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EP Preprints

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2026-04-30
11:47
First evidence of the decay $B^+ \to \pi^+ e^+ e^-$
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$^{-1}$. [...]
CERN-EP-2026-055 ; arXiv:2604.26784 ; LHCB-PAPER-2025-050. - 2026
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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
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. [...]
CERN-EP-2026-065 ; arXiv:2604.21257 ; LHCB-PAPER-2025-073. - 2026
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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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2026-04-20
11:02
Study of the $B^0\to \Lambda_c^+ \bar\Lambda_c^- K^0_S$ decay / LHCb Collaboration
The decay $B^0 \to \Lambda_c^+ \bar{\Lambda}_c^- K_S^0$ is studied at LHCb for the first time using proton-proton collision data recorded by the LHCb experiment at a center-of-mass energy of $\sqrt{s} = 13$ TeV, corresponding to an integrated luminosity of 5.4 fb$^{-1}$. [...]
arXiv:2604.15040 ; LHCb-PAPER-2025-072 ; CERN-EP-2026-073 ; LHCB-PAPER-2025-072. - 2026 - 22.
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2026-04-15
12:11
Precision measurement of the muon charge asymmetry from $W$-boson decays in $pp$ collisions at $\sqrt{s}$ = 13 TeV in the forward region / LHCb Collaboration
A precision measurement of the muon charge asymmetry from $W$-boson decays in proton-proton collisions at $\sqrt{s}$ = 13 TeV is presented. [...]
arXiv:2604.12593 ; LHCb-PAPER-2025-071 ; CERN-EP-2026-084 ; LHCB-PAPER-2025-071. - 2026 - 19.
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2026-04-15
11:54
Measurement of the $W$-boson production cross-sections in $pp$ collisions at $\sqrt{s}$ = 13 TeV in the forward region. / LHCb Collaboration
A precision measurement of the $W$-boson production cross-section is performed using the $W \to \mu\nu$ decay channel, based on a sample of proton-proton collision data collected by the LHCb experiment at $\sqrt{s}$ = 13 TeV and corresponding to an integrated luminosity of 5.1 $fb^{-1}$. [...]
arXiv:2604.12706 ; LHCb-PAPER-2025-070 ; CERN-EP-2026-083 ; LHCB-PAPER-2025-070. - 2026 - 31.
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2026-04-14
14:12
Measurement of inclusive production of charmonium states in $b$-hadron decays via their decay into $\phi\phi$ / LHCb Collaboration
The inclusive production of the $\eta_c(1S)$, $\eta_c(2S)$ and $\chi_{c}$ charmonium states in $b$-hadron decays is studied with LHCb Run~2 data, corresponding to an integrated luminosity of $5.9~\text{fb}^{-1}$, using charmonia decays to $\phi\phi$ pairs. [...]
arXiv:2604.11123 ; LHCb-PAPER-2025-058 ; CERN-EP-2026-058 ; LHCB-PAPER-2025-058. - 2026 - 26.
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2026-04-13
11:25
Search for the lepton-flavour violating decays $B^+\to \pi^+ \mu^\pm e^\mp$ / LHCb Collaboration
The first search for the lepton-flavour violating decays $B^+ \to \pi^+ \mu^{\pm} e^{\mp}$ in proton-proton collisions is presented, using data collected by the LHCb experiment between 2011 and 2018, corresponding to an integrated luminosity of 9 fb$^{-1}$. [...]
arXiv:2604.08396 ; LHCb-PAPER-2026-013 ; CERN-EP-2026-093 ; LHCB-PAPER-2026-013. - 2026 - 21.
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2026-04-07
14:41
Precise measurement of the CKM angle $\gamma$ with a novel approach / LHCb Collaboration
A measurement of the CKM angle $\gamma$ is performed by applying a novel, unbinned, model-independent approach to datasets of electron-positron collisions collected by the BESIII experiment and proton-proton collisions by the LHCb experiment, corresponding to integrated luminosities of 8 fb$^{-1}$ and 9 fb$^{-1}$, respectively. The $C\!P$-violating phase $\gamma$ is determined from ${B^{\pm}\rightarrow D(\rightarrow K_{\rm S}^{0} h^{\prime+}h^{\prime-}) h^{\pm}}$ decays in LHCb data, where $h^{(\prime)}$ is either a pion or kaon, while the corresponding strong-phase parameters are measured using doubly tagged ${D\rightarrow K_{\rm S/L}^0 h^{\prime+} h^{\prime-}}$ decays in the quantum-correlated $D\overline{D}$ system present in BESIII data. [...]
arXiv:2604.05712; LHCb-PAPER-2025-064; CERN-EP-2026-068.- Geneva : CERN, 2026 - 28 p. Fulltext: 5d420987-4c54-4708-8e5b-f9e391da0a97 - PDF; 2604.05712 - PDF; Related data file(s): ZIP; External link: Submit a comment

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