2025-02-10
10:32 |
Measurement of the multiplicity dependence of $\mitΥ$ production ratios in $pp$ collisions at $\sqrt{s}=13$ TeV
/ LHCb Collaboration
The $\mit{\Upsilon}(\mathrm{2}S)$ and $\mit{\Upsilon}(\mathrm{3}S)$ production cross-sections are measured relative to that of the $\mit{\Upsilon}(\mathrm{1}S)$ meson, as a function of charged-particle multiplicity in proton-proton collisions at a centre-of-mass energy of $13$ TeV. The measurement uses data collected by the LHCb experiment in 2018 corresponding to an integrated luminosity of 2 $\text{fb}^{-1}$. [...]
arXiv:2501.12611; LHCb-PAPER-2024-038; CERN-EP-2024-318; LHCB-PAPER-2024-038.-
Geneva : CERN, 2025 - 24 p.
- Published in : JHEP 2505 (2025) 011
Fulltext: LHCb_PAPER_2024_038 - PDF; 2501.12611 - PDF; document - PDF; Related data file(s): ZIP;
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2025-01-22
11:44 |
Search for charge-parity violation in semileptonically tagged $D^{0} \to K^{+} \pi^{-}$ decays
/ LHCb Collaboration
An analysis of the flavour oscillations of the charmed neutral meson is presented. The ratio of ${D^{0} \to K^{+} \pi^{-}}$ and ${D^{0} \to K^{-} \pi^{+}}$ decay rates is measured as a function of the decay time of the $D^{0}$ meson and compared with the charge-conjugated system to search for charge-parity violation. [...]
arXiv:2501.11635; LHCb-PAPER-2024-044; CERN-EP-2024-319; LHCB-PAPER-2024-044.-
Geneva : CERN, 2025-03-19 - 30 p.
- Published in : JHEP 2503 (2025) 149
Fulltext: lhcb-paper-2024-044-arxiv - PDF; 2501.11635 - PDF; document - PDF; Related data file(s): ZIP;
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2024-12-19
09:00 |
Measurement of $C\!P$ asymmetries in $\Lambda_b^0\to ph^-$ decays
/ LHCb Collaboration
A search for $CP$ violation in $\Lambda_b^0\rightarrow pK^-$ and $\Lambda_b^0\rightarrow p\pi^-$ decays is presented using the full Run 1 and Run 2 data samples of $pp$ collisions collected with the LHCb detector, corresponding to an integrated luminosity of 9 $\mathrm{fb}^{-1}$ at center-of-mass energies of 7, 8, and 13 TeV. For the Run 2 data sample, the $CP$-violating asymmetries are measured to be $A_{CP}^{pK^-} = (-1.4 \pm 0.7 \pm 0.4)\%$ and $A_{CP}^{p\pi^-} = (0.4 \pm 0.9 \pm 0.4)\%$, where the first uncertainty is statistical and the second is systematic. [...]
arXiv:2412.13958; LHCb-PAPER-2024-048; CERN-EP-2024-330; LHCB-PAPER-2024-048.-
Geneva : CERN, 2025-05-01 - 15 p.
- Published in : Phys. Rev. D 111 (2025) 092004
Fulltext: 2412.13958 - PDF; LHCb-PAPER-2024-048-supplementary - ZIP; publication - PDF; Related data file(s): ZIP; External link: Supplementary information
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2024-12-16
15:28 |
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2024-12-13
15:13 |
Search for $D^0$ meson decays to $\pi^+ \pi^- e^+ e^-$ and $K^+ K^- e^+ e^-$ final states
/ LHCb Collaboration
A search for $D^0$ meson decays to the $\pi^+\pi^-e^+e^-$ and $K^+K^-e^+e^-$ final states is reported using a sample of proton-proton collisions collected by the LHCb experiment at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 6 fb$^{-1}$. The decay $D^0 \rightarrow \pi^+\pi^-e^+e^-$ is observed for the first time when requiring that the two electrons are consistent with coming from the decay of a $\phi$ or $\rho^0/\omega$ meson. [...]
arXiv:2412.09414; LHCb-PAPER-2024-047; CERN-EP-2024-307; LHCB-PAPER-2024-047.-
Geneva : CERN, 2025-05-01 - 21 p.
- Published in : Phys. Rev. D 111 (2025) L091101
Fulltext: 2412.09414 - PDF; LHCb-PAPER-2024-047 - PDF; publication - PDF; Related data file(s): ZIP; Supplementary information: ZIP;
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2024-12-06
08:52 |
Observation of the open-charm tetraquark state $T_{cs 0}^{*}(2870)^0$ in the $B^- \rightarrow D^- D^0 K_\mathrm{S}^0$ decay
/ Aaij, Roel (Nikhef, Amsterdam) ; Abdelmotteleb, Ahmed Sameh Wagih (Warwick U.) ; Abellan Beteta, Carlos (Zurich U.) ; Abudinén, Fernando Jesus (Warwick U.) ; Ackernley, Thomas (Liverpool U.) ; Adefisoye, A.A. (Syracuse U.) ; Adefisoye, Ayomide Matthew (Syracuse U.) ; Adeva, Bernardo (U. Santiago de Compostela (main)) ; Adinolfi, Marco (Bristol U.) ; Adlarson, Patrik Harri (Uppsala U.) et al.
An amplitude analysis of $B^-\rightarrow D^- D^0 K_\mathrm{S}^0$ decays is performed using proton-proton collision data, corresponding to an integrated luminosity of 9 fb$^{-1}$, collected with the LHCb detector at center-of-mass energies of 7, 8, and 13$\mathrm{\,Te\kern -0.1em V}$. A resonant structure of spin-parity $0^+$ is observed in the $D^0 K_\mathrm{S}^0$ invariant-mass spectrum with a significance of $5.3\,\sigma$. [...]
arXiv:2411.19781; LHCb-PAPER-2024-040; CERN-EP-2024-287; LHCB-PAPER-2024-040.-
Geneva : CERN, 2025-03-11 - 21 p.
- Published in : Phys. Rev. Lett. 134 (2025) 101901
Fulltext: LHCb-PAPER-2024-040 - PDF; 2411.19781 - PDF; Related data file(s): ZIP; Supplementary information: ZIP; publication: PDF;
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2024-11-20
08:50 |
Measurement of $\phi(1020)$ meson production in fixed-target $\textit{p}$Ne collisions at~$\sqrt{s_{NN}}$~=~68.5 GeV.
/ LHCb Collaboration
The first measurement of $\phi(1020)$ meson production in fixed-target $p$Ne collisions at $\sqrt{s_{NN}}=68.5$ GeV is presented. The $\phi(1020)$ mesons are reconstructed in their $K^{+}K^{-}$ decay in a data sample consisting of proton collisions on neon nuclei at rest, corresponding to an integrated luminosity of $21.7 \pm 1.4$ nb$^{-1}$, collected by the LHCb detector at CERN. [...]
arXiv:2411.09343; LHCb-PAPER-2024-036; CERN-EP-2024-274; LHCB-PAPER-2024-036.-
Geneva : CERN, 2025-03-19 - 20 p.
- Published in : JHEP 2503 (2025) 151
Fulltext: LHCB_PAPER_2024_036 - PDF; 2411.09343 - PDF; LHCb_PAPER_2024_036-Supplementary - ZIP; document - PDF; Related data file(s): ZIP;
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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.-
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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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 - 23 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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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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