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CERN Document Server Намерени са 2,051 записа  1 - 10следващкрай  отиване на запис: Търсенето отне 7.26 секунди. 
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Measurement of $\tau _\text {L}$ using the ${B} _s^0 \rightarrow J/\psi \eta $ decay mode / LHCb Collaboration
Using a proton-proton collision data sample collected by the LHCb detector and corresponding to an integrated luminosity of 5.7 $\text{fb}^{-1}$, the lifetime of the $B_{s}^{0}$ mass eigenstate, $\tau_{L}$, is measured using $B_{s}^{0} \to J/\psi \eta$ decay mode to be $\tau_{L}$ = 1.445 $\pm$ 0.016(stat) $\pm$ 0.008(syst) ps. A combination of this result with a previous LHCb analysis using an independent dataset corresponding to 3 $\text{fb}^{-1}$ of integrated luminosity gives $\tau_{L}$ = 1.452 $\pm$ 0.014 $\pm$ 0.007 $\pm$ 0.002 ps, where the first uncertainty is statistical, the second due to the uncorrelated part of the systematic uncertainty and the third due to the correlated part of the systematic uncertainty..
arXiv:2206.03088; LHCb-PAPER-2022-010 CERN-EP-2022-099; CERN-EP-2022-099; LHCb-PAPER-2022-010.- 2023-07-17 - 14 p. - Published in : Eur. Phys. J. C 83 (2023) 629 Fulltext: 2206.03088 - PDF; document - PDF;
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Observation of $\Xi_b^0 \rightarrow \Xi_c^+ D_s^-$ and $\Xi_b^- \rightarrow \Xi_c^0 D_s^-$ decaysObservation of $\Xi_b^0 \rightarrow \Xi_c^+ D_s^-$ and $\Xi_b^- \rightarrow \Xi_c^0 D_s^-$ decays / LHCb Collaboration
The $\Xi_b^0 \rightarrow \Xi_c^+ D_s^-$ and $\Xi_b^- \rightarrow \Xi_c^0 D_s^-$ decays are observed for the first time using proton-proton collision data collected by the LHCb experiment at a centre-of-mass energy of $\sqrt{s}=13\mathrm{TeV}$, corresponding to an integrated luminosity of $5.1\mathrm{fb}^{-1}$. The relative branching fractions times the beauty-baryon production cross-sections are measured to be $\begin{align*} \mathcal{R}\left(\frac{\Xi_b^0}{\Lambda_b^0}\right) &\equiv \frac{\sigma\left(\Xi_b^0\right)}{\sigma\left(\Lambda_b^0\right)} \times \frac{\mathcal{B}\left(\Xi_b^0 \rightarrow \Xi_c^+ D_s^-\right)}{\mathcal{B}\left(\Lambda_b^0 \rightarrow \Lambda_c^0 D_s^-\right)} =(15.8\pm1.1\pm0.6\pm7.7)\%,\\ \mathcal{R}\left(\frac{\Xi_b^-}{\Lambda_b^0}\right) &\equiv \frac{\sigma\left(\Xi_b^-\right)}{\sigma\left(\Lambda_b^0\right)} \times \frac{\mathcal{B}\left(\Xi_b^- \rightarrow \Xi_c^0 D_s^-\right)}{\mathcal{B}\left(\Lambda_b^0 \rightarrow \Lambda_c^0 D_s^-\right)} =(16.9\pm1.3\pm0.9\pm4.3)\%, \end{align*}$ where the first uncertainties are statistical, the second systematic, and the third due to the uncertainties on the branching fractions of relevant charm-baryon decays. [...]
arXiv:2310.13546; CERN-EP-2023-173; LHCb-PAPER-2023-017.- Geneva : CERN, 2024-03-07 - 17 p. - Published in : Eur. Phys. J. C 84 (2024) 237 Fulltext: LHCb-PAPER-2023-017 - PDF; 2310.13546 - PDF; Publication - PDF; Related data file(s): ZIP;
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3.
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Search for ${{B} _{c} ^+} \!\rightarrow {{\pi } ^+} {\mu ^+\mu ^-} $ decays and measurement of the branching fraction ratio ${\mathcal {B}} ({{B} _{c} ^+} \!\rightarrow {\psi {(2S)}} {{\pi } ^+} )/{\mathcal {B}} ({{B} _{c} ^+} \!\rightarrow {{J \hspace{-1.66656pt}/\hspace{-1.111pt}\psi }} {{\pi } ^+} )$ / LHCb Collaboration
The first search for nonresonant $B_c^+\to\pi^+\mu^+\mu^-$ decays is reported. The analysis uses proton-proton collision data collected with the LHCb detector between 2011 and 2018, corresponding to an integrated luminosity of 9 fb$^{-1}$. [...]
arXiv:2312.12228; LHCb-PAPER-2023-037; CERN-EP-2023-280; LHCB-PAPER-2023-037.- Geneva : CERN, 2024-05-07 - 27 p. - Published in : Eur. Phys. J. C 84 (2024) 468 Fulltext: LHCb-Paper-2023-037 - PDF; 2312.12228 - PDF; document - PDF; Related data file(s): ZIP;
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Observation of $\Lambda_b^0 \to \Lambda_c^+ \bar{D}^{(*)0} K^-$ and $\Lambda_b^0 \to \Lambda_c^+ D_s^{*-}$ decays / LHCb Collaboration
The decays $\Lambda_b^0 \to \Lambda_c^+\bar{D}^{(*)0}K^-$ and $\Lambda_b^0 \to \Lambda_c^+ D_s^{*-}$ are observed for the first time, in proton-proton collision data at $\sqrt{s}=13$TeV corresponding to an integrated luminosity of 5.4 fb${}^{-1}$ collected with the LHCb detector. Their ratios of branching fractions with respect to the $\Lambda_b^0\!\to\Lambda_c^+\mathrm{D}_s^-$ mode are measured to be \begin{align*} \begin{split} \frac{\mathcal{B}(\Lambda_b^0 \to \Lambda_c^+\bar{D}^0 K^-)}{\mathcal{B}(\Lambda_b^0 \to \Lambda_c^+ D_s^-)} & = 0.1908 {}_{-0.0034}^{+0.0036} {}_{-0.0018}^{+0.0016} \pm 0.0038 \\ \frac{\mathcal{B}(\Lambda_b^0 \to \Lambda_c^+\bar{D}^{*0} K^-)}{\mathcal{B}(\Lambda_b^0 \to \Lambda_c^+ D_s^-)} & = 0.589 {}_{-0.017}^{+0.018} {}_{-0.018}^{+0.017} \pm 0.012 \\ \frac{\mathcal{B}(\Lambda_b^0 \to \Lambda_c^+ D_s^{*-})}{\mathcal{B}(\Lambda_b^0 \to \Lambda_c^+ D_s^-)} & = 1.668 \pm 0.022 {}_{-0.055}^{+0.061}\ , \end{split} \end{align*} where the first uncertainties are statistical, the second systematic, and the third, for the $\Lambda_b^0 \to \Lambda_c^+ \bar{D}^{(*)0} K^-$ decays, are due to the uncertainties on the branching fractions of the $D_s^- \to K^- K^+ \pi^-$ and $\bar{D}^0 \to K^+\pi^-$ decay modes. [...]
arXiv:2311.14088; CERN-EP-2023-244; LHCb-PAPER-2023-034.- Geneva : CERN, 2024-06-05 - 24 p. - Published in : Eur. Phys. J. C 84 (2024) 575 Fulltext: 2311.14088 - PDF; document - PDF; LHCb_PAPER_2023_034 - PDF; Related data file(s): ZIP; Supplementary information: ZIP;
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Study of charmonium production via the decay to $p\bar{p}$ at $\sqrt{s} = 13\,\rm{TeV}$ / LHCb Collaboration
Charmonium production cross-section in proton-proton collisions is measured at the centre-of-mass energy $\sqrt{s}=13\,\rm{TeV}$ using decays to $p\bar{p}$ final state. The study is performed using a data sample corresponding to an integrated luminosity of $2.2\,\rm{fb}^{-1}$ collected in 2018 with the $\mbox{LHCb}$ detector. [...]
arXiv:2407.14261; LHCb-PAPER-2024-004; CERN-EP-2024-165; LHCB-PAPER-2024-004.- Geneva : CERN, 2024-12-09 - 19 p. - Published in : Eur. Phys. J. C 84 (2024) 1274 Fulltext: LHCb_PAPER_2024-004 - PDF; 2407.14261 - PDF; document - PDF; Related data file(s): ZIP;
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Tracking of charged particles with nanosecond lifetimes at LHCb / LHCb Collaboration
A method is presented to reconstruct charged particles with lifetimes between 10 ps and 10 ns, which considers a combination of their decay products and the partial tracks created by the initial charged particle. Using the $\Xi^-$ baryon as a benchmark, the method is demonstrated with simulated events and proton-proton collision data at $\sqrt{s}=13$ TeV, corresponding to an integrated luminosity of 2.0 fb${}^{-1}$ collected with the LHCb detector in 2018. [...]
arXiv:2403.09483; CERN-EP-2024-077; LHCb-DP-2023-004.- 2024-07-30 - 23 p. - Published in : Eur. Phys. J. C 84 (2024) 761 Figures: ZIP; Fulltext: 2403.09483 - PDF; document - PDF;
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Search for $D^{*}(2007)^0\to\mu^+\mu^-$ in $B^-\to\pi^-\mu^+\mu^-$ decays / LHCb Collaboration
The very rare $D^{*}(2007)^0\to\mu^+\mu^-$ decay is searched for by analysing $B^-\to\pi^-\mu^+\mu^-$ decays. The analysis uses a sample of beauty mesons produced in proton-proton collisions collected with the LHCb detector between 2011 and 2018, corresponding to an integrated luminosity of 9 fb$^{-1}$. [...]
arXiv:2304.01981; LHCb-PAPER-2023-004; CERN-EP-2023-050.- Geneva : CERN, 2023-07-26 - 23 p. - Published in : Eur. Phys. J. C 83 (2023) 666 Fulltext: document - PDF; 2304.01981 - PDF; Related data file(s): ZIP;
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A study of $C\!P$ violation in the decays $B^\pm\to[K^+K^-\pi^+\pi^-]_D h^{\pm}$ ($h = K, \pi$) and $B^\pm\to[\pi^+\pi^-\pi^+\pi^-]_D h^{\pm}$ / LHCb Collaboration
The first study of $C\!P$ violation in the decay mode $B^\pm\to[K^+K^-\pi^+\pi^-]_D h^{\pm}$, with $h=K,\pi$, is presented, exploiting a data sample of proton-proton collisions collected by the LHCb experiment that corresponds to an integrated luminosity of $9$ fb$^{-1}$. The analysis is performed in bins of phase space, which are optimised for sensitivity to local $C\!P$ asymmetries. [...]
arXiv:2301.10328; LHCb-PAPER-2022-037; CERN-EP-2022-285.- Geneva : CERN, 2023-06-29 - 28 p. - Published in : Eur. Phys. J. C
Fulltext: 2301.10328 - PDF; Publication - PDF; Related data file(s): ZIP; Supplementary information: ZIP;
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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;
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${{J}/\psi }$ 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;
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