2025-08-26
13:37 |
Measurement of branching fractions and $C\!P$ asymmetries in $\mathit{\Lambda}_b^0(\mathit{\Xi}_b^0)\!\to pK_{\mathrm S}^0h^-$ decays
/ LHCb Collaboration
A study of $\mathit{\Lambda}_b^0$ and $\mathit{\Xi}_b^0$ baryon decays to the final states $pK_{\mathrm S}^0\pi^-$ and $pK_{\mathrm S}^0K^-$ is performed using $pp$ collision data collected by the LHCb experiment, corresponding to an integrated luminosity of $9\,\mathrm{fb}^{-1}$. The decays $\mathit{\Lambda}_b^0\!\to pK_{\mathrm S}^0K^-$ and $\mathit{\Xi}_b^0\!\to pK_{\mathrm S}^0K^-$ are observed for the first time, with significances reaching eight standard deviations. [...]
arXiv:2508.17836; LHCb-PAPER-2025-016; CERN-EP-2025-158; LHCB-PAPER-2025-016.-
Geneva : CERN, 2025-10 - 27 p.
- Published in : JHEP 2510 (2025) 169
Fulltext: 2508.17836v1 - PDF; 2508.17836 - PDF; document - PDF; Related data file(s): ZIP; External link: Fulltext
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2025-07-21
13:54 |
Improved measurement of $\eta / \eta^{\prime}$ mixing in $B^{0}_{(s)} \rightarrow J/\psi \eta^{(\prime)}$ decays
/ LHCb Collaboration
Branching fraction ratios between the decays $B^{0}_{(s)} \rightarrow J/\psi \eta^{(\prime)}$ are measured 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 measured ratios of these branching fractions are \[ \frac{BF(B^{0} \rightarrow J/\psi \eta^{\prime})}{BF(B^{0} \rightarrow J/\psi \eta)} = 0.48 \pm 0.06 \pm 0.02 \pm 0.01, \] \[\frac{BF(B^{0}_{s} \rightarrow J/\psi \eta^{\prime})}{BF(B^{0}_{s} \rightarrow J/\psi \eta)} = 0.80 \pm 0.02 \pm 0.02 \pm 0.01, \] where the uncertainties are statistical, systematic and related to the precision of the $\eta^{(\prime)}$ branching fractions, respectively. [...]
arXiv:2507.13914; LHCb-PAPER-2025-025; CERN-EP-2025-148; LHCB-PAPER-2025-025.-
Geneva : CERN, 2025-07-18 - 32 p.
- Published in : JHEP 2510 (2025) 113
Fulltext: LHCb-PAPER-2025-025 - PDF; 2507.13914 - PDF; Related data file(s): ZIP;
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2025-07-17
16:47 |
Precision measurement of the ${\it{\Xi}}_b^0$ baryon lifetime
/ LHCb Collaboration
A sample of $pp$ collision data, corresponding to an integrated luminosity of 5.4 fb$^{-1}$ and collected by the LHCb experiment during LHC Run 2, is used to measure the ratio of the lifetime of the ${\it{\Xi}}_b^0$ baryon to that of the ${\it{\Lambda}}_b^0$ baryon, $r_{\tau}\equiv\tau_{{\it{\Xi}}_b^0}/\tau_{{\it{\Lambda}}_b^0}$. The value ${r_{\tau}^{\rm Run\,2}=1.004\pm0.009\pm0.006}$ is obtained, where the first uncertainty is statistical and the second systematic. [...]
arXiv:2507.12402; LHCb-PAPER-2025-023; CERN-EP-2025-139.-
Geneva : CERN, 2025-09-01 - 25 p.
- Published in : Phys. Rev. D 112 (2025) 052012
Fulltext: LHCb-PAPER-2025-023-FINAL - PDF; LHCb-PAPER-2025-023-figures - ZIP; LHCb-PAPER-2025-023-supplementary - ZIP; 2507.12402 - PDF; publication - PDF;
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2025-07-15
10:24 |
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2025-06-27
17:01 |
Updated measurement of $CP$ violation and polarisation in $B^0_s \rightarrow J/\psi \overline{K}{}^{*}\kern-1pt(892)^{0}$ decays
/ LHCb Collaboration
A time-integrated angular analysis of the decay $B^0_s \rightarrow J/\psi \overline{K}{}^{*}\kern-1pt(892)^{0}$, with $J/\psi \rightarrow \mu^{+} \mu^{-}$ and $\overline{K}{}^{*}\kern-1pt(892)^{0} \rightarrow K^{-} \pi^{+}$, is presented. The analysis employs a sample of proton-proton collision data collected by the LHCb experiment during 2015-2018 at a centre-of-mass energy of $13 \text{TeV}$, corresponding to an integrated luminosity of $6 \text{fb}^{-1}$. [...]
arXiv:2506.22090; LHCb-PAPER-2025-020; CERN-EP-2025-131; LHCB-PAPER-2025-020.-
Geneva : CERN, 2025-10 - 35 p.
- Published in : 10.1007/JHEP10(2025)173
Fulltext: paper_Bs2JpsiKstarRun2_arxiv - PDF; 2506.22090 - PDF; Related data file(s): ZIP;
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2025-06-16
15:07 |
Measurement of the $\Omega_c^0$ and $\Xi_c^0$ baryon lifetimes using hadronic $b$-baryon decays
/ LHCb Collaboration
The lifetimes of the $\Omega_c^0$ and $\Xi_c^0$ baryons are measured using a $pp$ collision dataset collected by the LHCb experiment, corresponding to an integrated luminosity of $9~\rm{fb^{-1}}$. The charm baryons are produced in the fully reconstructed decay chains $\Omega_b^- \rightarrow \Omega_c^0 (\rightarrow pK^-K^-\pi^+)~\pi^-$ and $\Xi_b^- \rightarrow \Xi_c^0 (\rightarrow pK^-K^-\pi^+)~\pi^-$. [...]
arXiv:2506.13334; LHCb-PAPER-2025-013,CERN-EP-2025-117; LHCb-PAPER-2025-013; CERN-EP-2025-117; LHCB-PAPER-2025-013.-
Geneva : CERN, 2025-09-18 - 25 p.
- Published in : JHEP 2509 (2025) 157
Fulltext: LHCb-PAPER-2025-013 - PDF; pdf - PDF; LHCb-PAPER-2025-013-supplementary - ZIP; 2506.13334 - PDF; document - PDF; Related data file(s): ZIP;
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2025-05-22
10:01 |
Measurement of the $Z$-boson mass
/ LHCb Collaboration
The first dedicated $Z$-boson mass measurement at the LHC with $Z \to \mu^+\mu^-$ decays is reported. The dataset uses proton-proton collisions at a centre-of-mass energy of $13$ TeV, recorded in 2016 by the LHCb experiment, and corresponds to an integrated luminosity of $1.7$ fb$^{-1}$. [...]
arXiv:2505.15582; LHCb-PAPER-2025-008; CERN-EP-2025-111; LHCB-PAPER-2025-008.-
Geneva : CERN, 2025-10-17 - 22 p.
- Published in : Phys. Rev. Lett. 135 (2025) 161802
Fulltext: LHCB-PAPER-2025-008 - PDF; LHCb-PAPER-2025-008-figures - ZIP; figures_supplementary - ZIP; 2505.15582 - PDF; document - PDF;
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2025-05-21
13:57 |
Measurements of charmed meson and antimeson production asymmetries at $\sqrt{s} =13.6$ TeV
/ LHCb Collaboration
This article presents doubly differential measurements of the asymmetries in production rates between mesons containing a charm quark and those containing an anticharm quark in proton-proton collisions at a centre-of-mass energy of $\sqrt{s}=13.6$ TeV using data recorded by the LHCb experiment. The asymmetries of $D^0$, $D^+$ and $D_s^+$ mesons are measured for two-dimensional intervals in transverse momentum and pseudorapidity, within the range $2.5< p_T<25.0$ GeV$/c$ and $2.0<\eta<4.5$. [...]
arXiv:2505.14494; LHCb-PAPER-2024-052; CERN-EP-2025-087; LHCB-PAPER-2024-052.-
Geneva : CERN, 2025-10-07 - 43 p.
- Published in : JHEP 2510 (2025) 050
Fulltext: LHCb-PAPER-2024-052 - PDF; 2505.14494 - PDF; document - PDF; Related data file(s): ZIP; Supplementary information: ZIP;
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2025-05-20
10:17 |
First measurement of $b$-jet mass with and without grooming
/ LHCb Collaboration
The LHCb collaboration presents a novel suite of heavy-flavour jet substructure measurements at forward rapidity in proton-proton collisions at a centre-of-mass energy of $\sqrt{s} = 13$ TeV. The jet mass is a perturbatively calculable probe of the virtuality of hard-scattered quarks and gluons, connecting small-distance quantum chromodynamics (QCD) with long-distance experimental measurement. [...]
arXiv:2505.11955; LHCb-PAPER-2025-009; CERN-EP-2025-097.-
Geneva : CERN, 2025-09-05 - 28 p.
- Published in : Phys. Lett. B 869 (2025) 139854
Fulltext: LHCb-PAPER-2025-009 (without supplementary material) - PDF; 2505.11955 - PDF; 1-s2.0-S0370269325006148-main - PDF; Related data file(s): ZIP;
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2025-05-07
16:32 |
Measurement of the branching fraction ratio $R_K$ at large dilepton invariant mass
/ LHCb Collaboration
A test of lepton universality between muons and electrons is performed using $B^+ \rightarrow K^+\ell^+\ell^-$ decays (where $\ell = e$, $\mu$), in the dilepton invariant-mass-squared region above 14.3 GeV$^2/c^4$. The data used for the measurement consists of beauty meson decays produced in proton-proton collisions, corresponding to an integrated luminosity of $9\,$fb$^1$, collected by the LHCb experiment between 2011 and 2018. [...]
arXiv:2505.03483; LHCb-PAPER-2024-056; CERN-EP-2025-069.-
2025-07-17 - 36 p.
- Published in : JHEP 2507 (2025) 198
Document: PDF; Fulltext: PDF file of the exact version going to the arXiv - PDF; 2505.03483 - PDF; Supplementary material - ZIP; document - PDF; Related data file(s): ZIP;
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