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EP Preprints

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2025-05-07
16:32
Measurement of the branching fraction ratio $R_K$ at large dilepton invariant mass / LHCb Collaboration
A test of lepton universality between muons and electrons is performed using $B^+ \rightarrow K^+\ell^+\ell^-$ decays (where $\ell = e$, $\mu$), in the dilepton invariant-mass-squared region above 14.3 GeV$^2/c^4$. [...]
arXiv:2505.03483 ; LHCb-PAPER-2024-056 ; CERN-EP-2025-069. - 2025 - 37.
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2025-04-30
10:10
Observation of the decay $B_s^0 \to K_S^0 p \bar{p}$ and measurement of the $B_{(s)}^0 \to K_S^0 p\bar{p}$ branching fraction / LHCb Collaboration
A study of the charmless baryonic decays $B^0_{(s)}\rightarrow K^0 p \bar{p}$ is presented, where $B^0_{(s)}$ denotes either a $B^0$ or a $B^0_s$ meson. [...]
arXiv:2504.21269 ; LHCb-PAPER-2025-001 ; CERN-EP-2025-085. - 2025 - 26.
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2025-04-10
15:16
Angular analysis of the decay $B_s^0 \to \phi e^+e^-$ / LHCb Collaboration
An angular analysis of the decay $B^0_s\to\phi e^+e^-$ is presented, using proton-proton collision data collected with the LHCb detector between 2011 and 2018 at centre-of-mass energies of 7, 8 and 13$\,\mathrm{Te\kern -0.1em V}$. [...]
arXiv:2504.06346 ; LHCb-PAPER-2025-006 ; CERN-EP-2025-064 ; LHCB-PAPER-2025-006. - 2025 - 29.
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2025-04-08
17:10
Observation of the very rare $\Sigma^+ \to p \mu^+ \mu^-$ decay / LHCb Collaboration
The first observation of the $\Sigma^+ \to p \mu^+ \mu^-$ decay is reported with high significance using proton-proton collision data, corresponding to an integrated luminosity of $5.4\,\rm{fb}^{-1}$, collected with the LHCb detector at a centre-of-mass energy of 13~TeV. [...]
arXiv:2504.06096 ; LHCb-PAPER-2025-002 ; CERN-EP-2025-074. - 2025 - 27.
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2025-04-08
13:48
Observation of the doubly-charmed-baryon decay $\Xi_{cc}^{++} \to \Xi_c^0 \pi^+ \pi^+$ / LHCb Collaboration
A search for the doubly-charmed-baryon decay ${\it \Xi}_{cc}^{++}\to{\it \Xi}_{c}^{0}(\to p K^{-}K^{-}\pi^{+})\pi^{+}\pi^{+}$ is performed using proton-proton collision data collected by the LHCb experiment at a centre-of-mass energy of 13 TeV and corresponding to an integrated luminosity of $5.4 {\,fb}^{-1}$. [...]
arXiv:2504.05063 ; LHCb-PAPER-2024-053 ; CERN-EP-2025-047 ; LHCB-PAPER-2024-053. - 2025 - 23.
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2025-04-02
15:59
Search for the $B^+_c\rightarrow \chi_{c1}(3872)\pi^+$ decay / LHCb Collaboration
A search for the decay $B^+_c\rightarrow \chi_{c1}(3872)\pi^+$ is reported using proton-proton collision data collected with the LHCb detector between 2011 and 2018 at centre-of-mass energies of 7, 8, and 13 $TeV$, corresponding to an integrated luminosity of $9fb^{-1}$. [...]
arXiv:2503.20039 ; CERN-EP-2025-042 ; LHCb-PAPER-2024-050 ; LHCB-PAPER-2024-050. - 2025 - 29.
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2025-03-25
16:29
Observation of charge-parity symmetry breaking in baryon decays / LHCb Collaboration
The Standard Model of particle physics, the theory of particles and interactions at the smallest scale, predicts that matter and antimatter interact differently due to violation of the combined symmetry of charge conjugation ($C$) and parity ($P$). [...]
arXiv:2503.16954 ; LHCb-PAPER-2024-054 ; CERN-EP-2025-031 ; LHCB-PAPER-2024-054. - 2025 - 29.
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2025-03-11
08:43
Branching fraction measurement of the decay $B^+ \to \psi(2S) \phi(1020) K^+$ / LHCb Collaboration
The branching fraction of the decay $B^+\to \psi(2S)\phi(1020)K^+$, relative to the topologically similar decay $B^+\to J/\psi \phi(1020) K^+$, is measured using proton-proton collision data collected by the LHCb experiment at center-of-mass energies of 7, 8, and 13 TeV, corresponding to an integrated luminosity of $9\,\mathrm{fb}^{-1}$. [...]
arXiv:2503.02711 ; LHCb-PAPER-2024-039 ; CERN-EP-2025-011. - 2025 - 22.
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2025-02-26
11:23
Observation of a new charmed baryon decaying to $\Xi_c^+ \pi^+ \pi^-$ / LHCb Collaboration
The $\Xi^+_c\pi^-\pi^+$ spectrum is investigated using proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.4 fb$^{-1}$, collected by the LHCb experiment during 2016-2018. [...]
arXiv:2502.18987 ; LHCb-PAPER-2024-055 ; CERN-EP-2025-019 ; LHCB-PAPER-2024-055. - 2025 - 22.
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2025-02-17
10:35
Angular analysis of $B^0 \to K^{*0} e^+e^-$ decays / LHCb Collaboration
An angular analysis of $B^0\rightarrow K^{*0}e^{+}e^{-}$ decays is presented using proton-proton collision data collected 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:2502.10291 ; LHCb-PAPER-2024-022 ; CERN-EP-2025-001. - 2025 - 61.
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