2025-04-30
10:10 |
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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, whereas 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 : Nature 643 (2025) 1223-1228
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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