New measurements of Bc decays into single charm final states - Five products of branching fraction, B(Bc→DX), and fragmentation ratio fc/fu are reported, Additionally, the CP asymmetry in Bc→D0K decays is measured and found to be compatible with zero. arxiv.org/abs/2608.03453
LHCb Experiment
@lhcb.bsky.social
The LHCb experiment at CERN. cern.ch/lhcb-public.
Final readings of @lhcb.bsky.social papers: we have 7 papers these two weeks. And that's not yet counting the new results that will be shown at ICHEP. #LHCbEditorialBoard
Modification of Υ production in pO and OO collisions at LHCb - The significant suppression in OO data, compared to the small effect in pO data, shows the emergence of additional suppression mechanisms in the relatively small OO collision system. arxiv.org/abs/2608.00182
#LHCbpaper soon on arXiv: Search for CP violation in D⁺ → ϕπ⁺ decays (CERN-EP-2026-158) https://cds.cern.ch/record/2967099
Search for the decays B(c)⁺→μ⁺νγ - No evidence for an excess of events over background is observed for either signal decay. This constitutes the first search for these decays at a hadron collider and the first experimental investigation of the Bc⁺→μ⁺νγ decay to date. arxiv.org/abs/2607.12825
Observation of new excited Σc⁰ states in the B⁻→Λc⁺p̅π⁻ decay - the known Σc(2455)⁰, Σc(2520)⁰, Σc(2800)⁰ baryons are observed, along with two new states: Σc(2900)⁰ and Σc(3200)⁰. arxiv.org/abs/2607.10595
Used VELO subdetector on display at Nikhef, after a proven track record at CERN www.nikhef.nl/en/news/used... @cern.bsky.social @lhcb.bsky.social
Used VELO subdetector on display at Nikhef, after a proven track record at CERN - Nikhef
The VELO subdetector, which for many years was one of the central components of the LHCb experiment at CERN, is back at Nikhef. This showcase of Nikhef technology...
nikhef.nl
Differential measurement of the branching fraction and CP asymmetry of the decay B⁺→π⁺μ⁺μ⁻ - The measured branching fractions are compatible with the predictions of the Standard Model, with consistency varying between 1.4σ and 3.8σ depending on the model assumptions. arxiv.org/abs/2606.23646
The @lhcb.bsky.social discovers the final missing member of a doubly charmed particle family 💫 The new particle, composed of one strange quark and two charm quarks, completes a set of particles first theorised over half a century ago. Find out more: home.cern/lhcb-discove...
Measurement of the ratio of branching fractions B(Bc⁺→J/ψτ⁺ν)/B(Bc⁺→J/ψμ⁺ν) - The measured value is found to be R(J/ψ)=0.51±0.12(stat)±0.08(syst), which is within 1.8 standard deviations of the predictions from the Standard Model assuming lepton flavor universality. arxiv.org/pdf/2606.10018
Associated Z + J/ψ production as a probe of multiparton interactions in the forward region - The measured cross-section is 5.5±1.5 pb, significantly exceeding the single-parton scattering expectation of 0.10±0.08 pb, indicating that multiparton interactions dominate. arxiv.org/abs/2606.05786
Observation of the doubly charmed baryon Ωcc+ lhcb-outreach.web.cern.ch/2026/06/03/o...
Observation of the doubly charmed baryon Ωcc+
lhcb-outreach.web.cern.ch
Study of nuclear effects on charm production in light-ion collisions - The onset of nuclear effects in light-ion collisions is studied by measuring the ratio of D meson production between NeNe and OO collisions at a center-of-mass energy per nucleon pair of 5.36TeV. arxiv.org/abs/2605.27273
Evidence for the decay Bₛ⁰→ϕη' - The branching ratio relative to the Bₛ⁰→ϕϕ decay is determined to be R=(3.56±0.79±0.18±0.06)×10⁻² arxiv.org/abs/2605.07586
CP violation analysis of local and nonlocal amplitudes in the B⁰→K*⁰μ⁺μ⁻ decay - The precision of the CP-violation observables is improved by an order of magnitude relative to previous measurement. No significant CP violation is observed. arxiv.org/abs/2605.07582
Observation of the chΛb⁰→Λpp̅ - The signal decay is observed with a significance of 5.1 standard deviations. arxiv.org/abs/2605.04348
Measurement of γ using B⁺→ DK⁺ and B⁺→ Dπ⁺ decays with D→Ks⁰π⁺π⁻ and D→Ks⁰K⁺K⁻ - A measurement of the CKM angle γ is performed with a data sample collected during 2024 by the upgraded LHCb experiment. The CKM angle γ is determined to be γ=(68.1±6.7)∘. arxiv.org/abs/2605.03501
First evidence of the decay B⁺→K⁺e⁺e⁻ - A signal excess with a significance of 3.2σ is observed and the branching fraction is measured to be BR(B⁺→K⁺e⁺e⁻)=(2.4+0.9−0.8+0.4−0.2)×10⁻⁸, where the first set of uncertainties is statistical and the second is systematic arxiv.org/abs/2604.26784
Angular analysis of the B⁺→π⁺μ⁺μ⁻ decay - The Standard Model predictions lie within the obtained 68% confidence level interval in the high-mass and within the 99% interval in the low-mass region. arxiv.org/abs/2604.21987
Observation of a new excited charm-strange meson Dₛ₁(2933)⁺ in B⁰→D⁺D⁻K⁺π⁻ decays - Its Breit-Wigner mass and width are measured to be 2933 MeV and 72 MeV, respectively, and its spin-parity 1⁺. This new meson is a candidate for a Dₛ(2P₁)⁺ state. arxiv.org/abs/2604.21257
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
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
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.