CERN Accelerating science

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1.
Search for rare decays of $D^0$ mesons into two muons / LHCb Collaboration
A search for the very rare $D^0 \to \mu^+\mu^-$ decay is performed using data collected by the LHCb experiment in proton-proton collisions at $\sqrt{s} = 7$, 8 and $13~\rm{TeV}$, corresponding to an integrated luminosity of $9~\rm{fb^{-1}}$. The search is optimised for $D^0$ mesons from $D^{\ast+}\to D^0\pi^+$ decays but is also sensitive to $D^0$ mesons from other sources. [...]
arXiv:2212.11203; LHCb-PAPER-2022-029; CERN-EP-2022-273.- 2023-07-26 - 13 p. - Published in : Phys. Rev. Lett. 131 (2023) 041804 Fulltext: PDF;
2.
Amplitude analysis of $B^0 \rightarrow \overline{D}^0 D_s^+ \pi^-$ and $B^+ \rightarrow D^- D_s^+ \pi^+$ decays / LHCb Collaboration
Resonant contributions in $B^0 \rightarrow \overline{D}{}^0 D^+_s\pi^-$ and $B^+\rightarrow D^- D^+_s\pi^+$ decays are determined with an amplitude analysis, which is performed both separately and simultaneously, where in the latter case isospin symmetry between the decays is assumed. The analysis is based on data collected by the LHCb detector in proton-proton collisions at center-of-mass energies of 7, 8 and 13 TeV. [...]
arXiv:2212.02717; LHCb-PAPER-2022-027; CERN-EP-2022-246.- Geneva : CERN, 2023-07-01 - 30 p. - Published in : Phys. Rev. D 108 (2023) 012017 Fulltext: 2212.02717 - PDF; LHCb-PAPER-2022-027 - PDF; Publication - PDF; Related data file(s): ZIP;
3.
First observation of a doubly charged tetraquark and its neutral partner / LHCb Collaboration
A combined amplitude analysis is performed for the decays $B^0 \rightarrow \overline{D}{}^0 D^+_s\pi^-$ and $B^+\rightarrow D^- D^+_s\pi^+$, which are related by isospin symmetry. The analysis is based on data collected by the LHCb detector in proton-proton collisions at center-of-mass energies of 7, 8 and 13 TeV. [...]
arXiv:2212.02716; LHCb-PAPER-2022-026; CERN-EP-2022-239.- Geneva : CERN, 2023-07-27 - 12 p. - Published in : Phys. Rev. Lett. 131 (2023) 041902 Fulltext: Publication - PDF; LHCb-PAPER-2022-026 - PDF; 2212.02716 - PDF; Related data file(s): ZIP; Supplementary information: ZIP;
4.
Charmonium production in $p$Ne collisions at $\sqrt{s_{\rm NN}}=68.5$ GeV / LHCb Collaboration
The measurement of charmonium states produced in proton-neon ($p$Ne) collisions by the LHCb experiment in its fixed-target configuration is presented. The production of $J/\psi$ and $\psi(2S)$ mesons is studied with a beam of 2.5 TeV protons colliding on gaseous neon targets at rest, corresponding to a nucleon-nucleon centre-of-mass energy $\sqrt{s_{\rm NN}}=68.5$ GeV. [...]
arXiv:2211.11645; CERN-EP-2022-216; LHCb-PAPER-2022-014.- Geneva : CERN, 2023-07-17 - 11 p. - Published in : Eur. Phys. J. C 83 (2023) 625 Fulltext: Publication - PDF; 2211.11645 - PDF; Related data file(s): ZIP;
5.
${{J}/\psi }$ and ${{D}} ^0$ production in $\sqrt{s_{\scriptscriptstyle \text {NN}}} =68.5\,\text {GeV} $ PbNe collisions / LHCb Collaboration
The first measurement of $J/\psi$ and $D^0$ production in PbNe collisions by the LHCb experiment in its fixed-target configuration is reported. The production of $J/\psi$ and $D^0$ mesons is studied with a beam of lead ions with an energy of 2.5 TeV per nucleon colliding on gaseous neon targets at rest, corresponding to a nucleon-nucleon centre-of-mass energy of $\sqrt{s_{\rm NN}}$ = 68.5 GeV. [...]
arXiv:2211.11652; CERN-EP-2022-215; LHCb-PAPER-2022-011.- Geneva : CERN, 2023-07-25 - 9 p. - Published in : Eur. Phys. J. C 83 (2023) 658 Fulltext: 2211.11652 - PDF; document - PDF; Related data file(s): ZIP;
6.
First observation of the $B^+ \rightarrow D_s^+ D_s^- K^+$ decay / LHCb Collaboration
The $B^+ \rightarrow D_s^+ D_s^- K^+$ decay is observed for the first time using proton-proton collision data collected by the LHCb detector at centre-of-mass energies of $7$, $8$ and $13\, \text{TeV}$, corresponding to an integrated luminosity of $9\,\text{fb}^{-1}$. Its branching fraction relative to that of the $B^{+} \rightarrow D^{+} D^{-} K^{+}$ decay is measured to be $$\frac{\mathcal{B}\left(B^{+} \rightarrow D_s^{+} D_s^{-} K^{+}\right)}{\mathcal{B}\left(B^{+} \rightarrow D^{+} D^{-} K^{+}\right)}=0.525 \pm 0.033 \pm 0.027 \pm 0.034,$$ where the first uncertainty is statistical, the second systematic, and the third is due to the uncertainties on the branching fractions of the $D_s^{\pm} \rightarrow K^{\mp} K^{\pm} \pi^{\pm}$ and $D^{\pm} \rightarrow K^{\mp} \pi^{\pm} \pi^{\pm}$ decays. [...]
arXiv:2211.05034; LHCb-PAPER-2022-019; CERN-EP-2022-205.- Geneva : CERN, 2023-08-01 - 14 p. - Published in : Phys. Rev. Lett. 108 (2023) 034012 Fulltext: 2211.05034 - PDF; Publication - PDF; Related data file(s): ZIP;
7.
Study of the $B^{-} \to \Lambda_{c}^{+} \bar{\Lambda}_{c}^{-} K^{-}$ decay / LHCb Collaboration
The decay $B^{-} \to \Lambda_{c}^{+} \bar{\Lambda}_{c}^{-} K^{-}$ is studied in proton-proton collisions at a center-of-mass energy of $\sqrt{s}=13$ TeV using data corresponding to an integrated luminosity of 5 $\mathrm{fb}^{-1}$ collected by the LHCb experiment. In the $\Lambda_{c}^+ K^{-}$ system, the $\Xi_{c}(2930)^{0}$ state observed at the BaBar and Belle experiments is resolved into two narrower states, $\Xi_{c}(2923)^{0}$ and $\Xi_{c}(2939)^{0}$, whose masses and widths are measured to be $$ m(\Xi_{c}(2923)^{0}) = 2924.5 \pm 0.4 \pm 1.1 \,\mathrm{MeV}, \\ m(\Xi_{c}(2939)^{0}) = 2938.5 \pm 0.9 \pm 2.3 \,\mathrm{MeV}, \\ \Gamma(\Xi_{c}(2923)^{0}) = \phantom{000}4.8 \pm 0.9 \pm 1.5 \,\mathrm{MeV},\\ \Gamma(\Xi_{c}(2939)^{0}) = \phantom{00}11.0 \pm 1.9 \pm 7.5 \,\mathrm{MeV}, $$ where the first uncertainties are statistical and the second systematic. [...]
arXiv:2211.00812; CERN-EP-2022-196; LHCb-PAPER-2022-028.- Geneva : CERN, 2023-07-27 - 15 p. - Published in : Phys. Rev. D 108 (2023) 012020 Fulltext: Publication - PDF; LHCb_PAPER_2022_028 - PDF; 2211.00812 - PDF; Related data file(s): ZIP;
8.
Observation of the $B_s^{0} \rightarrow D^{*+}D^{*-}$ decay / LHCb Collaboration
The first observation of the $B_s^0 \to D^{\ast +} D^{\ast -}$ decay and the measurement of its branching ratio relative to the $B_d^0 \to D^{\ast +} D^{\ast -}$ decay are presented. The data sample used corresponds to an integrated luminosity of 9 $\text{fb}^{-1}$ of proton-proton collisions recorded by the LHCb experiment at centre-of-mass energies of 7, 8 and 13 TeV between 2011 and 2018. [...]
arXiv:2210.14945; LHCb-PAPER-2022-023; CERN-EP-2022-193; LHCB-PAPER-2022-023.- Geneva : CERN, 2023-07-13 - 12 p. - Published in : JHEP 2307 (2023) 119 Fulltext: LHCB-PAPER-2022-023 - PDF; document - PDF; 2210.14945 - PDF; Related data file(s): ZIP; Supplementary information: ZIP;
9.
Observation of a resonant structure near the $D_s^+ D_s^-$ threshold in the $B^+\to D_s^+ D_s^- K^+$ decay / LHCb Collaboration
An amplitude analysis of the $B^+\to D_s^+ D_s^- K^+$ decay is carried out to study for the first time its intermediate resonant contributions, using proton-proton collision data collected with the LHCb detector at centre-of-mass energies of 7, 8 and 13 TeV. A near-threshold peaking structure, referred to as $X(3960)$, is observed in the $D_s^+ D_s^-$ invariant-mass spectrum with significance greater than 12 standard deviations. [...]
arXiv:2210.15153; CERN-EP-2022-200; LHCb-PAPER-2022-018.- Geneva : CERN, 2023-08-14 - 12 p. - Published in : Phys. Rev. Lett. 131 (2023) 071901 Fulltext: LHCb-PAPER-2022-018 - PDF; 2210.15153 - PDF; Publication - PDF; Related data file(s): ZIP;
10.
Search for the baryon- and lepton-number violating decays $B^0\to p\mu^-$ and $B^0_s\to p\mu^-$ / LHCb Collaboration
A search for the baryon- and lepton-number violating decays $B^0\to p\mu^-$ and $B^0_s\to p\mu^-$ is performed at the LHCb experiment using data collected in proton-proton collisions at $\sqrt{s}$ = 7, 8 and 13 TeV, corresponding to integrated luminosities of 1, 2 and 6 fb$^{-1}$, respectively. No significant signal for $B^0\to p\mu^-$ and $B^0_s\to p\mu^-$ decays is found and the upper limits on the branching fractions are determined to be ${\cal B}(B^0\to p\mu^-)<2.6\,(3.1)\times10^{-9}$ and ${\cal B}(B^0_s\to p\mu^-)<12.1\,(14.0)\times10^{-9}$, respectively, at 90$\%$ (95$\%$) confidence level. [...]
arXiv:2210.10412; CERN-EP-2022-195; LHCb-PAPER-2022-022.- Geneva : CERN, 2023-07-01 - 15 p. - Published in : Phys. Rev. D 108 (2023) 012021 Fulltext: Publication - PDF; 2210.10412 - PDF; Related data file(s): ZIP;

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