Test of lepton flavour universality using B⁰ → D*⁻τ⁺ν decays with hadronic τ channels https://arxiv.org/abs/2305.01463 - The lepton universality test R(D*⁻)≡B(B⁰ → D*⁻τ⁺ν)/B(B⁰ → D*⁻μ+ν) is calculated as 0.247±0.015±0.015±0.012.
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Test of lepton flavour universality using B⁰ → D*⁻τ⁺ν decays with hadronic τ channels https://arxiv.org/abs/2305.01463 - The lepton universality test R(D*⁻)≡B(B⁰ → D*⁻τ⁺ν)/B(B⁰ → D*⁻μ+ν) is calculated as 0.247±0.015±0.015±0.012.
Study of charmonium decays to K⁰s Kπ in the B → (K⁰sKπ)K channels https://arxiv.org/abs/2304.14891 - New precise measurements of the ηc and ηc(2S) resonance parameters are performed. The first observation and branching fraction measurement of B+→χc0K0π+ is reported.
D*(2007)⁰→μ⁺μ⁻ in B⁻→π⁻μ⁺μ⁻ decays https://arxiv.org/abs/2304.01981 - This is the first limit on the branching fraction of D*(2007)⁰→μ⁺μ⁻ and the first search for a rare charm-meson decay exploiting production via beauty decays.
Observation of the B⁺→J/ψη′K⁺ decay https://arxiv.org/abs/2303.09443 - The branching fraction of this decay is measured relative to the known branching fraction of the B⁺→ψ(2S)K⁺ decays and found to be (4.91±0.47±0.29±0.07)×10⁻².
Search for CP violation in D⁺ and Ds⁺→K⁻K⁺K⁺ decays. The results are given as p-values for the hypothesis of CP conservation and are found to be 13.3% for the Ds⁺→K⁻K⁺K⁺ decay and 31.6% for the D⁺→K⁻K⁺K⁺ decay.
Observation of the Bₛ⁰→χc1(3872)π⁺π⁻ decay https://arxiv.org/abs/2302.10629 - The first observation is reported. The mass spectrum of the π⁺π⁻ system recoiling against the χc1(3872) meson exhibits a large contribution from f₀ mesons.
Measurement of the Λb⁰→Λ(1520)μ⁺μ⁻ differential branching fraction https://arxiv.org/abs/2302.08262 - The result in the highest q² interval, q²>15.0 GeV², where theoretical predictions have the smallest model dependence, agrees with the predictions.
Measurement of the Λb⁰→Λ(1520)μ⁺μ⁻ differential branching fraction https://arxiv.org/abs/2302.08262 - The result in the highest q² interval, q²>15.0 GeV², where theoretical predictions have the smallest model dependence, agrees with the predictions.
Observation of new Ωc⁰ states decaying to the Ξc⁺K⁻ final state https://arxiv.org/abs/2302.04733 - Two new excited states, Ωc(3185) and Ωc(3327), are observed
Measurement of the ratios of branching fractions R(D∗) and R(D⁰) https://arxiv.org/abs/2302.02886 - The ratios of branching fractions B(B̅→D*τ⁻ν̅)/B(B̅→D*μ⁻ν̅) and B(B̅→D⁰τ⁻ν̅)/B(B̅→D⁰μ⁻ν̅) are measured as 0.281±0.018±0.024 and 0.441±0.060±0.066, respectively.
A study of CP violation in the decays B⁺→[K⁺K⁻π⁺π⁻]_D h⁺ (h = K, π) and B⁺→[π⁺π⁻π⁺π⁻]_D h⁺ https://arxiv.org/abs/2301.10328 - The analysis is performed in bins of phase space. The angle γ of the Unitarity Triangle are determined.
A study of CP violation in the decays B⁺→[K⁺K⁻π⁺π⁻]_D h⁺ (h = K, π) and B⁺→[π⁺π⁻π⁺π⁻]_D h⁺ https://arxiv.org/abs/2301.10328 - The analysis is performed in bins of phase space, which are optimised for sensitivity to local CP asymmetries. The angle γ of the Unitarity Triangle are determined.
Λc⁺ polarimetry using the dominant hadronic mode https://arxiv.org/abs/2301.07010 - Using a recent amplitude analysis of the Λ+c→pK−π+ decay performed at the LHCb experiment, we compute the distribution of the kinematic-dependent polarimeter vector.
Evidence of a J/ψKs⁰ structure in B⁰→J/ψϕKs⁰ decays https://arxiv.org/abs/2301.04899 - Evidence of a J/ψKs⁰ structure is seen. The state is likely to be the isospin partner of a state previously observed in the J/ψK⁺ system of the B⁺→J/ψϕK⁺ decay.
Measurement of Υ production in pp collisions at √s=5 TeV https://arxiv.org/abs/2212.12664 - Double differential cross-sections times branching fractions, as functions of the transverse momentum and the rapidity y of the Υ mesons, are measured in the range pT<20 GeV/c and 2.0<y<4.5.
Search for rare decays of D⁰ mesons into two muons https://arxiv.org/abs/2212.11203 - An upper limit on the branching fraction of this decay is set at B(D⁰→μ⁺μ⁻)<3.1× 10⁻⁹ at a 90% CL, the world's most stringent limit.
Test of lepton universality in b→sℓ⁺ℓ⁻ decays https://arxiv.org/abs/2212.09152 - Each of the four lepton universality measurements reported is either the first or supersedes previous LHCb measurements. The results are compatible with the predictions of the Standard Model.
Test of lepton universality in b→sℓ⁺ℓ⁻ decays https://arxiv.org/abs/2212.09152 https://arxiv.org/abs/2212.09153 - Each of the four lepton universality measurements reported is either the first or supersedes previous LHCb measurements. The results are compatible with the predictions of the Standard Model.
Today seminar on "Measurements of 𝑅(𝐾) and 𝑅(𝐾∗) with the full LHCb Run 1 and 2 data" at 11h CET with webcast https://indico.cern.ch/event/1187945/
Today seminar by @QuaglianiRenato@twitter.com "Measurements of 𝑅(𝐾) and 𝑅(𝐾∗) with the full LHCb Run 1 and 2 data" at 11h CET with webcast https://indico.cern.ch/event/1187945/