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2025-09-19
10:37
A model-independent measurement of the CKM angle $\gamma$ in the decays $B^\pm\to[K^+K^-\pi^+\pi^-]_D h^\pm$ and $B^\pm\to[\pi^+\pi^-\pi^+\pi^-]_D h^\pm$ ($h = K, \pi$) / LHCb Collaboration
A model-independent determination of the CKM angle $\gamma$ is presented, using the $B^\pm\to[K^+K^-\pi^+\pi^-]_D h^\pm$ and $B^\pm\to[\pi^+\pi^-\pi^+\pi^-]_D h^\pm$ decays, with $h=K,\pi$. This measurement is the first phase-space-binned study of these decay modes, and uses a sample of proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of $9$fb$^{-1}$ [...]
arXiv:2509.15139; LHCb-PAPER-2025-019; CERN-EP-2025-199; LHCB-PAPER-2025-019.- Geneva : CERN, 2026-01-09 - 34 p. - Published in : JHEP 2601 (2026) 062 Fulltext: LHCb-PAPER-2025-019 - PDF; 2509.15139 - PDF; document - PDF; Related data file(s): ZIP;

Detaljerad journal
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. The algorithm is calibrated separately for $B^0$ and $B^{0}_{s}$ mesons using $B^{0}\to J/\psi K^{+}\pi^-$ and $B^{0}_{s}\to D_{s}^{-}\pi^+$ decays from $pp$ collision data collected by the LHCb experiment at a centre-of-mass energy of 13\,TeV. [...]
arXiv:2508.20180; LHCB-PAPER-2025-024; CERN-EP-2025-168; LHCB-PAPER-2025-024.- Geneva : CERN, 2025-11-10 - 32 p.
Fulltext: 2508.20180 - PDF; document - PDF; Related data file(s): ZIP;

Detaljerad journal
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 $9\,\mathrm{fb}^{-1}$. The decays $\mathit{\Lambda}_b^0\!\to pK_{\mathrm S}^0K^-$ and $\mathit{\Xi}_b^0\!\to pK_{\mathrm S}^0K^-$ are observed for the first time, with significances reaching eight standard deviations. [...]
arXiv:2508.17836; LHCb-PAPER-2025-016; CERN-EP-2025-158; LHCB-PAPER-2025-016.- Geneva : CERN, 2025-10-21 - 27 p. - Published in : JHEP 2510 (2025) 169 Fulltext: 2508.17836 - PDF; document - PDF; Related data file(s): ZIP; External link: Fulltext

Detaljerad journal
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 $\rm{fb}^{-1}$. The branching fraction for this decay is measured for the first time relative to that of the topologically similar decay $B^+\to J/\psi K^+$, with $J/\psi \to \bar{\Lambda} p K^-$. [...]
arXiv:2508.16259; LHCb-PAPER-2025-032; CERN-EP-2025-174; LHCB-PAPER-2025-032.- Geneva : CERN, 2025-12-22 - 21 p. - Published in : Phys. Rev. Lett. 135 (2025) 261901 Fulltext: LHCb-PAPER-2025-032 - PDF; 2508.16259 - PDF; document - PDF; Related data file(s): ZIP;

Detaljerad journal
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 $9\,\mathrm{fb}^{-1}$. The polarization fractions and $CP$ asymmetries for $B^+\to\rho(770)^0K^*(892)^+$ decays are measured. [...]
arXiv:2508.13563; LHCb-PAPER-2025-026; CERN-EP-2025-171; LHCB-PAPER-2025-026.- Geneva : CERN, 2026-01-14 - 27 p. - Published in : Phys. Rev. Lett. 136 (2026) 021803 Fulltext: LHCb_PAPER_2025_026_arXiv - PDF; 2508.13563 - PDF; document - PDF; Related data file(s): ZIP; Supplementary materials: ZIP;

Detaljerad journal
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. The analysis is performed using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9 ${\rm fb}^{-1}$. [...]
arXiv:2508.00492; LHCb-PAPER-2024-034; CERN-EP-2024-320.- Geneva : CERN, 2025-11-01 - 38 p. - Published in : Phys. Rev. D 112 (2025) 092003 Fulltext: LHCb-PAPER-2024-034-figures - ZIP; 2508.00492 - PDF; LHCb-PAPER-2024-034-supplementary - ZIP; document - PDF;

Detaljerad journal
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$^{-1}$. The measured ratios of these branching fractions are \[ \frac{BF(B^{0} \rightarrow J/\psi \eta^{\prime})}{BF(B^{0} \rightarrow J/\psi \eta)} = 0.48 \pm 0.06 \pm 0.02 \pm 0.01, \] \[\frac{BF(B^{0}_{s} \rightarrow J/\psi \eta^{\prime})}{BF(B^{0}_{s} \rightarrow J/\psi \eta)} = 0.80 \pm 0.02 \pm 0.02 \pm 0.01, \] where the uncertainties are statistical, systematic and related to the precision of the $\eta^{(\prime)}$ branching fractions, respectively. [...]
arXiv:2507.13914; LHCb-PAPER-2025-025; CERN-EP-2025-148; LHCB-PAPER-2025-025.- Geneva : CERN, 2025-10-14 - 32 p. - Published in : JHEP 2510 (2025) 113 Fulltext: 2507.13914 - PDF; document - PDF; Related data file(s): ZIP;

Detaljerad journal
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${}^{-1}$. The measured value is \begin{equation*} \frac{{{\cal B}}(B^0\to\rho(770)^0\gamma)}{{{\cal B}}(B^0\to K^{*}(892)^0\gamma)}=0.0189\pm 0.0007\pm 0.0005, \end{equation*} where the first uncertainty is statistical and the second systematic. [...]
arXiv:2507.14401; LHCb-PAPER-2025-017; CERN-EP-2025-144; LHCB-PAPER-2025-017.- Geneva : CERN, 2025-12-19 - 21 p. - Published in : JHEP 2512 (2025) 151 Fulltext: LHCb_PAPER_2025_017_arXiv - PDF; supplementary_material - ZIP; 2507.14401v3 - PDF; 2507.14401 - PDF; document - PDF; Related data file(s): ZIP;

Detaljerad journal
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, $r_{\tau}\equiv\tau_{{\it{\Xi}}_b^0}/\tau_{{\it{\Lambda}}_b^0}$. The value ${r_{\tau}^{\rm Run\,2}=1.004\pm0.009\pm0.006}$ is obtained, where the first uncertainty is statistical and the second systematic. [...]
arXiv:2507.12402; LHCb-PAPER-2025-023; CERN-EP-2025-139.- Geneva : CERN, 2025-09-01 - 25 p. - Published in : Phys. Rev. D 112 (2025) 052012 Fulltext: LHCb-PAPER-2025-023-figures - ZIP; LHCb-PAPER-2025-023-supplementary - ZIP; 2507.12402 - PDF; publication - PDF;

Detaljerad journal
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 $6\,\text{fb}^{-1}$. The ratio of branching fraction to that of $\mathit{\Lambda}_b^{0} \!\rightarrow\mathit{\Lambda}_{c}^{+}D_{s}^{-}$ decays is measured as $0.0141 \pm 0.0019 \pm 0.0012$, where the first uncertainty is statistical and the second systematic. [...]
arXiv:2507.10713; LHCb-PAPER-2025-022; CERN-EP-2025-138; LHCB-PAPER-2025-022.- Geneva : CERN, 2025-09-01 - 24 p. - Published in : Phys. Rev. D 112 (2025) 052013 Fulltext: LHCb-PAPER-2025-022-figures - ZIP; 2507.10713 - PDF; publication - PDF;

Detaljerad journal