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EP Preprints

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2025-08-29
09:01
Inclusive $B$-meson flavour-tagging algorithm at LHCb / LHCb Collaboration
A new algorithm is developed to identify the flavour of neutral $B$ mesons at production in $pp$ collisions by utilising all tracks from the hadronisation process. [...]
arXiv:2508.20180 ; LHCB-PAPER-2025-024 ; CERN-EP-2025-168 ; LHCB-PAPER-2025-024. - 2025 - 32.
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2025-08-26
13:37
Measurement of branching fractions and $C\!P$ asymmetries in $\mathit{\Lambda}_b^0(\mathit{\Xi}_b^0)\!\to pK_{\mathrm S}^0h^-$ decays / LHCb Collaboration
A study of $\mathit{\Lambda}_b^0$ and $\mathit{\Xi}_b^0$ baryon decays to the final states $pK_{\mathrm S}^0\pi^-$ and $pK_{\mathrm S}^0K^-$ is performed using $pp$ collision data collected by the LHCb experiment, corresponding to an integrated luminosity of $9\,\mathrm{fb}^{-1}$. [...]
arXiv:2508.17836 ; LHCb-PAPER-2025-016 ; CERN-EP-2025-158 ; LHCB-PAPER-2025-016. - 2025 - 27.
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2025-08-25
09:55
First observation of the charmless baryonic decay $B^+\to \bar{\Lambda}p\bar{p}p$ / LHCb Collaboration
A search for the charmless baryonic decay $B^+\to \bar{\Lambda} p\bar{p}p$ is performed using proton-proton collision data recorded by the LHCb experiment, corresponding to an integrated luminosity of 5.4 $\rm{fb}^{-1}$. [...]
arXiv:2508.16259 ; LHCb-PAPER-2025-032 ; CERN-EP-2025-174 ; LHCB-PAPER-2025-032. - 21.
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2025-08-20
09:20
First observation of $C\!P$ violation and measurement of polarisation in $B^+ \to \rho(770)^0 K^*(892)^+$ decays / LHCb Collaboration
An amplitude analysis of the $B^+\to(\pi^+\pi^-)(K^0_{\mathrm{S}}\pi^+)$ decay is performed in the mass regions $0.30 < m_{\pi^+\pi^-} < 1.10\,\mathrm{GeV}/c^2$ and $0.75 < m_{K^0_{\mathrm{S}}\pi^+} < 1.20\,\mathrm{GeV}/c^2$, using $pp$ collision data recorded with the LHCb detector corresponding to an integrated luminosity of $9\,\mathrm{fb}^{-1}$. [...]
arXiv:2508.13563 ; LHCb-PAPER-2025-026 ; CERN-EP-2025-171 ; LHCB-PAPER-2025-026. - 2025 - 27.
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2025-08-04
15:07
Amplitude analysis of the $\Xi^+_c\to pK^-\pi^+$ decay and $\Xi^+_c$ baryon polarization measurement in semileptonic beauty-hadron decays / LHCb Collaboration
An amplitude analysis of the $\Xi^+_c\to pK^-\pi^+$ decay together with a measurement of the $\Xi^+_c$ polarization vector in semileptonic beauty-hadron decays is presented. [...]
arXiv:2508.00492 ; LHCb-PAPER-2024-034 ; CERN-EP-2024-320. - 2025 - 38.
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2025-07-21
13:54
Improved measurement of $\eta / \eta^{\prime}$ mixing in $B^{0}_{(s)} \rightarrow J/\psi \eta^{(\prime)}$ decays / LHCb Collaboration
Branching fraction ratios between the decays $B^{0}_{(s)} \rightarrow J/\psi \eta^{(\prime)}$ are measured 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:2507.13914 ; LHCb-PAPER-2025-025 ; CERN-EP-2025-148 ; LHCB-PAPER-2025-025. - 2025-07-18 - 32.
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2025-07-21
09:53
Measurement of the $\ B^0 \to \rho(770)^0 \gamma \ $ branching fraction / LHCb Collaboration
The ratio between the branching fractions of the $B^0\to\rho(770)^0\gamma$ and $B^0\to K^{*}(892)^0\gamma$ decays is measured with 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:2507.14401 ; LHCb-PAPER-2025-017 ; CERN-EP-2025-144 ; LHCB-PAPER-2025-017. - 2025 - 21.
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2025-07-21
08:55
Search for resonances decaying to photon pairs with masses between 4.9 and 19.4 GeV / LHCb Collaboration
A search is presented for axion-like particles (ALPs) with masses between 4.9 and 19.4 GeV decaying to a pair of photons, using proton-proton collisions collected with the LHCb detector during 2018 at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 2.1 fb$^{-1}$. [...]
arXiv:2507.14390 ; CERN-EP-2025-133 ; LHCb-PAPER-2025-012 ; LHCB-PAPER-2025-012. - 2025 - 21.
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2025-07-17
16:47
Precision measurement of the ${\it{\Xi}}_b^0$ baryon lifetime / LHCb Collaboration
A sample of $pp$ collision data, corresponding to an integrated luminosity of 5.4 fb$^{-1}$ and collected by the LHCb experiment during LHC Run 2, is used to measure the ratio of the lifetime of the ${\it{\Xi}}_b^0$ baryon to that of the ${\it{\Lambda}}_b^0$ baryon, $r_{\tau}\equiv\tau_{{\it{\Xi}}_b^0}/\tau_{{\it{\Lambda}}_b^0}$. [...]
arXiv:2507.12402 ; LHCb-PAPER-2025-023 ; CERN-EP-2025-139. - 2025 - 25.
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2025-07-15
10:24
First observation of the $\mathit{\Lambda}_b^{0}\!\rightarrow\mathit{\Lambda}_{c}^{+}D_{s}^{-}K^{+}K^{-}$ decay and search for pentaquarks in the $\mathit{\Lambda}_{c}^{+}D_{s}^{-}$ system / LHCb Collaboration
The $\mathit{\Lambda}_b^{0}\!\rightarrow\mathit{\Lambda}_{c}^{+}D_{s}^{-}K^{+}K^{-}$ decay is observed for the first time using the data sample from proton-proton collisions recorded at a center-of-mass energy of $13\,\text{TeV}$ with the LHCb detector, corresponding to an integrated luminosity of $6\,\text{fb}^{-1}$. [...]
arXiv:2507.10713 ; LHCb-PAPER-2025-022 ; CERN-EP-2025-138 ; LHCB-PAPER-2025-022. - 2025 - 24.
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