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LHCb Experiment @lhcb.bsky.social · 18d

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.

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LHCb Experiment @lhcb.bsky.social · 18d

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.

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LHCb Experiment @lhcb.bsky.social · 19d

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.

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LHCb Experiment @lhcb.bsky.social · 28d

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.

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LHCb Experiment @lhcb.bsky.social · Sep 24

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.

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LHCb Experiment @lhcb.bsky.social · Sep 23

This is the 800th LHCb paper. 🎉

LHCb Experiment @lhcb.bsky.social · Sep 22

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)%.

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LHCb Experiment @lhcb.bsky.social · Sep 22

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.

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LHCb Experiment @lhcb.bsky.social · Sep 22

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)%.

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LHCb Experiment @lhcb.bsky.social · Sep 19

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.

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LHCb Experiment @lhcb.bsky.social · Sep 17

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.

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LHCb Experiment @lhcb.bsky.social · Sep 4

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.

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LHCb Experiment @lhcb.bsky.social · Aug 29

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.

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LHCb Experiment @lhcb.bsky.social · Aug 26

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.

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LHCb Experiment @lhcb.bsky.social · Aug 25

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.

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LHCb Experiment @lhcb.bsky.social · Aug 20

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.

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LHCb Experiment @lhcb.bsky.social · Aug 11

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.

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Reposted by LHCb Experiment

LHCb Results @lhcbpapers.bsky.social · Aug 6

#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

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Reposted by LHCb Experiment

LHCb Results @lhcbpapers.bsky.social · Aug 5

#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

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LHCb Experiment @lhcb.bsky.social · Jul 29

Search for the decay B⁰→ϕϕ arxiv.org/abs/2507.20945 - No significant signal is observed, and an upper limit on the branching fraction of 1.3 (1.4)×10⁻⁸ at 90 (95)% confidence level is set.

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LHCb Experiment @lhcb.bsky.social · Jul 22

Search for resonances decaying to photon pairs with masses between 4.9 and 19.4 GeV arxiv.org/abs/2507.14390 - Upper limits on the photon-pair branching fraction times the cross-section of ALP production are determined, as well as B(Bs⁰→γγ)<2.7×10⁻⁵, B(B⁰→γγ)<0.83×10⁻⁵ and σ(pp→ηbX)×B(ηb→γγ)<765pb.

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LHCb Experiment @lhcb.bsky.social · Jul 22

Measurement of the B⁰→ρ(770)⁰γ branching fraction arxiv.org/abs/2507.14401 - The branching fraction for is obtained as (7.9±0.3±0.2±0.2)×10⁻⁷. It is consistent with the current world-average value and by far the most precise measurement to date.

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LHCb Experiment @lhcb.bsky.social · Jul 21

Improved measurement of η/η′ mixing in B⁰ and Bs⁰→J/ψη⁽'⁾decays arxiv.org/abs/2507.13914 - The angle ϕG differs from zero by more than four standard deviations, which points to a substantial glueball component and/or unexpectedly large contributions from gluon-mediated processes in these decays.

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Reposted by LHCb Experiment

LHCb Results @lhcbpapers.bsky.social · Jul 18

#LHCbpaper: Precision measurement of the Ξ⁰_b baryon lifetime (arXiv:2507.12402) https://arxiv.org/abs/2507.12402

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Reposted by LHCb Experiment

LHCb Results @lhcbpapers.bsky.social · Jul 17

#LHCbpaper: First observation of the Λ⁰_b → Λ⁺_c D⁻_s K⁺K⁻ decay and search for pentaquarks in the Λ⁺_c D⁻_s system (arXiv:2507.10713) https://arxiv.org/abs/2507.10713

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LHCb Experiment @lhcb.bsky.social · Jul 4

Study of Bc(1P)⁺ states in the Bc⁺γ mass spectrum arxiv.org/abs/2507.02142 - Based on the predictions for the Bc(1P)⁺ spectrum, the relative production cross-section of the overall Bc(1P)⁺ states with respect to the Bc⁺ ground state is measured to be 0.20±0.03±0.02±0.03.

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