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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 - 29 p. - Published in : JHEP 2503 (2025) 149 Fulltext: 2501.11635 - PDF; document - PDF; Related data file(s): 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 Related data file(s): ZIP; Supplementary information: ZIP; preprint: PDF; 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; 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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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 / Aaij, R. (Nikhef, Amsterdam) ; Abdelmotteleb, A.S.W. (Warwick U.) ; Abellan Beteta, C. (Zurich U.) ; Abudinén, F. (Warwick U.) ; Ackernley, T. (Liverpool U.) ; Adefisoye, A.A. (Syracuse U. (main)) ; Adefisoye, Ayomide Matthew (Syracuse U.) ; Adeva, B. (U. Santiago de Compostela (main)) ; Adinolfi, M. (Bristol U.) ; Adlarson, P. (Uppsala U.) et al.
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 - 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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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 - 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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2024-10-18
09:26

Test of lepton universality with $B_s^0 \rightarrow \phi \ell^+\ell^-$ decays / LHCb Collaboration
Lepton flavour universality in rare

$b\rightarrow s$ transitions is tested for the first time using

$B_s^0$ meson decays. The measurements are performed using

$pp$ collision data collected by the LHCb experiment between 2011 and 2018, corresponding to a total integrated luminosity of 9

$\,{\rm fb}^{-1}$ . [...]
arXiv:2410.13748; LHCb-PAPER-2024-032; CERN-EP-2024-255; LHCB-PAPER-2024-032.- Geneva : CERN, 2025-03-27 - 24 p. - Published in : Phys. Rev. Lett. 134 (2025) 121803 Fulltext: LHCb-PAPER-2024-032-arXiv - PDF; 2410.13748 - PDF; LHCb-PAPER-2024-032-supplementary - PDF; LHCb-PAPER-2024-032-appendix - PDF; Related data file(s): ZIP;

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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: 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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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: 2409.17209 - PDF; document - PDF;

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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: 2409.12629 - PDF; document - PDF; Related data file(s): ZIP; Supplementary information: ZIP;

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