LHCb Experiment
@lhcb.bsky.social
The LHCb experiment at CERN. cern.ch/lhcb-public.
Observation and investigation of the Tcc̅1(4430)⁺ structure in B⁺→ψ(2S)Ks⁰π⁺ decays arxiv.org/abs/2511.20428 - The properties of the Tcc̅1(4430)⁺ structure are consistent with the exotic state reported in the isospin-related B̅⁰→ψ(2S)K⁻π⁺ decay.
November 26, 2025 at 9:13 AM
Observation and investigation of the Tcc̅1(4430)⁺ structure in B⁺→ψ(2S)Ks⁰π⁺ decays arxiv.org/abs/2511.20428 - The properties of the Tcc̅1(4430)⁺ structure are consistent with the exotic state reported in the isospin-related B̅⁰→ψ(2S)K⁻π⁺ decay.
First observation of the Bₛ⁰→Λc⁺Λ̅c⁻ decay and evidence for the B⁰→Λc⁺Λ̅c⁻ decay arxiv.org/abs/2511.20476 - The branching fractions are measured to be (1.01+0.27−0.28±0.08±0.15)×10⁻⁵ and (5.0±1.3±0.5±0.8)×10⁻⁵.
November 26, 2025 at 9:12 AM
First observation of the Bₛ⁰→Λc⁺Λ̅c⁻ decay and evidence for the B⁰→Λc⁺Λ̅c⁻ decay arxiv.org/abs/2511.20476 - The branching fractions are measured to be (1.01+0.27−0.28±0.08±0.15)×10⁻⁵ and (5.0±1.3±0.5±0.8)×10⁻⁵.
Reposted by LHCb Experiment
Here are the first event displays from @atlasexperiment.bsky.social @cmsexperiment.bsky.social the ALICE Experiment and @lhcb.bsky.social recorded last Friday.
Discover more about quark-gluon plasma: www.youtube.com/watch?v=mBfJ...
Discover more about quark-gluon plasma: www.youtube.com/watch?v=mBfJ...
Quark-gluon plasma Explained - Ep. 1/2
YouTube video by CERN
www.youtube.com
November 21, 2025 at 11:01 AM
Here are the first event displays from @atlasexperiment.bsky.social @cmsexperiment.bsky.social the ALICE Experiment and @lhcb.bsky.social recorded last Friday.
Discover more about quark-gluon plasma: www.youtube.com/watch?v=mBfJ...
Discover more about quark-gluon plasma: www.youtube.com/watch?v=mBfJ...
Differential decay rate of B⁺→J/ψK⁺ with the LHCb Upgrade I experiment arxiv.org/abs/2511.16564 - The normalised decay rate is measured using a data sample corresponding to an integrated luminosity of 1.1fb−1 collected during October 2024 with the upgraded (Upgrade I) LHCb detector.
November 21, 2025 at 9:14 AM
Differential decay rate of B⁺→J/ψK⁺ with the LHCb Upgrade I experiment arxiv.org/abs/2511.16564 - The normalised decay rate is measured using a data sample corresponding to an integrated luminosity of 1.1fb−1 collected during October 2024 with the upgraded (Upgrade I) LHCb detector.
Branching fraction measurement of the Λ→pμν decay arxiv.org/abs/2511.15681 - This result improves the precision of the branching fraction measurement by a factor of two compared to the previous best measurement and sets a more stringent bound on lepton flavour universality in s→u quark transitions.
November 20, 2025 at 6:42 AM
Branching fraction measurement of the Λ→pμν decay arxiv.org/abs/2511.15681 - This result improves the precision of the branching fraction measurement by a factor of two compared to the previous best measurement and sets a more stringent bound on lepton flavour universality in s→u quark transitions.
Measurement of charged-hadron distributions in heavy-flavor jets in proton-proton collisions at √s=13 TeV arxiv.org/abs/2511.10216 - The observed differences between the heavy- and light-jet distributions are consistent with the heavy-quark dynamics expected to arise from the dead-cone effect [...].
November 14, 2025 at 6:42 AM
Measurement of charged-hadron distributions in heavy-flavor jets in proton-proton collisions at √s=13 TeV arxiv.org/abs/2511.10216 - The observed differences between the heavy- and light-jet distributions are consistent with the heavy-quark dynamics expected to arise from the dead-cone effect [...].
Search for K⁰→π⁺π⁻μ⁺μ⁻ decays at LHCb arxiv.org/abs/2511.02619 - Upper limits are set for the first time on the branching fractions B(K⁰s→π⁺π⁻μ⁺μ⁻)<1.4×10⁻⁹ and B(K⁰L→π⁺π⁻μ⁺μ⁻)<6.6×10⁻⁷, at the 90% confidence level.
November 5, 2025 at 8:46 AM
Search for K⁰→π⁺π⁻μ⁺μ⁻ decays at LHCb arxiv.org/abs/2511.02619 - Upper limits are set for the first time on the branching fractions B(K⁰s→π⁺π⁻μ⁺μ⁻)<1.4×10⁻⁹ and B(K⁰L→π⁺π⁻μ⁺μ⁻)<6.6×10⁻⁷, at the 90% confidence level.
For the first time LHCb recorded 10/fb pp collisions in a single year.
The legacy detector which we upgraded in 2018-21 collected a total of 9/fb between 2010 and 2018.
The legacy detector which we upgraded in 2018-21 collected a total of 9/fb between 2010 and 2018.
October 17, 2025 at 6:21 AM
For the first time LHCb recorded 10/fb pp collisions in a single year.
The legacy detector which we upgraded in 2018-21 collected a total of 9/fb between 2010 and 2018.
The legacy detector which we upgraded in 2018-21 collected a total of 9/fb between 2010 and 2018.
Measurement of CP asymmetry in D⁰→KsKs decays with the LHCb Upgrade I detector arxiv.org/abs/2510.14732 - A measurement of CP asymmetry in D⁰→KsKs decays is reported using 6.2/fb recorded with the LHCb Upgrade I detector. This is the most precise determination of this quantity to date.
October 17, 2025 at 6:07 AM
Measurement of CP asymmetry in D⁰→KsKs decays with the LHCb Upgrade I detector arxiv.org/abs/2510.14732 - A measurement of CP asymmetry in D⁰→KsKs decays is reported using 6.2/fb recorded with the LHCb Upgrade I detector. This is the most precise determination of this quantity to date.
Searches for B⁰→K⁺π⁻τ⁺τ⁻ and Bₛ⁰→K⁺K⁻τ⁺τ⁻ decays arxiv.org/abs/2510.13716 - This is he first limit for the Bₛ⁰→K⁺K⁻τ⁺τ⁻ decay. For the decay B⁰→K*(892)⁰τ⁺τ⁻, this result improves on the current best upper limit by an order of magnitude.
October 16, 2025 at 8:54 AM
Searches for B⁰→K⁺π⁻τ⁺τ⁻ and Bₛ⁰→K⁺K⁻τ⁺τ⁻ decays arxiv.org/abs/2510.13716 - This is he first limit for the Bₛ⁰→K⁺K⁻τ⁺τ⁻ decay. For the decay B⁰→K*(892)⁰τ⁺τ⁻, this result improves on the current best upper limit by an order of magnitude.
Study of charm mixing and CP violation with D⁰→K⁺π⁻π⁺π⁻ decays arxiv.org/abs/2510.04963 - It is found that x=(0.85+0.15−0.24)%, y=(0.21+0.29−0.27)%, Δx=(−0.02±0.04)% and Δy=(0.02+0.04−0.03)%. These results are consistent with previous measurements and the hypothesis of CP conservation.
October 7, 2025 at 5:57 AM
Study of charm mixing and CP violation with D⁰→K⁺π⁻π⁺π⁻ decays arxiv.org/abs/2510.04963 - It is found that x=(0.85+0.15−0.24)%, y=(0.21+0.29−0.27)%, Δx=(−0.02±0.04)% and Δy=(0.02+0.04−0.03)%. These results are consistent with previous measurements and the hypothesis of CP conservation.
Measurement of the W→μν cross-sections as a function of the muon transverse momentum in pp collisions at 5.02 TeV arxiv.org/abs/2509.18817 - This analysis introduces a new method to determine the W-boson mass using the measured differential cross-sections corrected for detector effects.
September 24, 2025 at 6:26 AM
Measurement of the W→μν cross-sections as a function of the muon transverse momentum in pp collisions at 5.02 TeV arxiv.org/abs/2509.18817 - This analysis introduces a new method to determine the W-boson mass using the measured differential cross-sections corrected for detector effects.
This is the 800th LHCb paper. 🎉
First evidence of CP violation in beauty baryon to charmonium decays arxiv.org/abs/2509.16103 - The difference in the CP asymmetries between Λ⁰b→J/ψpπ⁻ and Λ⁰b→J/ψKπ⁻ decays is measured to be ΔACP=(4.0±1.2±0.2)%.
September 23, 2025 at 6:08 AM
This is the 800th LHCb paper. 🎉
Observation of Bc⁺→D⁺h⁺h⁻decays arxiv.org/abs/2509.15873 - The decays Bc⁺→D⁺K⁺π⁻, Bc⁺→D*⁺K⁺π⁻ and Bc⁺→Dₛ⁺K⁺K⁻ are observed for the first time.
September 22, 2025 at 6:17 AM
Observation of Bc⁺→D⁺h⁺h⁻decays arxiv.org/abs/2509.15873 - The decays Bc⁺→D⁺K⁺π⁻, Bc⁺→D*⁺K⁺π⁻ and Bc⁺→Dₛ⁺K⁺K⁻ are observed for the first time.
First evidence of CP violation in beauty baryon to charmonium decays arxiv.org/abs/2509.16103 - The difference in the CP asymmetries between Λ⁰b→J/ψpπ⁻ and Λ⁰b→J/ψKπ⁻ decays is measured to be ΔACP=(4.0±1.2±0.2)%.
September 22, 2025 at 6:12 AM
First evidence of CP violation in beauty baryon to charmonium decays arxiv.org/abs/2509.16103 - The difference in the CP asymmetries between Λ⁰b→J/ψpπ⁻ and Λ⁰b→J/ψKπ⁻ decays is measured to be ΔACP=(4.0±1.2±0.2)%.
A model-independent measurement of the CKM angle γ in the decays B⁺→[K⁺K⁻π⁺π⁻]h⁺ and B⁺→[π⁺π⁻π⁺π⁻]h⁺ (h=K,π) arxiv.org/abs/2509.15139 - The result of this binned analysis is γ=(53.9+9.5−8.9)∘, where the uncertainty includes both statistical and systematic contributions.
September 19, 2025 at 6:17 AM
A model-independent measurement of the CKM angle γ in the decays B⁺→[K⁺K⁻π⁺π⁻]h⁺ and B⁺→[π⁺π⁻π⁺π⁻]h⁺ (h=K,π) arxiv.org/abs/2509.15139 - The result of this binned analysis is γ=(53.9+9.5−8.9)∘, where the uncertainty includes both statistical and systematic contributions.
Measurement of the branching fraction of the Λb⁰→J/ψΛ decay and isospin asymmetry of B→J/ψK decays arxiv.org/abs/2509.12805 - B(Λb⁰→J/ψΛ)=(3.34±0.02±0.10±0.08±0.28)×10−4. In addition, the isospin asymmetry between the rates of B⁰→J/ψK⁰s and B⁺→J/ψK+ decays is measured to be AI=−0.0135±0.0004±0.0133.
September 17, 2025 at 5:51 AM
Measurement of the branching fraction of the Λb⁰→J/ψΛ decay and isospin asymmetry of B→J/ψK decays arxiv.org/abs/2509.12805 - B(Λb⁰→J/ψΛ)=(3.34±0.02±0.10±0.08±0.28)×10−4. In addition, the isospin asymmetry between the rates of B⁰→J/ψK⁰s and B⁺→J/ψK+ decays is measured to be AI=−0.0135±0.0004±0.0133.
Amplitude analysis of B⁰→ηc(1S)K⁺π⁻ decays arxiv.org/abs/2509.03133 - The data are described with a model including only intermediate contributions from known K*⁰ resonances. Evidence for an exotic resonance in the ηcπ⁻ system, reported in a previous analysis of this decay channel, is not confirmed.
September 4, 2025 at 5:43 AM
Amplitude analysis of B⁰→ηc(1S)K⁺π⁻ decays arxiv.org/abs/2509.03133 - The data are described with a model including only intermediate contributions from known K*⁰ resonances. Evidence for an exotic resonance in the ηcπ⁻ system, reported in a previous analysis of this decay channel, is not confirmed.
Inclusive B-meson flavour-tagging algorithm at LHCb arxiv.org/abs/2508.20180 - This new algorithm improves the tagging power by 35% for B0 mesons and 20% for B0s mesons when compared to the combined performance of the existing LHCb flavour-tagging algorithms.
August 29, 2025 at 4:57 AM
Inclusive B-meson flavour-tagging algorithm at LHCb arxiv.org/abs/2508.20180 - This new algorithm improves the tagging power by 35% for B0 mesons and 20% for B0s mesons when compared to the combined performance of the existing LHCb flavour-tagging algorithms.
Measurement of branching fractions and CP asymmetries in Λb⁰(Ξb⁰)→pKs⁰h⁻ decays arxiv.org/abs/2508.17836 - The decays Λb⁰ and Ξb⁰→pKs⁰K⁻ are observed for the first time. No evidence of CP violation is observed.
August 26, 2025 at 5:43 AM
Measurement of branching fractions and CP asymmetries in Λb⁰(Ξb⁰)→pKs⁰h⁻ decays arxiv.org/abs/2508.17836 - The decays Λb⁰ and Ξb⁰→pKs⁰K⁻ are observed for the first time. No evidence of CP violation is observed.
First observation of the charmless baryonic decay B⁺→Λ̅pp̅p arxiv.org/abs/2508.16259 - The branching fraction for this decay is measured for the first time, as (2.08±0.34±0.12±0.26)×10⁻⁷. The mass distributions of Λ̅p and p̅p pairs exhibit pronounced enhancements at both kinematic thresholds.
August 25, 2025 at 5:48 AM
First observation of the charmless baryonic decay B⁺→Λ̅pp̅p arxiv.org/abs/2508.16259 - The branching fraction for this decay is measured for the first time, as (2.08±0.34±0.12±0.26)×10⁻⁷. The mass distributions of Λ̅p and p̅p pairs exhibit pronounced enhancements at both kinematic thresholds.
First observation of CP violation and measurement of polarization in B⁺→ρ(770)⁰K*(892)⁺ decays arxiv.org/abs/2508.13563 - The CP asymmetry is measured to be 0.507±0.062)±0.017 and the CP-averaged longitudinal polarization fraction 0.720±0.028±0.009.
August 20, 2025 at 6:03 AM
First observation of CP violation and measurement of polarization in B⁺→ρ(770)⁰K*(892)⁺ decays arxiv.org/abs/2508.13563 - The CP asymmetry is measured to be 0.507±0.062)±0.017 and the CP-averaged longitudinal polarization fraction 0.720±0.028±0.009.
Deuteron identification via time of flight with LHCb arxiv.org/abs/2508.06305 - The timing capabilities of the LHCb detector operated during the LHC Run 2 can be used to identify light ion particles with momenta of a few GeV/c.
August 11, 2025 at 7:14 AM
Deuteron identification via time of flight with LHCb arxiv.org/abs/2508.06305 - The timing capabilities of the LHCb detector operated during the LHC Run 2 can be used to identify light ion particles with momenta of a few GeV/c.
Reposted by LHCb Experiment
#LHCbpaper: Measurement of transverse Λ and Λ̅ hyperon polarisation in pPb collisions at √(s_NN) = 5.02 TeV (arXiv:2508.02009) https://arxiv.org/abs/2508.02009
August 6, 2025 at 3:04 AM
#LHCbpaper: Measurement of transverse Λ and Λ̅ hyperon polarisation in pPb collisions at √(s_NN) = 5.02 TeV (arXiv:2508.02009) https://arxiv.org/abs/2508.02009
Reposted by LHCb Experiment
#LHCbpaper: Amplitude analysis of the Ξ⁺_c → pK⁻π⁺ decay and Ξ⁺_c baryon polarization measurement in semileptonic beauty-hadron decays (arXiv:2508.00492) https://arxiv.org/abs/2508.00492
August 5, 2025 at 3:03 AM
#LHCbpaper: Amplitude analysis of the Ξ⁺_c → pK⁻π⁺ decay and Ξ⁺_c baryon polarization measurement in semileptonic beauty-hadron decays (arXiv:2508.00492) https://arxiv.org/abs/2508.00492