21 p.
- Published in : JINST 20 (2025) P08001
Fulltext: 2503.05273 - PDF; document - PDF; document,pdf - PDF;
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First evidence for direct $CP$ violation in beauty to charmonium decays
/ LHCb Collaboration
The $CP$ asymmetry and branching fraction of the CKM-suppressed decay $B^+ \to J\psi \pi^+$ are precisely measured relative to the favoured decay $B^+ \to J\psi K^+$, using a sample of proton-proton collision data corresponding to an integrated luminosity of $5.4 \ \text{fb}^{-1}$ recorded at center-of-mass energy of $13\ \text{TeV}$ during 2016-2018. The results of the $CP$ asymmetry difference and branching fraction ratio are \begin{align*} \Delta\mathcal{A}^{C\!P} &\equiv \mathcal{A}^{C\!P}({B}^+ \to {J}\mskip -3mu/\mskip -2mu\psi\,\pi^+) - \mathcal{A}^{C\!P}({B}^+ \to {J}\mskip -3mu/\mskip -2mu\psi\,K^+) = (1.29 \pm 0.49 \pm 0.08) \times 10^{-2}, \end{align*} \begin{equation*} \mathcal{R}_{\pi/K} \equiv \frac{\mathcal{B}(B^+ \!\to J\mskip -3mu/\mskip -2mu\psi\,\pi^+)} {\mathcal{B}(B^+ \!\to J\mskip -3mu/\mskip -2mu\psi\,K^+)} = (3.852 \pm 0.022 \pm 0.018) \times 10^{-2}. [...]
arXiv:2411.12178; LHCb-PAPER-2024-031; CERN-EP-2024-286.-
Geneva : CERN, 2025-03-12 - 20 p.
- Published in : Phys. Rev. Lett. 134 (2025) 101801
Fulltext: paper_2024_B2JpsiPi - PDF; 2411.12178 - PDF; Related data file(s): ZIP; Supplementary information: ZIP;
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Constraints on the photon polarisation in $b \to s \gamma$ transitions using $B_s^0\to \phi e^+ e^-$ decays
/ LHCb Collaboration
An angular analysis of the $B_s^0 \rightarrow \phi e^+e^-$ decay is performed using the proton-proton collision dataset collected between 2011 and 2018 by the LHCb experiment, corresponding to an integrated luminosity of $9\,{\rm fb}^{-1}$ at centre-of-mass energies of 7, 8 and $13\,{\rm TeV}$. The analysis is performed in the very low dielectron invariant mass-squared region between $0.0009$ and $0.2615\,{\rm GeV}^2\!/c^4$. [...]
arXiv:2411.10219; LHCb-PAPER-2024-030; CERN-EP-2024-276.-
Geneva : CERN, 2025-03-07 - 22 p.
- Published in : JHEP 2503 (2025) 047
Fulltext: LHCb-PAPER-2024-030_Arxiv - PDF; 2411.10219 - PDF; document - PDF; LHCb-LHCb-PAPER-2024-030-figures - ZIP; Related data file(s): ZIP; Supplementary information: ZIP;
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Measurement of the effective leptonic weak mixing angle
/ LHCb Collaboration
Using $pp$ collision data at $\sqrt{s}=13$~TeV, recorded by the LHCb experiment between 2016 and 2018 and corresponding to an integrated luminosity of $5.4$~fb$^{-1}$, the forward-backward asymmetry in the $pp \to Z/\gamma^{*} \to \mu^+\mu^-$ process is measured. The measurement is carried out in ten intervals of the difference between the muon pseudorapidities, within a fiducial region covering dimuon masses between $66$ and $116$ GeV, muon pseudorapidities between $2.0$ and $4.5$ and muon transverse momenta above $20$ GeV. [...]
arXiv:2410.02502; LHCb-PAPER-2024-028; CERN-EP-2024-230.-
Geneva : CERN, 2024-12-03 - 28 p.
- Published in : JHEP 2412 (2024) 026
Fulltext: LHCb-PAPER-2024-028 - PDF; 2410.02502 - PDF; document - PDF; Related data file(s): ZIP; Supplementary information: LHCb-PAPER-2024-028-supplementary - ZIP; supplementary (3) - PDF;
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Amplitude analysis of the radiative decay $B^0_s\to K^+K^-\gamma$
/ LHCb Collaboration
A search for radiative decay of $B^0_s$ mesons to orbitally excited $K^+K^-$ states is performed using proton proton collisions recorded by the \mbox{LHCb}\xspace experiment, corresponding to an integrated luminosity of 9 fb$^{-1}$. The dikaon spectrum in the mass range $m_{KK}<2400\ \text{MeV/}c^2$ is dominated by the $\phi(1020)$ resonance that accounts for almost 70$\%$ of the decay rate. [...]
arXiv:2406.00235; LHCb-PAPER-2024-002; CERN-EP-2024-115; LHCB-PAPER-2024-002.-
Geneva : CERN, 2024-08-13 - 39 p.
- Published in : 10.1007/JHEP08(2024)093
Fulltext: LHCb-PAPER-2024-002_arxiv - PDF; 2406.00235 - PDF; document - PDF; Related data file(s): ZIP; Supplementary information: ZIP;
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Transverse polarization measurement of Λ hyperons in pNe collisions at $ \sqrt{{\textrm{s}}_{\textrm{NN}}} $ = 68.4 GeV with the LHCb detector
/ LHCb Collaboration
A measurement of the transverse polarization of the $\Lambda$ and $\bar{\Lambda}$hyperons in $p$Ne fixed-target collisions at $\sqrt{s_{NN}}$=68.4 GeV is presented using data collected by the LHCb detector. The polarization is studied using the decay $\Lambda \rightarrow p \pi^-$ together with its charge conjugated process, the integrated values measured are $$ P_{\Lambda} = 0.029 \pm 0.019 \, (\rm{stat}) \pm 0.012 \, (\rm{syst}) \, , $$ $$ P_{\bar{\Lambda}} = 0.003 \pm 0.023 \, (\rm{stat}) \pm 0.014 \,(\rm{syst}) \, $$ Furthermore, the results are shown as a function of the Feynman $x$ variable, transverse momentum, pseudorapidity and rapidity of the hyperons, and are compared with previous measurements..
arXiv:2405.11324; CERN-EP-2024-121; LHCb-PAPER-2024-009.-
Geneva : CERN, 2024-09-17 - 18 p.
- Published in : JHEP 2409 (2024) 082
Fulltext: LHCb-PAPER-2024-009 - PDF; 2405.11324 - PDF; document - PDF; Related data file(s): ZIP;
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Search for the $B_s^0 \rightarrow \mu^+\mu^-\gamma$ decay
/ LHCb Collaboration
A search for the fully reconstructed $B_s^0 \rightarrow \mu^+\mu^-\gamma$ decay is performed at the LHCb experiment using proton-proton collisions at $\sqrt{s}=13$ TeV corresponding to an integrated luminosity of $5.4\,\mathrm{fb^{-1}}$. No significant signal is found and upper limits on the branching fraction in intervals of the dimuon mass are set \begin{align} {\cal B}(B_s^0 \rightarrow \mu^+\mu^-\gamma) < 4.2\times10^{-8},~&m;(\mu\mu)\in[2m_\mu,~1.70]\,\mathrm{GeV/c^2} ,\nonumber {\cal B}(B_s^0 \rightarrow \mu^+\mu^-\gamma) < 7.7\times10^{-8},~&m;(\mu\mu)\in[1.70,~2.88]\,\mathrm{GeV/c^2},\nonumber {\cal B}(B_s^0 \rightarrow \mu^+\mu^-\gamma) < 4.2\times10^{-8},~&m;(\mu\mu)\in[3.92 ,~m_{B_s^0}]\,\mathrm{GeV/c^2},\nonumber \end{align} at 95% confidence level. [...]
arXiv:2404.03375; LHCb-PAPER-2023-045; CERN-EP-2024-065.-
2024-07-11 - 28 p.
- Published in : JHEP 2407 (2024) 101
Fulltext: 2404.03375 - PDF; document - PDF;
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