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2026-01-29
14:05
Observation of the decay $\chi_{c1}(3872) \to J/\psi \mu^+ \mu^-$ / LHCb Collaboration
The first observation of the $\chi_{c1}(3872)\rightarrow J\mskip -3mu/\mskip -2mu\psi \mu^+\mu^-$ decay is reported using proton-proton collision data recorded with the LHCb detector corresponding to an integrated luminosity of $9fb^{-1}$. The decay mode is observed for the first time, with a significance of $6.5\sigma$. [...]
arXiv:2601.20790; LHCb-PAPER-2025-043; CERN-EP-2025-271.- Geneva : CERN, 2026-04-01 - 21 p. - Published in : Phys. Rev. D 113 (2026) 072019 Fulltext: LHCb_PAPER_2025_043 - PDF; 2601.20790 - PDF; document - PDF; Related data file(s): ZIP;

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2026-01-07
15:25
First evidence of the $B_s^0\rightarrow K^-\pi^+\gamma$ decay / LHCb Collaboration
The first search for the $B_s^0\rightarrow K^-\pi^+\gamma$ decay in the range $796< m(K^-\pi^+)<1800\,\text{Me\kern -0.1em V\!/}c^2$ is performed using data from proton-proton collisions 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 photons are reconstructed through their conversion into an electron-positron pair, which significantly improves the mass resolution of the reconstructed decays with respect to decays with an unconverted photon. [...]
arXiv:2601.03083; LHCb-PAPER-2025-056; CERN-EP-2025-276; LHCB-PAPER-2025-056.- Geneva : CERN, 2026-04-30 - 23 p. - Published in : Phys. Rev. Lett. 136 (2026) 171801 Fulltext: LHCb_PAPER_2025_056 - PDF; LHCb-PAPER-2025-056-supplementary - ZIP; 2601.03083 - PDF; document - PDF; Related data file(s): ZIP;

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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: 2512.14551 - PDF; document - PDF; Related data file(s): ZIP;

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2025-12-11
13:40
Precision measurement of CP violation and branching fractions in $B^{\pm} \to K^0_{\mathrm{S}} h^{\pm}$ $(h = \pi, K)$ decays and search for the rare decay $B_c^{\pm} \to K ^0_{\mathrm{S}} K^{\pm}$ / LHCb Collaboration
The decay $B^{\pm} \to K^0_{\mathrm{S}} \pi^{\pm}$, with a $CP$ asymmetry expected to be close to zero in the Standard Model, is theoretically clean and sensitive to potential new physics. An analysis of the decays $B^{\pm} \to K^0_{\mathrm{S}} \pi^{\pm}$ and $B^{\pm} \to K^0_{\mathrm{S}} K^{\pm}$ is performed using proton-proton collision data collected by the LHCb experiment at a center-of-mass energy of $13\,\mathrm{TeV}$, corresponding to an integrated luminosity of $5.4\,\mathrm{fb}^{-1}$. [...]
arXiv:2512.09288; CERN-EP-2025-261; LHCb-PAPER-2025-049.- Geneva : CERN, 2026-04 - 23 p. - Published in : Phys. Rev. Lett. 136 (2026) 161801 Fulltext: LHCb-PAPER-2025-049_paper - PDF; 2512.09288 - 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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2025-11-20
13:59
Branching fraction measurement of the $\Lambda \rightarrow p \mu^- \overline{\nu}_{\mu}$ decay. / LHCb Collaboration
A measurement of the branching fraction for the decay $\Lambda \to p \mu^- \overline{\nu}_{\mu}$ is presented using $\textit{pp}$ collision data collected by the LHCb experiment at a centre-of-mass energy of 13 TeV. The analysis is based on data recorded between 2016 and 2018, corresponding to an integrated luminosity of $5.4 \ \text{fb}^{-1}$. [...]
arXiv:2511.15681; LHCb-PAPER-2025-030; CERN-EP-2025-223.- Geneva : CERN, 2026-04-14 - 27 p. - Published in : JHEP 2604 (2026) 096 Fulltext: LHCb-PAPER-2025-030-supplementary - ZIP; 2511.15681 - PDF; LHCb-PAPER-2025-030-figures-update - ZIP; document - PDF;

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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 - 40 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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2025-10-16
08:51
Searches for $B^0\to K^+\pi^-\tau^+\tau^-$ and $B_s^0\to K^+K^-\tau^+\tau^-$ decays / LHCb Collaboration
The first searches for $B^0\to K^+\pi^-\tau^+\tau^-$ and $B^0_s\to K^+K^-\tau^+\tau^-$ decays at the LHCb experiment are conducted with $pp$ collision data corresponding to an integrated luminosity of $5.4\textrm{ fb}^{-1}$. The tau leptons are reconstructed using the $\tau^+\to \mu^+\overline{\nu}_\tau\nu_\mu$ decay and the results are presented in bins of $K^+\pi^-$ or $K^+K^-$ mass. [...]
arXiv:2510.13716; LHCb-PAPER-2025-048; CERN-EP-2025-224; LHCB-PAPER-2025-048.- Geneva : CERN, 2026-05-05 - 23 p. - Published in : Phys. Rev. Lett. 136 (2026) 181802 Fulltext: LHCb-PAPER-2025-048 - PDF; LHCb-PAPER-2025-048-supplementary-1 - ZIP; 2510.13716 - PDF; document - PDF; Related data file(s): ZIP;

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