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2025-12-17
13:49
Search for heavy neutral leptons in B-meson decays / LHCb Collaboration
A search for long-lived heavy neutral leptons produced in B-meson decays and decaying to a $\mu^\pm \pi^\mp$ final state is performed with data collected by the LHCb experiment in proton-proton collisions at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of $5\,\mathrm{fb}^{-1}$. The results are interpreted in both lepton-number-conserving and lepton-number-violating scenarios. [...]
arXiv:2512.14551; LHCb-PAPER-2025-042; CERN-EP-2025-264; LHCB-PAPER-2025-042.- Geneva : CERN, 2026-03-18 - 30 p. - Published in : JHEP 2603 (2026) 178 Fulltext: LHCb_PAPER_2025_042-10 - PDF; 2512.14551 - PDF; document - PDF; Related data file(s): ZIP;

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2025-12-01
14:31
Observation of the rare baryonic decay $B^{+} \rightarrow p \bar{\Lambda}$ and measurement of its weak decay parameter / LHCb Collaboration
The first observation of the decay $B^{+} \rightarrow p \bar{\Lambda}$ is presented, using proton-proton collision data collected by the LHCb experiment between 2016 and 2018 at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of $5.4fb{-1}$. The signal significance exceeds seven standard deviations. [...]
arXiv:2512.00328; LHCb-PAPER-2025-044; CERN-EP-2025-263; LHCB-PAPER-2025-044.- Geneva : CERN, 2026-02-06 - 24 p. - Published in : Phys. Rev. Lett. 136 (2026) 051802 Fulltext: LHCb-PAPER-2025-044_submitted_arxiv - PDF; 2512.00328 - PDF; document - PDF; Related data file(s): ZIP;

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2025-11-25
17:25
Observation and investigation of the $T_{c\bar{c}1}(4430)^{+}$ structure in $B^{+} \to \psi(2S) K_{\text{S}}^{0} \pi^{+}$ decays / LHCb Collaboration
The first four-dimensional amplitude analysis of the $B^{+} \to \psi(2S) K_{\text{S}}^{0} \pi^{+}$ decay is performed with proton-proton collision data collected by the LHCb experiment at $\sqrt{s} = 13~\mathrm{TeV}$, corresponding to an integrated luminosity of $5.4~\mathrm{fb^{-1}}$. The data cannot be fully explained by $B^{+} \to \psi(2S) K^{*+}$ contributions alone. [...]
arXiv:2511.20428; LHCb-PAPER-2025-039; CERN-EP-2025-234; LHCB-PAPER-2025-039.- Geneva : CERN, 2026-04-01 - 13 p. - Published in : Phys. Rev. D 113 (2026) L071101 Fulltext: 2511.20428 - PDF; document - PDF; Related data file(s): ZIP;

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2025-11-14
14:34
Measurement of charged-hadron distributions in heavy-flavor jets in proton-proton collisions at $\sqrt{s}$ = 13 TeV / LHCb Collaboration
Charged-hadron distributions in heavy-flavor jets are measured in proton-proton collisions at a center-of-mass energy of $\sqrt{s}$ = 13 TeV collected by the LHCb experiment. Distributions of the longitudinal momentum fraction, transverse momentum, and radial profile of charged hadrons are measured separately in beauty and charm jets. [...]
arXiv:2511.10216; LHCb-PAPER-2025-038; CERN-EP-2025-230; LHCB-PAPER-2025-038.- Geneva : CERN, 2026-04-02 - 36 p. - Published in : JHEP 2604 (2026) 029 Fulltext: LHCb_PAPER_2025_038 - PDF; 2511.10216 - PDF; document - PDF; Related data file(s): ZIP;

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2025-11-05
18:40
First observation of the $\bar{B}_{s}^0 \to \Lambda_c^+ \bar{\Lambda}_c^-$ decay and evidence for the $\bar{B}^0 \to \Lambda_c^+ \bar{\Lambda}_c^-$ decay / LHCb Collaboration
A search is presented for the two-body charmed baryonic decays $\overline{B}_{(s)}^{0}\toΛ_{c}^{+}\overlineΛ_{c}{}^{-}$, using a data sample collected by the LHCb experiment during 2011--2012 and 2015--2018 corresponding to an integrated luminosity of $9\,\mathrm{fb}^{-1}$. The first observation of the $\overline{B}_{s}^{0}\toΛ_{c}^{+}\overlineΛ_{c}{}^{-}$ decay is reported with $6.2σ$ significance, along with $4.3σ$ evidence for the $\overline{B}^{0}\toΛ_{c}^{+}\overlineΛ_{c}{}^{-}$ decay. [...]
arXiv:2511.20476; LHCb-PAPER-2025-053; CERN-EP-2025-258.- Geneva : CERN, 2026-02-13 - 22 p. - Published in : Phys. Rev. Lett. Fulltext: LHCb-PAPER-2025-053-2CWR - PDF; 2511.20476 - PDF; External links: Additional information for the analysis; Previous draft version

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2025-09-23
13:21
Measurement of the $W \to \mu\nu$ cross-sections as a function of the muon transverse momentum in $pp$ collisions at 5.02 TeV / LHCb Collaboration
The $pp \to W^{\pm} (\to \mu^{\pm} \nu_{\mu}) X$ cross-sections are measured at a proton-proton centre-of-mass energy $\sqrt{s} = 5.02$ TeV using a dataset corresponding to an integrated luminosity of 100 pb$^{-1}$ recorded by the LHCb experiment. Considering muons in the pseudorapidity range $2.2 < \eta < 4.4$, the cross-sections are measured differentially in twelve intervals of muon transverse momentum between $28 < p_\mathrm{T} < 52$ GeV. [...]
arXiv:2509.18817; LHCb-PAPER-2025-031; CERN-EP-2025-197; LHCB-PAPER-2025-031.- Geneva : CERN, 2026-03-16 - 37 p. - Published in : JHEP 2603 (2026) 148 Fulltext: LHCb_PAPER_2025_031 - PDF; 2509.18817 - PDF; document - PDF; Related data file(s): ZIP;

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2025-09-22
16:01
First evidence of CP violation in beauty baryon to charmonium decays / LHCb Collaboration
A study of the difference in the $CP$ asymmetries between ${\Lambda}^0_b \rightarrow J / \psi p \pi^-$ and ${\Lambda}^0_b \rightarrow J / \psi p K^-$ decays, $\Delta {\cal A}_{CP}$, is performed using proton-proton collision data collected by the LHCb experiment in the years 2015-2018, corresponding to an integrated luminosity of $6\,{\rm fb}^{-1}$. This quantity is measured to be $ \Delta {\cal A}_{CP}=(4.03\pm 1.18\pm 0.23)\%$, where the first uncertainty is statistical and the second is systematic. [...]
arXiv:2509.16103; LHCb-PAPER-2025-021; CERN-EP-2025-184; LHCB-PAPER-2025-021.- Geneva : CERN, 2025-12-29 - 11 p. - Published in : Sci. Bull. 71 (2026) 547-557 Fulltext: LHCb-PAPER-2025-021-figures - ZIP; 2509.16103 - PDF; Published version - PDF; CP_paper_3__1_ - PDF; External link: Preprint

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2025-09-19
10:37
A model-independent measurement of the CKM angle $\gamma$ in the decays $B^\pm\to[K^+K^-\pi^+\pi^-]_D h^\pm$ and $B^\pm\to[\pi^+\pi^-\pi^+\pi^-]_D h^\pm$ ($h = K, \pi$) / LHCb Collaboration
A model-independent determination of the CKM angle $\gamma$ is presented, using the $B^\pm\to[K^+K^-\pi^+\pi^-]_D h^\pm$ and $B^\pm\to[\pi^+\pi^-\pi^+\pi^-]_D h^\pm$ decays, with $h=K,\pi$. This measurement is the first phase-space-binned study of these decay modes, and uses a sample of proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of $9$fb$^{-1}$ [...]
arXiv:2509.15139; LHCb-PAPER-2025-019; CERN-EP-2025-199; LHCB-PAPER-2025-019.- Geneva : CERN, 2026-01-09 - 34 p. - Published in : JHEP 2601 (2026) 062 Fulltext: LHCb-PAPER-2025-019 - PDF; 2509.15139 - PDF; document - PDF; Related data file(s): ZIP;

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2025-09-16
16:26
Measurement of the branching fraction of the $\Lambda_b^0\to J\psi\Lambda$ decay and isospin asymmetry of $B\to J\psi K$ decays / LHCb Collaboration
This paper describes a measurement of the $\Lambda_b^0\to J\psi\Lambda$ branching fraction using data collected with the LHCb experiment in proton-proton collisions from 2016 to 2018. The dataset corresponds to an integrated luminosity of 5.4\$\text{fb}^{-1}$. [...]
arXiv:2509.12805; CERN-EP-2025-183; LHCb-PAPER-2025-035; LHCB-PAPER-2025-035.- Geneva : CERN, 2026-01-26 - 30 p. - Published in : JHEP 2601 (2026) 159 Fulltext: LHCb_PAPER_2025_035 - PDF; LHCb-PAPER-2025-035-supplementary - ZIP; Suplementary - PDF; 2509.12805 - PDF; document - PDF; Related data file(s): ZIP;

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2025-08-29
09:01
Inclusive $B$-meson flavour-tagging algorithm at LHCb / LHCb Collaboration
A new algorithm is developed to identify the flavour of neutral $B$ mesons at production in $pp$ collisions by utilising all tracks from the hadronisation process. The algorithm is calibrated separately for $B^0$ and $B^{0}_{s}$ mesons using $B^{0}\to J/\psi K^{+}\pi^-$ and $B^{0}_{s}\to D_{s}^{-}\pi^+$ decays from $pp$ collision data collected by the LHCb experiment at a centre-of-mass energy of 13\,TeV. [...]
arXiv:2508.20180; LHCB-PAPER-2025-024; CERN-EP-2025-168; LHCB-PAPER-2025-024.- Geneva : CERN, 2025-11-10 - 32 p.
Fulltext: IFTRun2Paper - PDF; 2508.20180 - PDF; document - PDF; Related data file(s): ZIP;

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