Study of the B⁰→Λc⁺Λ̅c⁻Ks⁰ decay - Evidence is found for contributions from two resonant states, Ξc(2923)⁺ and Ξc(2939)⁺, in the Λc⁺Ks⁰ system. arxiv.org/abs/2604.15040

Measurement of the W-boson production cross-sections in pp collisions at √s = 13 TeV in the forward region - The cross-section is measured for muons with transverse momentum between 25 and 55 GeV and pseudorapidity between 2.0 and 4.5. arxiv.org/abs/2604.12706

Precision measurement of the muon charge asymmetry from W-boson decays in pp collisions at √s = 13 TeV in the forward region - This result represents the most precise determination of the muon charge asymmetry in the forward region to date. arxiv.org/abs/2604.12593

Measurement of inclusive production of charmonium states in b-hadron decays via their decay into ϕϕ - The inclusive production of the ηc(1S), ηc(2S) and χc charmonium states in b-hadron decays is studied with LHCb Run~2 data using charmonia decays to ϕϕ pairs. arxiv.org/abs/2604.11123

Test of lepton flavour universality with B⁰→ K*⁰ℓ⁺ℓ⁻ decays at large dilepton invariant mass - The ratio of branching fractions between the muon and electron channels is measured to be 1.08+0.14−0.12(stat) ±0.07(syst) for a dilepton-invariant-mass squared above 14.0 GeV² arxiv.org/abs/2604.08631

More details are in arxiv.org/abs/2604.05701

Precise measurement of the CKM angle γ with a novel approach - A measurement of the CKM angle γ is performed by applying a novel, unbinned, model-independent approach to datasets of collected by the BESIII and LHCb experiments and yields γ=(71.3±5.0)∘. arxiv.org/abs/2604.05701

Search for the lepton-flavour violating decays B⁺→π⁺μ⁺e⁻ and B⁺→π⁺μ⁻e⁺ - No signal is observed and an upper limit on the branching fraction is set at <1.8×10⁻⁹ at the 90% confidence level, two orders of magnitude more restrictive than the current world average.
arxiv.org/abs/2604.08396

Search for the decays Bₛ⁰→J/ψγ at LHCb - Assuming no contribution from B⁰→J/ψγ decay, an upper limit is set on the branching fraction B(Bₛ⁰→J/ψγ)<2.9× 10⁻⁶. If no contribution from Bₛ⁰→J/ψγ decay is assumed, the limit is B(B⁰→J/ψγ)<2.5×10⁻⁶ at the 90% confidence level. arxiv.org/pdf/2604.02933

Observation of the doubly charmed baryon Ξcc⁺ with the LHCb Run 3 detector - The Ξ+cc mass is measured to be 3619.97±0.83±0.26+1.90−1.30MeV, where the third uncertainty is due to the unknown lifetime, which is assumed to lie in the range 15-160 fs. arxiv.org/abs/2603.28456

Measurement of CP asymmetries in B̅⁰→Dₛ⁻D⁺ and B̅⁰ₛ→Dₛ⁺D⁻ decays - The measurements are found to be ACP(B̅⁰→Dₛ⁻D⁺) = 0.0009±0.0053±0.0040, ACP(B̅⁰ₛ→Dₛ⁺D⁻ ) = 0.103±0.053±0.010, This is the first measurement of this asymmetry in B̅⁰ₛ decays.
arxiv.org/abs/2603.28132

B-jet fragmentation with B⁺→ J/ψK⁺ decays in √s=13 TeV pp collisions at LHCb arxiv.org/abs/2603.23663 - The results suggest a growing contribution of gluon fragmentation to B⁺ mesons as the jet transverse momentum increases.

The LHCb Collaboration discovers new proton-like particle

Composed of two charm quarks and one down quark, the doubly charmed particle is four times heavier than a proton.

Find out more: home.cern/news/news/ex...

Fit to the m(µµ) distribution using form factors from the HPQCD collaboration for: (top left) negative J/ψ phase, positive ψ(2S) phase; (top right) positive J/ψ phase, positive ψ(2S) phase; (bottom left) negative J/ψ phase, negative ψ(2S) phase; (bottom right) positive J/ψ phase, negative ψ(2S) phase.

Measurement of the local and nonlocal amplitudes in B⁺→ K⁺μ⁺μ⁻ decays arxiv.org/abs/2603.12477 - The compatibility of the Wilson coefficient combinations C9+C′9 and C10+C′10 with the Standard Model prediction is found to vary between 1.6σ and 4σ, depending on the choice of local form factors.

First measurement of time-dependent CP violation in the decay flavor-changing neutral-current decay B⁰→Kₛ⁰μ⁺μ⁻ arxiv.org/abs/2603.13223 - The CP violation parameters are determined to be C=−0.13±0.32±0.04 and S=+0.82±0.29±0.05, are consistent with the Standard Model prediction.

First measurement of the decay-time-integrated CP asymmetry in Bₛ⁰→Dₛ⁻π⁺ decays arxiv.org/abs/2603.10860 - The combined result, (−1.4±5.9(stat)±1.1(syst))×10⁻³, is consistent with the Standard Model expectation and provides a direct constraint on new physics in tree-level b-hadron decays.

Improved branching-fraction measurements of B⁰(s)→ Ks⁰h⁺h⁻' decays and first observation of B⁰(s)→ Ks⁰K⁺K⁻ arxiv.org/abs/2603.08621

LHCb releases service to access Run II data
lhcb-outreach.web.cern.ch/2026/03/03/l...

#LHCbpaper soon on arXiv: Polarization measurement of Λ⁺_c and Λ⁻_c baryons in pNe collisions at √(s_NN) = 68.6 GeV (CERN-EP-2026-016) https://cds.cern.ch/record/2954975

Search for τ⁻→μ⁻μ⁻μ⁺ decays at the LHCb experiment with Run 2 data arxiv.org/abs/2601.20785 - An upper limit of 1.9(2.3)×10⁻⁸ is set at the 90% (95%) confidence level on the branching fraction of the decay.

Observation of the decay χc₁(3872)→J/ψμ⁺μ⁻ arxiv.org/abs/2601.20790 - Its branching fraction is measured relative to the χc1(3872)→J/ψπ⁺π⁻ decay mode as (1.64±0.32±0.05)×10⁻³.

Machine learning techniques for jet reconstruction at LHCb and application to the search for H→bb̅ and H→cc̅ in √s=13 TeV pp collisions arxiv.org/abs/2601.16802 - The observed (expected) 95% confidence level upper limits correspond to 6.6 (11.1), and 1003 (1834) times the SM, respectively.

Observation of CP violation in B⁰→J/ψρ(770)⁰ decays arxiv.org/abs/2601.15646 - The CP-violation parameters for this process are determined to be 2β=0.710±0.084±0.028 rad and |λ|=1.019±0.034±0.009, where the first uncertainty is statistical and the second systematic.

Evidence for the rare decay B⁺→Λ̅pμ⁺μ⁻ arxiv.org/abs/2601.06878 - In the low invariant-mass region of m(Λ̅p)<2.8 GeV, the branching fraction is measured to be (1.70+0.65−0.56(stat)±0.17(syst)±0.14(ext))×10⁻⁸.

Search for lepton-number-violating B⁻→D⁽*⁾⁺μ⁻μ⁻ decays arxiv.org/abs/2601.07657 - No significant signal is observed, and upper limits are set on the branching fractions, B(B⁻→D⁺μ⁻μ⁻)<4.6×10⁻⁸ and B(B⁻→D*⁺μ⁻μ⁻)<5.9×10⁻⁸, at the 95% confidence level.

First evidence of the Bₛ⁰→K⁻π⁺γ decay arxiv.org/abs/2601.03083 - The photons are reconstructed through their conversion into an electron-positron pair, which significantly improves the mass resolution. A signal excess with a significance of 3.5 standard deviations is measured.

🎄A comprehensive analysis of the B⁰→ K*⁰μ⁺μ⁻ decay arxiv.org/abs/2512.18053 - The measurements of the CP-averaged observables and the branching fractions continue to exhibit the pattern of tensions with the Standard Model predictions that have been seen in previous analyses.

Search for heavy neutral leptons in B-meson decays arxiv.org/abs/2512.14551 - The results are interpreted in both lepton-number-conserving and lepton-number-violating scenarios. No significant excess is observed. Constraints are placed on the mixing element |UμN| to the active muon neutrino.

Measurement of the top-quark production cross-section and charge asymmetry at LHCb arxiv.org/abs/2512.11324 - The cross-sections for the top and antitop quarks are σt=0.95±0.04±0.08±0.02 pb, σt¯=0.81±0.03±0.07±0.02 pb.. The top-quark charge asymmetry is measured to be AtC=0.08±0.03±0.01.

Precision measurement of CP violation and branching fractions in B⁺→Ksh⁺ (h=π,K) decays and search for the rare decay Bc⁺→KsK⁺ arxiv.org/abs/2512.09288 - The branching-fraction ratio is measured to be B(B⁺→KsK⁺)/B(B⁺→Ksπ⁺)=0.055±0.004±0.002.