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LHCb Preprints

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2026-06-11
04:32
Measurement of the ratio of branching fractions $\mathcal{B}(B_c^+ \to J/ψτ^+ ν_τ)/\mathcal{B}(B_c^+ \to J/ψμ^+ ν_μ)$ / LHCb Collaboration
A measurement of the ratio of semileptonic branching fractions $\mathcal{R}(Jψ)$, defined as $\mathcal{R}(J/ψ) \equiv \mathcal{B}(B_c^+ \to J/ψτ^+ ν_τ)/\mathcal{B}(B_c^+ \to J/ψμ^+ ν_μ)$, is reported using a sample of proton-proton collision data corresponding to an integrated luminosity of 5.4 fb$^{-1}$ recorded by the LHCb experiment in 2016--2018 at a center-of-mass energy of 13 TeV. [...]
arXiv:2606.10018 ; LHCb-PAPER-2026-018 CERN-EP-2026-152 ; CERN-EP-2026-152 ; LHCb-PAPER-2026-018. - 19.
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2026-06-06
06:48
Associated $Z$ + $J/\psi$ production as a probe of multiparton interactions in the forward region / LHCb Collaboration
This letter reports a study of associated $Z$ boson and prompt $J/ψ$ production in proton-proton collisions at $\sqrt{s}=13$ TeV with the LHCb detector in the forward rapidity region, using a data sample taken during 2016 to 2018 corresponding to an integrated luminosity of $5.1 \mathrm{fb}^{-1}$. [...]
arXiv:2606.05786 ; LHCb-PAPER-2025-054 ; CERN-EP-2026-145. - 2026 - 26.
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2026-05-27
09:55
Study of nuclear effects in charm production in light-ion collisions / LHCb Collaboration
The onset of nuclear effects in light-ion collisions is studied by measuring the ratio of $D^0$ meson production between NeNe and OO collisions at a center-of-mass energy per nucleon pair of $5.36\,{\rm TeV}$ recorded by the LHCb detector. [...]
arXiv:2605.27273 ; LHCb-PAPER-2026-008 ; CERN-EP-2026-141 ; LHCB-PAPER-2026-008. - 2026 - 19 p, 19.
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2026-05-20
04:23
Flavour Changing Neutral Current decays at LHCb / Langenbruch, Christoph (Heidelberg U.)
Flavour Changing Neutral Current (FCNC) decays are forbidden at lowest perturbative order in the Standard Model (SM) and only allowed via quantum loops. [...]
arXiv:2605.18084. - 6.
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2026-05-12
04:12
$C\!P$ violation analysis of local and nonlocal amplitudes in the $\overline{B}^0 \to \overline{K}^{*0}μ^+μ^-$ decay / LHCb Collaboration
A search for $C\!P$ violation in the $\overline{B}^0 \to \overline{K}^{*0}μ^+μ^-$ decay is performed using proton--proton collision data collected by the LHCb experiment during Run 1 and Run 2, corresponding to an integrated luminosity of 8.4 fb$^{-1}$. [...]
arXiv:2605.07582 ; LHCb-PAPER-2026-007 ; CERN-EP-2026-114. - 19.
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2026-05-11
10:40
Evidence for the decay $B_s^0\to \phi \eta^\prime$ / LHCb Collaboration
Using a dataset corresponding to an integrated luminosity of $9 \,\textrm{fb}^{-1}$ collected in proton-proton collisions between 2011 and 2018 by the LHCb experiment, evidence is found for the decay $B^0_s\rightarrow\phi\eta'$ with $3.5 \sigma$ significance. [...]
arXiv:2605.07586 ; LHCb-PAPER-2026-002 ; CERN-EP-2026-104 ; LHCB-PAPER-2026-002. - 2026 - 20.
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2026-05-07
14:00
Observation of the charmless purely baryonic decay $\mathinner{\mathit{\Lambda}^0_b\!\to \mathit{\Lambda} p \overline{p}}$ / LHCb Collaboration
A search for the charmless purely baryonic decay $\mathinner{\mathit{\Lambda}^0_b\!\to \mathit{\Lambda} p \overline{p}}$ is performed using proton-proton collision data recorded by the LHCb experiment at a centre-of-mass energy of $\sqrt{s}=13\,\text{TeV}$ and corresponding to an integrated luminosity of $6.0\,\text{fb}^{-1}$ [...]
arXiv:2605.04348 ; LHCb-PAPER-2026-004 ; CERN-EP-2026-123 ; LHCB-PAPER-2026-004. - 2026 - 25.
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2026-05-05
11:07
Measurement of $\gamma$ using $B^\pm \to D K^\pm$ and $B^\pm \to D \pi^\pm$ decays with $D \to K_{\rm S}^0 \pi^+\pi^-$ and $D \to K_{\rm S}^0 K^+K^-$ / LHCb Collaboration
A measurement of the CKM angle $\gamma$ using the decay channels $B^{\pm}\rightarrow DK^{\pm}$ and $B^{\pm}\rightarrow D\pi^{\pm}$, where the $D$ meson decays to $D\rightarrow K_{\rm S}^{0}\pi^{+}\pi^{-}$ or $D\rightarrow K_{\rm S}^{0}K^{+}K^{-}$, is performed with a data sample corresponding to an integrated luminosity of 5.8 fb$^{-1}$, collected during 2024 by the upgraded LHCb experiment. [...]
arXiv:2605.03501 ; LHCb-PAPER-2026-010 ; CERN-EP-2026-110. - 2026 - 33.
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2026-04-30
11:47
First evidence of the decay $B^+ \to \pi^+ e^+ e^-$ / LHCb Collaboration
The first evidence for the decay $B^+\to\pi^+ e^+ e^-$ is reported using proton-proton collision data recorded by the LHCb experiment at centre-of-mass energies of 7, 8 and 13 TeV, corresponding to an integrated luminosity of 9 fb$^{-1}$. [...]
arXiv:2604.26784 ; CERN-EP-2026-055 ; LHCb-PAPER-2025-050. - 2026 - 20.
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2026-04-27
12:05
Angular analysis of the $B^+ \to \pi^+ \mu^+ \mu^-$ decay / LHCb Collaboration
This paper presents the first measurement of the forward-backward asymmetry, $A_{\rm FB}$, and the flat term, $F_{H}$, that parameterise the angular distribution of the $B^+\to\pi^+\mu^+\mu^-$ decay. [...]
arXiv:2604.21987 ; CERN-EP-2026-105 ; LHCb-PAPER-2026-015 ; LHCB-PAPER-2026-015. - 2026 - 24.
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