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LHCb Preprints

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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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2026-05-08
04:01
Observation of the charmless purely baryonic decay $\mathinner{\mathitΛ^0_b\!\to \mathitΛ p \overline{p}}$ / LHCb Collaboration
A search for the charmless purely baryonic decay $\mathinner{\mathitΛ^0_b\!\to \mathitΛ p \overline{p}}$ 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. - 25.
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2026-05-07
14:00
Observation of the charmless purely baryonic decay $\mathinner{\mathit{\Lambda}^0_b\!\to \mathit{\Lambda} p \overline{p}}$
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 $6.0\,\text{fb}^{-1}$ [...]
CERN-EP-2026-123 ; arXiv:2605.04348 ; LHCB-PAPER-2026-004. - 2026
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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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2026-04-27
09:18
Observation of a new excited charm-strange meson $D_{s1}(2933)^+$ in $B^0 \to D^+D^-K^+\pi^-$ decays / LHCb Collaboration
A new excited charm-strange meson is observed through an amplitude analysis of the full phase space of $B^0\to D^+ D^- K^+ \pi^-$ decays. [...]
arXiv:2604.21257 ; LHCb-PAPER-2025-073 ; CERN-EP-2026-065 ; LHCB-PAPER-2025-073. - 2026 - 24.
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2026-04-22
16:32
Observation of the doubly charmed baryon $\it{\Xi}_{cc}^+$ with the LHCb Run 3 detector / LHCb Collaboration
The first observation of the doubly charmed baryon $\it{\Xi}_{cc}^+$ is reported through its decay to the $\it{\Lambda}_c^+ K^-\pi^+$ final state, with a statistical significance exceeding seven standard deviations. [...]
arXiv:2603.28456 ; LHCb-PAPER-2026-009 ; CERN-EP-2026-085 ; LHCB-PAPER-2026-009. - 2026 - 24.
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