CERN Accelerating science

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1.
Search for prompt production of pentaquarks in charm hadron final states / LHCb Collaboration
A search for hidden-charm pentaquark states decaying to a range of $\Sigma_{c}\bar{D}$ and $\Lambda_{c}^{+}\bar{D}$ final states, as well as doubly-charmed pentaquark states to $\Sigma_{c}D$ and $\Lambda_{c}^{+}D$, is made using samples of proton-proton collision data corresponding to an integrated luminosity of $5.7fb^{-1}$ recorded by the LHCb detector at $\sqrt{s} = 13 Te\kern -0.1em V$. Since no significant signals are found, upper limits are set on the pentaquark yields relative to that of the $\Lambda_{c}^+$ baryon in the $\Lambda_{c}^{+}\to pK^{-}\pi^{+}$ decay mode. [...]
arXiv:2404.07131; LHCb-PAPER-2023-018; CERN-EP-2024-071; LHCB-PAPER-2023-018.- Geneva : CERN, 2024-08-01 - 19 p. - Published in : Phys. Rev. D 110 (2024) 032001 Fulltext: 2404.07131 - PDF; LHCb-PAPER-2023-018 - PDF; Publication - PDF; Related data file(s): ZIP; Supplementary information: PDF;
2.
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; Xib2LbPi_2023_14Aug2023 - PDF; External link: Previous draft version
3.
Modification of $\chi_{c1}$(3872) and $\psi$(2$S$) production in $p$Pb collisions at $\sqrt{s_{NN}} = 8.16$ TeV / LHCb Collaboration
The LHCb collaboration measures production of the exotic hadron $\chi_{c1}$(3872) in proton-nucleus collisions for the first time. Comparison with the charmonium state $\psi$(2$S$) suggests that the exotic $\chi_{c1}$(3872) experiences different dynamics in the nuclear medium than conventional hadrons, and comparison with data from proton-proton collisions indicates that the presence of the nucleus may modify $\chi_{c1}$(3872) production rates. [...]
arXiv:2402.14975; LHCb-PAPER-2023-026; CERN-EP-2024-033.- 2024-06-13 - 20 p. - Published in : Phys. Rev. Lett. 132 (2024) 242301 Fulltext: 2402.14975 - PDF; Publication - PDF;
4.
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;
5.
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;
6.
Prompt and nonprompt $\psi(2S)$ production in $p$Pb collisions at $\sqrt{s_{NN}}=8.16$ TeV / LHCb Collaboration
The production of $\psi(2S)$ mesons in proton-lead collisions at a centre-of-mass energy per nucleon pair of $\sqrt{s_{NN}}=8.16$ TeV is studied with the LHCb detector using data corresponding to an integrated luminosity of 34 nb$^{-1}$. The prompt and nonprompt $\psi(2S)$ production cross-sections and the ratio of the $\psi(2S)$ to $J/\psi$ cross-section are measured as a function of the meson transverse momentum and rapidity in the nucleon-nucleon centre-of-mass frame, together with forward-to-backward ratios and nuclear modification factors. [...]
arXiv:2401.11342; LHCb-PAPER-2023-024; CERN-EP-2023-293.- Geneva : CERN, 2024-04-19 - 55 p. - Published in : JHEP 2404 (2024) 111 Fulltext: 2401.11342 - PDF; document - PDF; Related data file(s): ZIP;
7.
Measurement of associated $J/\psi$-$\psi(2S)$ production cross-section in $pp$ collisions at $\sqrt{s}=13$ TeV / LHCb Collaboration
The cross-section of associated $J/\psi$-$\psi(2S)$ production 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 for both $J/\psi$ and $\psi(2S)$ mesons having transverse momentum $p_{\text{T}}< 14$ GeV/$c$ and rapidity $2.0< y< 4.5$, assuming negligible polarisation of the $J/\psi$ and $\psi(2S)$ mesons. [...]
arXiv:2311.15921; LHCb-PAPER-2023-023; CERN-EP-2023-243.- Geneva : CERN, 2024-05-23 - 27 p. - Published in : JHEP 2405 (2024) 259 Fulltext: LHCb-PAPER-2023-023 - PDF; document - PDF; Publication - PDF; 2311.15921 - PDF; Related data file(s): ZIP;
8.
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;
9.
Measurement of the $D^*$ longitudinal polarization in $B^0 \to D^{* -}\tau^+\nu_{\tau}$ decays   / LHCb Collaboration
The longitudinal polarization fraction of the $D^*$ meson is measured in $B^0 \to D^{* -}\tau^+\nu_{\tau}$ decays, where the $\tau$ lepton decays to three charged pions and a neutrino, using proton-proton collision data collected by the LHCb experiment at center-of-mass energies of 7, 8 and 13 TeV and corresponding to an integrated luminosity of 5 fb$^{-1}$. The $D^*$ polarization fraction $F_L^{D^*}$ is measured in two $q^2$ regions, below and above 7 GeV$^2$/c$^4$, where $q^2$ is defined as the squared invariant mass of the $\tau\nu_{\tau}$ system. [...]
arXiv:2311.05224; LHCb-PAPER-2023-020; CERN-EP-2023-225.- Geneva : CERN, 2024-11-01 - 18 p. - Published in : Phys. Rev. D 110 (2024) 092007 Fulltext: 2311.05224 - PDF; Publication - PDF; Related data file(s): ZIP;
10.
Observation of strangeness enhancement with charmed mesons in high-multiplicity $p\mathrm{Pb}$ collisions at $\sqrt {s_{\mathrm{NN}}}=8.16\,$TeV / LHCb Collaboration
The production of prompt$D{_s}{^+}$ and $D^+$ mesons is measured by the LHCb experiment in proton-lead ($p$Pb) collisions in both the forward (1.5 < $y{^\ast}$ < 4.0) and backward (-5.0 < $y{^\ast}$ < -2.5) rapidity regions at a nucleon-nucleon center-of-mass energy of $\sqrt{^sNN}$=8.16 $\text{TeV}$. The nuclear modification factors of both $D{_s}{^+}$ and $D^+$ mesons are determined as a function of transverse momentum, $p{_T}$, and rapidity. [...]
arXiv:2311.08490; LHCb-PAPER-2023-021; CERN-EP-2023-236.- Geneva : CERN, 2024-08-01 - 14 p. - Published in : Phys. Rev. D 110 (2024) L031105 Fulltext: 2311.08490 - PDF; Publication - PDF; LHCb_PAPER_2023_021_arXiv_ - PDF; Related data file(s): ZIP; Supplementary information: ZIP;

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