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CERN Document Server 2,020 records found  1 - 10nextend  jump to record: Search took 9.35 seconds. 
1.
(100)
Probing the nature of the $\chi_{c1}(3872)$ state using radiative decays / LHCb Collaboration
The radiative decays $\chi_{c1}(3872)\rightarrow \psi(2S)\gamma$ and $\chi_{c1}(3872)\rightarrow J/\psi\gamma$ are used to probe the nature of the $\chi_{c1}(3872)$ state using proton-proton collision data collected with the LHCb detector, corresponding to an integrated luminosity of 9fb$^{-1}$. Using the $B^+ \rightarrow \chi_{c1}(3872)K^+$ decay, the $\chi_{c1}(3872)\rightarrow \psi(2S)\gamma$ process is observed for the~first time and the ratio of its partial width to that of the $\chi_{c1}(3872)\rightarrow J/\psi\gamma$ decay is measured to be $$ \frac{\Gamma_{\chi_{c1}(3872)\rightarrow \psi(2S)\gamma}} {\Gamma_{\chi_{c1}(3872)\rightarrow J\psi\gamma}} = 1.67 \pm 0.21 \pm 0.12 \pm0.04, $$ where the first uncertainty is statistical, the second systematic and the third is due to the uncertainties on the branching fractions of the $\psi(2S)$ and $J/\psi$ mesons. [...]
arXiv:2406.17006; LHCb-PAPER-2024-015; CERN-EP-2025-157; LHCB-PAPER-2024-015.- Geneva : CERN, 2024-11-21 - 33 p. - Published in : JHEP 2411 (2024) 121 Fulltext: 2406.17006 - PDF; document - PDF; Related data file(s): ZIP; Supplementary information: ZIP;
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2.
(88)
Long-lived particle reconstruction downstream of the LHCb magnet / LHCb Collaboration
Charged-particle trajectories are usually reconstructed with the LHCb detector using combined information from the tracking devices placed upstream and downstream of the 4 T m dipole magnet. [...]
arXiv:2211.10920 ; LHCb-DP-2022-001 ; CERN-LHCb-DP-2022-001. - 45.
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3.
(88)
Amplitude analysis of $B^+\to \psi(2S) K^+ \pi^+\pi^-$ decays / Aaij, Roel (Nikhef, Amsterdam) ; Abdelmotteleb, Ahmed Sameh Wagih (Warwick U.) ; Abellan Beteta, Carlos (Zurich U.) ; Abudinén, Fernando Jesus (Warwick U.) ; Ackernley, Thomas (Liverpool U.) ; Adefisoye, Ayomide Matthew (Syracuse U.) ; Adeva, Bernardo (U. Santiago de Compostela (main)) ; Adinolfi, Marco (Bristol U.) ; Adlarson, Patrik Harri ; Agapopoulou, Christina (IJCLab, Orsay) et al.
The first full amplitude analysis of $B^+ \to \psi(2S) K^+ \pi^+ \pi^-$ decays is performed using proton-proton collision data corresponding to an integrated luminosity of $9\,\text{fb}^{-1}$ recorded with the LHCb detector. [...]
arXiv:2407.12475 ; LHCb-PAPER-2024-014 ; CERN-EP-2024-177 ; LHCB-PAPER-2024-014. - 2024 - 69.
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4.
(87)
Improved measurement of $CP$ violation parameters in $B_s^0\to J/\psi K^+K^-$ decays in the vicinity of the $\phi(1020)$ resonance / LHCb Collaboration
The decay-time-dependent $CP$ asymmetry in $B_s^0\to J/\psi(\to \mu^+\mu^-) K^+ K^-$ decays is measured using proton-proton collision data, corresponding to an integrated luminosity of $6 {\rm fb}^{-1}$, collected with the LHCb detector at a center-of-mass energy of 13 TeV. Using a sample of approximately 349 000 $B_s^0$ signal decays with an invariant $K^+ K^-$ mass in the vicinity of the $\phi(1020)$ resonance, the $CP$-violating phase $\phi_s$ is measured, along with the difference in decay widths of the light and heavy mass eigenstates of the $B_s^0$-$\overline{B}_s^0$ system, $\Delta\Gamma_s$, and the difference of the average $B_s^0$ and $B^0$ meson decay widths, $\Gamma_s-\Gamma_d$. [...]
arXiv:2308.01468; LHCb-PAPER-2023-016; CERN-EP-2023-145; CERN-EP-2023-145 CERN-EP-2023-145; LHCb-PAPER-2023-016.- Geneva : CERN, 2024-02-02 - 12 p. - Published in : Phys. Rev. Lett. 132 (2024) 051802 Fulltext: 2308.01468 - PDF; LHCb-PAPER-2023-016 - PDF; Publication - PDF; Related data file(s): ZIP; Supplementary information: ZIP;
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5.
(86)
Measurement of $D^0 -\overline{D}^0$ mixing parameters and search for $CP$ violation using $D^0\rightarrow K^+\pi^-$ decays / LHCb Collaboration
A measurement of the time-dependent ratio of the $D^0\rightarrow K^+\pi^-$ to $\overline{D}^0\rightarrow K^+\pi^-$ decay rates is reported. [...]
arXiv:2407.18001 ; LHCb-PAPER-2024-008 ; CERN-EP-2024-178 ; LHCB-PAPER-2024-008. - 2024 - 43.
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6.
(86)
Measurement of the branching fraction ratios $R(D^+)$ and $R(D^{*+})$ using muonic $\tau$ decays / LHCb Collaboration
The branching fraction ratios of $\kern 0.18em \overline{\kern -0.18em B}{}^0\to D^+\tau^-\overline{\nu}_{\tau}$ and $\kern 0.18em \overline{\kern -0.18em B}{}^0\to D^{*+}\tau^-\overline{\nu}_{\tau}$ decays are measured with respect to their muonic counterparts, using a data sample corresponding to an integrated luminosity of 2.0 fb$^{-1}$ collected by the LHCb experiment in proton-proton collisions at $\sqrt{s} = 13\,\text{TeV}$. [...]
arXiv:2406.03387 ; LHCb-PAPER-2024-007 ; CERN-EP-2024-125 ; LHCB-PAPER-2024-007. - 2024 - 22.
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7.
(86)
Observation of exotic ${J\mskip -3mu/\mskip -2mu\psi}\phi$ resonances in diffractive processes in proton-proton collisions / LHCb Collaboration
The first study of $J\mskip -3mu/\mskip -2mu\psi\phi$ production in diffractive processes in proton-proton collisions is presented. [...]
arXiv:2407.14301 ; LHCb-PAPER-2023-043 ; CERN-EP-2024-149 ; LHCB-PAPER-2023-043. - 2024 - 21.
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8.
(85)
Measurement of prompt $D^+$ and $D^+_{s}$ production in $p\mathrm{Pb}$ collisions at $\sqrt {s_{\mathrm{NN}}}=5.02\,$TeV / LHCb Collaboration
The production of prompt $D^+$ and $D^+_{s}$ mesons is studied in proton-lead collisions at a centre-of-mass energy of $\sqrt {s_{\mathrm{NN}}}=5.02\,$TeV. The data sample corresponding to an integrated luminosity of $(1.58\pm0.02)\mathrm{nb}^{-1}$ is collected by the LHCb experiment at the LHC. [...]
arXiv:2309.14206; CERN-EP-2023-142; LHCb-PAPER-2023-006.- 2024-01-15 - 45 p. - Published in : JHEP 2401 (2024) 070 Fulltext: document - PDF; 2309.14206 - PDF;
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9.
(85)
Precision Measurement of <math display="inline"><mrow><mi>C</mi><mi>P</mi></mrow></math> Violation in the Penguin-Mediated Decay <math display="inline"><mrow><msubsup><mrow><mi>B</mi></mrow><mrow><mi>s</mi></mrow><mrow><mn>0</mn></mrow></msubsup><mo stretchy="false">→</mo><mi>ϕ</mi><mi>ϕ</mi></mrow></math> / LHCb Collaboration
A flavor-tagged time-dependent angular analysis of the decay $B_s^{0} \rightarrow \phi\phi$ is performed using $pp$ collision data collected by the LHCb experiment at the center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 6fb$^{-1}$. The CP-violating phase and direct CP-violation parameter are measured to be $\phi_s^{s\bar{s}s} = -0.042 \pm 0.075 \pm 0.009 $ rad and $|\lambda|=1.004\pm 0.030 \pm 0.009 $, respectively, assuming the same values for all polarization states of the $\phi\phi$ system. [...]
arXiv:2304.06198; LHCb-PAPER-2023-001; CERN-EP-2023-042.- Geneva : CERN, 2023-10-23 - 12 p. - Published in : Phys. Rev. Lett. 131 (2023) 171802 Fulltext: LHCb-PAPER-2023-001 - PDF; Publication - PDF; 2304.06198 - PDF; Related data file(s): ZIP;
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10.
(84)
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;
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