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EP Articles

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2024-04-05
15:16
Observation and branching fraction measurement of the decay $\Xi_b^- \to \Lambda_b^0 \pi^-$ / LHCb Collaboration
The decay $\Xi_b^-\to\Lambda_b^0\pi^-$ is observed using a proton-proton collision data sample collected at center-of-mass energy $\sqrt{s}=13$ TeV with the LHCb detector, corresponding to an integrated luminosity of 5.5 fb$^{-1}$. This process is mediated by the $s\to u\bar{u}d$ quark-level transition, where the $b$ quark in the $\Xi_b^-$ baryon is a spectator in the decay. [...]
arXiv:2307.09427; LHCb-PAPER-2023-015; CERN-EP-2023-116; LHCB-PAPER-2023-015.- Geneva : CERN, 2023-10-01 - 16 p. - Published in : Phys. Rev. D 108 (2023) 072002 Fulltext: 2307.09427 - PDF; Publication - PDF; External link: Previous draft version

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2024-02-23
10:18
Measurement of the $Z$ boson production cross-section in $pp$ collisions at $\sqrt{s} = 5.02$ TeV / LHCb Collaboration
The first measurement of the $Z$ boson production cross-section at centre-of-mass energy $\sqrt{s} = 5.02\,$TeV in the forward region is reported, using $pp$ collision data collected by the LHCb experiment in year 2017, corresponding to an integrated luminosity of $100 \pm 2\,\rm{pb^{-1}}$. The production cross-section is measured for final-state muons in the pseudorapidity range $2.0<\eta<4.5$ with transverse momentum $p_{\rm{T}}> 20\,\rm{GeV/}\it{c}$. [...]
arXiv:2308.12940; LHCb-PAPER-2023-010; CERN-EP-2023-141; LHCB-PAPER-2023-010.- Geneva : CERN, 2024-02-13 - 38 p. - Published in : JHEP 2402 (2024) 070 Fulltext: 2308.12940 - PDF; LHCb-PAPER-2023-010 - PDF; Publication - PDF; Related data file(s): ZIP;

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2024-02-02
10:39
Measurement of the CKM angle $\gamma$ using the $B^{\pm}\rightarrow D^*h^{\pm}$ channels / LHCb Collaboration
A measurement of the $CP$-violating observables from $B^{\pm}\rightarrow D^* K^{\pm}$ and $\mbox{$B^{\pm}\rightarrow D^* \pi^{\pm}$}$ decays is presented, where $D^* (D) $ is an admixture of $D^{*0}$ and $\bar{D}^{*0}$ ($D^0$ and $\bar{D}^0$) states and is reconstructed through the decay chains $ D^* \rightarrow D\pi^0/\gamma$ and $\mbox{$D \to K_S^0 \pi^+\pi^-/K_S^0 K^+K^-$}$. The measurement is performed by analysing the signal yield variation across the $D$ decay phase space and is independent of any amplitude model. [...]
arXiv:2310.04277; LHCb-PAPER-2023-012; CERN-EP-2023-170.- Geneva : CERN, 2023-12-01 - 32 p. - Published in : JHEP 2312 (2023) 13 Fulltext: 2310.04277 - PDF; document - PDF; Publication - PDF; latex_B2Dsth_JHEP - PDF; Related data file(s): ZIP;

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2023-12-15
10:04
Amplitude analysis of the $B^0 \to K^{*0}\mu^+\mu^-$ decay / LHCb Collaboration
An amplitude analysis of the $B^{0}\to K^{*0}\mu^+\mu^-$ decay is presented using a dataset corresponding to an integrated luminosity of $4.7$ fb$^{-1}$ of $pp$ collision data collected with the LHCb experiment. For the first time, the coefficients associated to short-distance physics effects, sensitive to processes beyond the Standard Model, are extracted directly from the data through a $q^2$-unbinned amplitude analysis, where $q^2$ is the $\mu^+\mu^-$ invariant mass squared. [...]
arXiv:2312.09115; LHCb-PAPER-2023-033; CERN-EP-2023-273.- Geneva : CERN, 2024-03-28 - 13 p. - Published in : Phys. Rev. Lett. 132 (2024) 131801 Fulltext: 2312.09115 - PDF; Publication - PDF; Related data file(s): ZIP;

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2023-12-15
09:55
Determination of short- and long-distance contributions in $B^0 \to K^{*0}\mu^+\mu^-$ decays / LHCb Collaboration
An amplitude analysis of the $B^0 \to K^{*0} \mu^+ \mu^-$ decay is presented. The analysis is based on data collected by the LHCb experiment from proton-proton collisions at $\sqrt{s} = 7,\,8$ and $13$ TeV, corresponding to an integrated luminosity of $4.7$ fb$^{-1}$. [...]
arXiv:2312.09102; LHCb-PAPER-2023-032; CERN-EP-2023-237.- Geneva : CERN, 2024-03-01 - 28 p. - Published in : Phys. Rev. D 109 (2024) 052009 Fulltext: 2312.09102 - PDF; Publication - PDF; Related data file(s): ZIP; Supplementary: ZIP; Supplementary Information: ZIP;

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2023-11-29
14:11
Measurement of $J/\psi$-pair production in $pp$ collisions at $\sqrt{s}=13$ TeV and study of gluon transverse-momentum dependent PDFs / LHCb Collaboration
The production cross-section of $J/\psi$ pairs in proton-proton collisions at a centre-of-mass energy of $\sqrt{s}=13$ TeV is measured using a data sample corresponding to an integrated luminosity of 4.2 fb$^{-1}$ collected by the LHCb experiment. The measurement is performed with both $J/\psi$ mesons in the transverse momentum range $0 < p_{\text{T}}<14$ GeV/$c$ and rapidity range $2.0 < y < 4.5$. [...]
arXiv:2311.14085; LHCb-PAPER-2023-022; CERN-EP-2023-242; LHCB-PAPER-2023-022.- Geneva : CERN, 2024-03-14 - 38 p. - Published in : JHEP 2403 (2024) 088 Fulltext: LHCb-PAPER-2023-022 - PDF; document - PDF; 2311.14085 - PDF; Related data file(s): ZIP;

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2023-11-17
16:37
A model-independent measurement of the CKM angle $\gamma$ in partially reconstructed $B^{\pm} \to D^{*} h^{\pm}$ decays with $D \to K_{S}^{0} h^{+}h^{-}$$(h=\pi, K)$ / LHCb Collaboration
A measurement of $C\!P$-violating observables in $B^{\pm} \to D^{*} K^{\pm}$ and $B^{\pm} \to D^{*} \pi^{\pm}$ decays is made where the photon or neutral pion from the $D^{*} \to D\gamma$ or $D^{*} \to D\pi^{0}$ decay is not reconstructed. The $D$ meson is reconstructed in the self-conjugate decay modes, $D \to K_{S}^{0} \pi^{+} \pi^{-}$ or $D \to K_{S}^{0} K^{+} K^{-}$. [...]
arXiv:2311.10434; LHCb-PAPER-2023-029; CERN-EP-2023-241.- Geneva : CERN, 2024-02-16 - 30 p. - Published in : JHEP 2402 (2024) 118 Fulltext: Publication - PDF; 2311.10434 - PDF; Related data file(s): ZIP;

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2023-11-03
15:43
Fraction of $\chi_c$ decays in prompt $J/\psi$ production measured in $pPb$ collisions at $\sqrt{s_{NN}}=8.16 \text{TeV}$ / LHCb Collaboration
The fraction of $\chi_{c1}$ and $\chi_{c2}$ decays in the prompt $J/\psi$ yield, $F_{\chi c}=\sigma_{\chi c\to J/\psi}/\sigma_{J/\psi}$, is measured by the LHCb detector in $p$Pb collisions at $\sqrt{s_{NN}}=8.16$ TeV. The study covers the forward ($1.5< y^*<4.0$) and backward ($-5.0 < y^*<-2.5$) rapidity regions, where $y^*$ is the $J/\psi$ rapidity in the nucleon-nucleon center-of-mass system. [...]
arXiv:2311.01562; LHCb-PAPER-2023-028; CERN-EP-2023-224.- Geneva : CERN, 2024-03-08 - 20 p. - Published in : Phys. Rev. Lett. 132 (2024) 102302 Fulltext: PDF; Related data file(s): ZIP; Supplementary information: ZIP;

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2023-10-31
15:28
Search for $\textit{CP}$ violation in the phase space of $D^{0} \rightarrow K_{S}^{0} K^{\pm} \pi^{\mp} $ decays with the energy test / LHCb Collaboration
A search for CP violation in $D^{0} \rightarrow K_{S}^{0} K^{+} \pi^{-} $ and $D^{0} \rightarrow K_{S}^{0} K^{-} \pi^{+} $ decays is reported. The search is performed using an unbinned model-independent method known as the energy test that probes local CP violation in the phase space of the decays. [...]
arXiv:2310.19397; LHCb-PAPER-2023-019; CERN-EP-2023-231.- Geneva : CERN, 2024-03-19 - 21 p. - Published in : JHEP 2403 (2024) 107 Cover note: ZIP; Fulltext: LHCb-PAPER-2023-019 - PDF; document - PDF; 2310.19397 - PDF;

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2023-10-26
15:02
Production of <math><mi>η</mi></math> and <math><msup><mi>η</mi><mo>′</mo></msup></math> mesons in <math><mrow><mi>p</mi><mi>p</mi></mrow></math> and <math><mrow><mi>p</mi><mi>Pb</mi></mrow></math> collisions / LHCb Collaboration
The production of $\eta$ and $\eta'$ mesons is studied in proton-proton and proton-lead collisions collected with the LHCb detector. Proton-proton collisions are studied at center-of-mass energies of $5.02$ and $13~{\rm TeV}$, and proton-lead collisions are studied at a center-of-mass energy per nucleon of $8.16~{\rm TeV}$. [...]
arXiv:2310.17326; LHCb-PAPER-2023-030; CERN-EP-2023-228.- Geneva : CERN, 2024-02-13 - 20 p. - Published in : Phys. Rev. C 109 (2024) 024907 Fulltext: 2310.17326 - PDF; Publication - PDF; Related data file(s): ZIP;

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