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2025-04-30
10:10

Observation of the decay $B_s^0 \to K_S^0 p \bar{p}$ and measurement of the $B_{(s)}^0 \to K_S^0 p\bar{p}$ branching fraction / LHCb Collaboration
A study of the charmless baryonic decays

$B^0_{(s)}\rightarrow K^0 p \bar{p}$ is presented, where

$B^0_{(s)}$ denotes either a

$B^0$ or a

$B^0_s$ meson. The analysis is based on proton-proton collision data collected by the LHCb experiment at centre-of-mass energies of 7, 8, and

$13~\mathrm{Tev}$ , corresponding to an integrated luminosity of

$9~\mathrm{fb}^{-1}$ . [...]
arXiv:2504.21269; LHCb-PAPER-2025-001; CERN-EP-2025-085.- Geneva : CERN, 2025-07-09 - 25 p. - Published in : JHEP 2507 (2025) 121 Fulltext: LHCb-PAPER-2025-001-supplementary - PDF; LHCb-PAPER-2025-001-Supplementary - ZIP; 2504.21269 - PDF; document - PDF; Related data file(s): ZIP;

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2025-04-10
15:16

Angular analysis of the decay $B_s^0 \to \phi e^+e^-$ / LHCb Collaboration
An angular analysis of the decay

$B^0_s\to\phi e^+e^-$ is presented, using proton-proton collision data collected with the LHCb detector between 2011 and 2018 at centre-of-mass energies of 7, 8 and 13

$\,\mathrm{Te\kern -0.1em V}$ . The combined dataset corresponds to an integrated luminosity of

$9\,\mathrm{fb}^{-1}$ . [...]
arXiv:2504.06346; LHCb-PAPER-2025-006; CERN-EP-2025-064; LHCB-PAPER-2025-006.- Geneva : CERN, 2025-07-03 - 29 p. - Published in : JHEP 2507 (2025) 069 Fulltext: 2504.06346 - PDF; document - PDF; Related data file(s): ZIP;

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2025-04-08
17:10

Observation of the very rare $\Sigma^+ \to p \mu^+ \mu^-$ decay / LHCb Collaboration
The first observation of the

$\Sigma^+ \to p \mu^+ \mu^-$ decay is reported with high significance using proton-proton collision data, corresponding to an integrated luminosity of

$5.4\,\rm{fb}^{-1}$ , collected with the LHCb detector at a centre-of-mass energy of 13~TeV. A yield of

$237\pm 16$

$\Sigma^+ \to p \mu^+ \mu^-$ decays is obtained, where the uncertainty is statistical only. [...]
arXiv:2504.06096; LHCb-PAPER-2025-002; CERN-EP-2025-074.- Geneva : CERN, 2025-07-29 - 27 p. - Published in : Phys. Rev. Lett. 135 (2025) 051801 Fulltext: 2504.06096 - PDF; publication - PDF; Related data file(s): ZIP;

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2025-03-25
16:29

Observation of charge-parity symmetry breaking in baryon decays / LHCb Collaboration
The Standard Model of particle physics, the theory of particles and interactions at the smallest scale, predicts that matter and antimatter interact differently due to violation of the combined symmetry of charge conjugation (

$C$ ) and parity (

$P$ ). Charge conjugation transforms particles into their antimatter particles, while the parity transformation inverts spatial coordinates. [...]
arXiv:2503.16954; LHCb-PAPER-2024-054; CERN-EP-2025-031; LHCB-PAPER-2024-054.- Geneva : CERN, 2025-07-16 - 6 p. - Published in : 10.1038/s41586-025-09119-3 Fulltext: LHCb-PAPER-2024-054-supplementary - ZIP; 2503.16954 - PDF; document - PDF; Related data file(s): ZIP; External links: Interactions.org; Interactions.org

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2025-03-11
08:43

Branching fraction measurement of the decay $B^+ \to \psi(2S) \phi(1020) K^+$ / LHCb Collaboration
The branching fraction of the decay

$B^+\to \psi(2S)\phi(1020)K^+$ , relative to the topologically similar decay

$B^+\to J/\psi \phi(1020) K^+$ , is measured using proton-proton collision data collected by the LHCb experiment at center-of-mass energies of 7, 8, and 13 TeV, corresponding to an integrated luminosity of

$9\,\mathrm{fb}^{-1}$ . The ratio is found to be

$0.061 \pm 0.004 \pm 0.009$ , where the first uncertainty is statistical and the second systematic. [...]
arXiv:2503.02711; LHCb-PAPER-2024-039; CERN-EP-2025-011.- Geneva : CERN, 2025-05-01 - 15 p. - Published in : Phys. Rev. D 111 (2025) 092008 Fulltext: 2503.02711 - PDF PDF; PhysRevD.111.092008 - PDF; Related data file(s): ZIP;

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2025-02-17
10:35

Angular analysis of $B^0 \to K^{*0} e^+e^-$ decays / LHCb Collaboration
An angular analysis of

$B^0\rightarrow K^{*0}e^{+}e^{-}$ decays is presented using proton-proton collision data collected by the LHCb experiment at centre-of-mass energies of 7, 8 and 13 TeV, corresponding to an integrated luminosity of 9 fb

$^{-1}$ . The analysis is performed in the region of the dilepton invariant mass squared of 1.1-6.0 GeV

$^{2}/c^{4}$ . [...]
arXiv:2502.10291; LHCb-PAPER-2024-022; CERN-EP-2025-001.- Geneva : CERN, 2025-06-13 - 61 p. - Published in : JHEP 2506 (2025) 140 Fulltext: 2502.10291 - PDF; document - PDF; Related data file(s): ZIP;

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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, 2025-05-02 - 25 p. - Published in : JHEP 2505 (2025) 011 Fulltext: 2501.12611 - PDF; document - PDF; Related data file(s): ZIP;

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2025-02-06
13:46

Search for resonance-enhanced $CP$ and angular asymmetries in the $\Lambda^+_c\to p\mu^+\mu^-$ decay at LHCb / LHCb Collaboration
The first measurement of the

$CP$ asymmetry of the decay rate (

$A_{CP}$ ) and the

$CP$ average (

$\Sigma A_{\text{FB}}$ ) and

$CP$ asymmetry (

$\Delta A_{\text{FB}}$ ) of the forward-backward asymmetry in the muon system of

$\mathit{\Lambda}^+_c\to p\mu^+\mu^-$ decays is reported. The measurement is performed using a data sample of proton-proton collisions, recorded by the LHCb experiment from 2016 to 2018 at a center-of-mass energy of 13

$\text{ TeV}$ , which corresponds to an integrated luminosity of 5.4

$\text{ fb}^{-1}$ . [...]
arXiv:2502.04013; LHCb-PAPER-2024-051; CERN-EP-2024-340; LHCB-PAPER-2024-051.- Geneva : CERN, 2025-05-01 - 14 p. - Published in : Phys. Rev. D 111 (2025) L091102 Fulltext: LHCb-PAPER-2024-051-supplementary - ZIP; 2502.04013 - PDF; publication - PDF; Related data file(s): ZIP;

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2025-01-28
14:01

Evidence for $B^-\rightarrow D^{**0}\tau^-\overline{\nu}_{\tau}$ decays / LHCb Collaboration
The first evidence for the decay

$B^-\rightarrow D^{**0}\tau^-\overline{\nu}_{\tau}$ is obtained using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9 fb

$^{-1}$ , at centre-of-mass energies of 7, 8 and 13 Tev. Here, the

$D^{**0}$ meson represents any of the three excited charm mesons

$D_{1}(2420)^{0}$ ,

$D_{2}^{*}(2460)^{0}$ , and

$D_{1}^{'}(2400)^{0}$ . [...]
arXiv:2501.14943; LHCb-PAPER-2024-037; CERN-EP-2024-341; LHCB-PAPER-2024-037.- Geneva : CERN, 2025-07-08 - 15 p. - Published in : Phys. Rev. Lett. 135 (2025) 021802 Fulltext: 2501.14943 - PDF; document - PDF; Related data file(s): ZIP; Supplementary information: ZIP;

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2025-01-22
15:03

Observation of the $\Lambda_{b}^{0} \to J/\psi\Xi^{-} K^+$ and $\Xi_{b}^{0} \to J/\psi\Xi^{-} \pi^+$ decays / LHCb Collaboration
The first observation of the

$\Xi_b^0 \to J/\psi \Xi^- \pi^+$ decay and the most precise measurement of the branching fraction of the

$\Lambda_b^0 \to J/\psi \Xi^- K^+$ decay are reported, using proton-proton collision data from the LHCb experiment collected in 2016--2018 at a centre-of-mass energy of 13~TeV, corresponding to an integrated luminosity of 5.4~fb

$^{-1}$ . Using the

$\Lambda_b^0 \to J/\psi \Lambda$ and

$\Xi_b^0 \to J/\psi \Xi^-$ decays as normalisation channels, the ratios of branching fractions are measured to be:

$\frac{\mathcal{B}(\Lambda_b^0 \to J/\psi \Xi^- K^+)}{\mathcal{B}(\Lambda_b^0 \to J/\psi \Lambda)} = (1.17 \pm 0.14 \pm 0.08)\times 10^{-2} \, ,$

$\frac{\mathcal{B}(\Xi_b^0 \to J/\psi \Xi^- \pi^+)}{\mathcal{B}(\Xi_b^0 \to J/\psi \Xi^-)} = (11.9 \pm 1.4 \pm 0.6)\times 10^{-2}\, ,$ where the first uncertainty is statistical and the second systematic..
arXiv:2501.12779; CERN-EP-2024-337 LHCb-PAPER-2024-049; CERN-EP-2024-337; LHCb-PAPER-2024-049; LHCB-PAPER-2024-049.- Geneva : CERN, 2025-07-28 - 15 p. - Published in : Eur. Phys. J. C 85 (2025) 812 Fulltext: 2501.12779 - PDF; document - PDF; Related data file(s): ZIP; Supplementary information: ZIP;

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