2024-12-06
08:52 |
Detaljnije
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2024-11-19
09:08 |
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; LHCb-PAPER-2024-031; CERN-EP-2024-286; LHCB-PAPER-2024-031.-
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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Detaljnije
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2024-11-15
15:49 |
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 - 21 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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Detaljnije
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2024-10-29
11:56 |
Measurement of the CKM angle $\gamma$ in $B^\pm\to DK(892)^{*\pm}$ decays
/ LHCb Collaboration
Measurements of $CP$ observables and the CKM angle $\gamma$ are performed in $B^{\pm} \to D K^*(892)^{\pm}$ decays, where $D$ represents a superposition of $D^0$ and $\overline{D}{}^0$ states, using the LHCb dataset collected during Run 1 (2011-2012) and Run 2 (2015-2018). A comprehensive study of this channel is presented with the $D$ meson reconstructed in two-body final states $K^{\pm}\pi^{\mp}$, $K^+K^-$ and $\pi^+\pi^-$; four-body final states $K^{\pm}\pi^{\mp}\pi^{\pm}\pi^{\mp}$ and $\pi^+\pi^-\pi^+\pi^-$; and three-body final states $K^0_{S} \pi^+\pi^-$ and $K^0_{S} K^+ K^-$. [...]
arXiv:2410.21115; LHCb-PAPER-2024-023; CERN-EP-2024-260.-
Geneva : CERN, 2025-02-18 - 38 p.
- Published in : JHEP 2502 (2025) 113
Fulltext: LHCb-PAPER-2024-023_arXiv - PDF; 2410.21115 - PDF; document - PDF; Related data file(s): ZIP;
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Detaljnije
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2024-10-04
10:45 |
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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Detaljnije
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2024-09-27
11:23 |
Search for $B_{(s)}^{*0}\to \mu^+\mu^-$ in $B_c^+ \to \pi^+ \mu^+\mu^-$ decays
/ LHCb Collaboration
A search for the very rare $B^{*0}\to\mu^+\mu^-$ and $B_{s}^{*0}\to\mu^+\mu^-$ decays is conducted by analysing the $B_c^+\to \pi^+\mu^+\mu^-$ process. The analysis uses proton-proton collision data collected with the LHCb detector between 2011 and 2018, corresponding to an integrated luminosity of 9 $\text{fb}^{-1}$ [...]
arXiv:2409.17209; CERN-EP-2024-220; LHCb-PAPER-2024-026.-
Geneva : CERN, 2025-01-13 - 16 p.
- Published in : Eur. Phys. J. C 85 (2025) 20
Figures: ZIP; Fulltext: 2409.17209v1 - PDF; 2409.17209 - PDF; document - PDF;
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Detaljnije
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2024-09-20
11:34 |
Analysis of $\it{\Lambda}^\mathrm{0}_b \rightarrow pK^-\mu^+\mu^-$ decays
/ LHCb Collaboration
The differential branching fraction and angular coefficients of ${\it{\Lambda}^\mathrm{0}_b \rightarrow pK^-\mu^+\mu^-}$ decays are measured in bins of the dimuon mass squared and dihadron mass. The analysis is performed using a data set corresponding to 9$fb^-1$ of integrated luminosity collected with the $\mbox{LHCb}$ detector between 2011 and 2018. [...]
arXiv:2409.12629; CERN-EP-2024-212; LHCb-PAPER-2024-024.-
Geneva : CERN, 2024-12-19 - 33 p.
- Published in : JHEP 2412 (2024) 147
Fulltext: 2409.12629v1 - PDF; 2409.12629 - PDF; document - PDF; Related data file(s): ZIP; Supplementary information: ZIP;
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Detaljnije
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2024-09-09
14:28 |
First determination of the spin-parity of ${\Xi}_{c}(3055)^{+0}$ baryons
/ LHCb Collaboration
The ${{\Xi}_{b}^{0(-)}\to{\Xi}_{c}(3055)^{+(0)}(\to D^{+(0)}{\Lambda}){\pi}^{-}}$ decay chains are observed, and the spin-parity of ${\Xi}_{c}(3055)^{+(0)}$ baryons is determined for the first time. The measurement is performed using proton-proton collision data at a center-of-mass energy of $\sqrt{s}=13\,\text{TeV}$, corresponding to an integrated luminosity of $5.4\,\text{fb}^{-1}$, recorded by the $\text{LHCb}$ experiment between 2016 and 2018. [...]
arXiv:2409.05440; LHCb-PAPER-2024-018; CERN-EP-2024-215; LHCB-PAPER-2024-018.-
Geneva : CERN, 2025-02-28 - 24 p.
- Published in : Phys. Rev. Lett. 134 (2025) 081901
Fulltext: final_draft_for_arXiv - PDF; 2409.05440 - PDF; Related data file(s): ZIP; Supplementary information: ZIP;
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Detaljnije
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2024-09-09
10:21 |
Measurement of exclusive $J/\psi$ and $\psi(2S)$ production at $\sqrt{s}=13$ TeV
/ LHCb Collaboration
Measurements are presented of the cross-section for the central exclusive production of $J/\psi\to\mu^+\mu^-$ and $\psi(2S)\to\mu^+\mu^-$ processes in proton-proton collisions at $\sqrt{s} = 13 $ TeV with 2016-2018 data. They are performed by requiring both muons to be in the LHCb acceptance (with pseudorapidity $2<\eta_{\mu^\pm} < 4.5$) and mesons in the rapidity range $2.0 < y < 4.5$. [...]
arXiv:2409.03496; LHCb-PAPER-2024-012; CERN-EP-2024-213.-
Geneva : CERN, 2025-02-26 - 36 p.
- Published in : SciPost Phys. 18 (2025) 071
Fulltext: 2409.03496v1 - PDF; LHCb-PAPER-2024-012-figures - ZIP; 2409.03496 - PDF; LHCb-PAPER-2024-012-supplementary-3 - ZIP; document - PDF;
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Detaljnije
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2024-09-06
14:06 |
Detaljnije
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