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: IFTRun2Paper - PDF; 2508.20180 - PDF; document - PDF; Related data file(s): ZIP;
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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 $9\,\mathrm{fb}^{-1}$. 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: 2508.17836v1 - PDF; 2508.17836 - PDF; document - PDF; Related data file(s): ZIP; External link: Fulltext
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2025-08-04
15:07 |
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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$^{-1}$. 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: LHCb-PAPER-2025-025 - PDF; 2507.13914 - PDF; document - PDF; Related data file(s): ZIP;
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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, $r_{\tau}\equiv\tau_{{\it{\Xi}}_b^0}/\tau_{{\it{\Lambda}}_b^0}$. 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-FINAL - PDF; LHCb-PAPER-2025-023-figures - ZIP; LHCb-PAPER-2025-023-supplementary - ZIP; 2507.12402 - PDF; publication - PDF;
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2025-07-15
10:24 |
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2025-06-27
17:01 |
Updated measurement of $CP$ violation and polarisation in $B^0_s \rightarrow J/\psi \overline{K}{}^{*}\kern-1pt(892)^{0}$ decays
/ LHCb Collaboration
A time-integrated angular analysis of the decay $B^0_s \rightarrow J/\psi \overline{K}{}^{*}\kern-1pt(892)^{0}$, with $J/\psi \rightarrow \mu^{+} \mu^{-}$ and $\overline{K}{}^{*}\kern-1pt(892)^{0} \rightarrow K^{-} \pi^{+}$, is presented. The analysis employs a sample of proton-proton collision data collected by the LHCb experiment during 2015-2018 at a centre-of-mass energy of $13 \text{TeV}$, corresponding to an integrated luminosity of $6 \text{fb}^{-1}$. [...]
arXiv:2506.22090; LHCb-PAPER-2025-020; CERN-EP-2025-131; LHCB-PAPER-2025-020.-
Geneva : CERN, 2025-10-21 - 35 p.
- Published in : 10.1007/JHEP10(2025)173
Fulltext: 2506.22090 - PDF; document - PDF; Related data file(s): ZIP;
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2025-06-16
15:07 |
Measurement of the $\Omega_c^0$ and $\Xi_c^0$ baryon lifetimes using hadronic $b$-baryon decays
/ LHCb Collaboration
The lifetimes of the $\Omega_c^0$ and $\Xi_c^0$ baryons are measured using a $pp$ collision dataset collected by the LHCb experiment, corresponding to an integrated luminosity of $9~\rm{fb^{-1}}$. The charm baryons are produced in the fully reconstructed decay chains $\Omega_b^- \rightarrow \Omega_c^0 (\rightarrow pK^-K^-\pi^+)~\pi^-$ and $\Xi_b^- \rightarrow \Xi_c^0 (\rightarrow pK^-K^-\pi^+)~\pi^-$. [...]
arXiv:2506.13334; LHCb-PAPER-2025-013,CERN-EP-2025-117; LHCb-PAPER-2025-013; CERN-EP-2025-117; LHCB-PAPER-2025-013.-
Geneva : CERN, 2025-09-18 - 25 p.
- Published in : JHEP 2509 (2025) 157
Fulltext: LHCb-PAPER-2025-013 - PDF; pdf - PDF; LHCb-PAPER-2025-013-supplementary - ZIP; 2506.13334 - PDF; document - PDF; Related data file(s): ZIP;
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2025-06-13
09:50 |
Measurement of $\psi(2S)$ to $J/\psi$ cross-section ratio as function of multiplicity in $p$Pb collisions at $\sqrt{s_{NN}} = 8.16$ TeV
/ LHCb Collaboration
The production ratio of $\psi(2S)$ to $J/\psi$ charmonium states is presented as a function of multiplicity in proton-lead collisions at a centre-of-mass energy of $\sqrt{s_{NN}}=8.16$ TeV, for both prompt and nonprompt sources. The total luminosity recorded by the \lhcb experiment corresponds to 13.6 $\rm {nb}^{-1}$ for $p$Pb collisions and 20.8 $\rm {nb}^{-1}$ for Pb$p$ collisions, where the first particle indicates the forward direction of the detector. [...]
arXiv:2506.08624; LHCb-PAPER-2025-011; CERN-EP-2025-114; LHCB-PAPER-2025-011.-
Geneva : CERN, 2025-11-26 - 23 p.
- Published in : JHEP 2511 (2025) 169
Fulltext: LHCb-PAPER-2025-011 - PDF; 2506.08624 - PDF PDF; document - PDF; Related data file(s): ZIP;
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2025-05-22
10:01 |
Measurement of the $Z$-boson mass
/ LHCb Collaboration
The first dedicated $Z$-boson mass measurement at the LHC with $Z \to \mu^+\mu^-$ decays is reported. The dataset uses proton-proton collisions at a centre-of-mass energy of $13$ TeV, recorded in 2016 by the LHCb experiment, and corresponds to an integrated luminosity of $1.7$ fb$^{-1}$. [...]
arXiv:2505.15582; LHCb-PAPER-2025-008; CERN-EP-2025-111; LHCB-PAPER-2025-008.-
Geneva : CERN, 2025-10-17 - 22 p.
- Published in : Phys. Rev. Lett. 135 (2025) 161802
Fulltext: LHCb-PAPER-2025-008-figures - ZIP; figures_supplementary - ZIP; 2505.15582 - PDF; document - PDF;
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