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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
First observation of the $\mathit{\Lambda}_b^{0}\!\rightarrow\mathit{\Lambda}_{c}^{+}D_{s}^{-}K^{+}K^{-}$ decay and search for pentaquarks in the $\mathit{\Lambda}_{c}^{+}D_{s}^{-}$ system / LHCb Collaboration
The $\mathit{\Lambda}_b^{0}\!\rightarrow\mathit{\Lambda}_{c}^{+}D_{s}^{-}K^{+}K^{-}$ decay is observed for the first time using the data sample from proton-proton collisions recorded at a center-of-mass energy of $13\,\text{TeV}$ with the LHCb detector, corresponding to an integrated luminosity of $6\,\text{fb}^{-1}$. The ratio of branching fraction to that of $\mathit{\Lambda}_b^{0} \!\rightarrow\mathit{\Lambda}_{c}^{+}D_{s}^{-}$ decays is measured as $0.0141 \pm 0.0019 \pm 0.0012$, where the first uncertainty is statistical and the second systematic. [...]
arXiv:2507.10713; LHCb-PAPER-2025-022; CERN-EP-2025-138; LHCB-PAPER-2025-022.- Geneva : CERN, 2025-09-01 - 24 p. - Published in : Phys. Rev. D 112 (2025) 052013 Fulltext: LHCb_PAPER_2025_022 - PDF; LHCb-PAPER-2025-022-figures - ZIP; 2507.10713 - PDF; publication - PDF;

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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: 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: 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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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 - PDF; 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: LHCb-PAPER-2025-006-arXiv - PDF; 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: LHCb-PAPER-2025-002 - PDF; 2504.06096 - PDF; publication - PDF; Related data file(s): ZIP;

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