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CERN Document Server 找到 78 筆記錄  1 - 10下一個最後  跳到記錄: 檢索需時 0.74 秒. 
1.
Measurement of the ratio of branching fractions of the decays $\Lambda_b^0 \!\to \psi(2S) \Lambda$ and $\Lambda_b^0 \!\to J\!/\!\psi \Lambda$ / LHCb Collaboration
Using $pp$ collisions corresponding to 3$\,\text{fb}^{-1}$ integrated luminosity, recorded by the LHCb experiment at centre-of-mass energies of 7 and 8$\,\text{TeV}$, the ratio of branching fractions \begin{align*} \mathcal{B}(\Lambda^0_b\!\to\psi(2S) \Lambda )/\mathcal{B}(\Lambda^0_b\!\to J/\psi \Lambda)= 0.513 \pm 0.023\, (\text{stat}) \pm 0.016 \, (\text{syst}) \pm 0.011\, (\mathcal{B}) \end{align*} is determined. The first uncertainty is statistical, the second is systematic and the third is due to the external branching fractions used..
arXiv:1902.02092; LHCb-PAPER-2017-041; CERN-EP-2019-003.- Geneva : CERN, 2019-03-22 - 16 p. - Published in : JHEP 03 (2019) 126 Article from SCOAP3: PDF; Fulltext: LHCb-Paper-2017-041 - PDF; 1902.02092 - PDF; Related data file(s): ZIP;
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2.
First Measurement of Charm Production in its Fixed-Target Configuration at the LHC / LHCb Collaboration
The first measurement of heavy-flavour production by the LHCb experiment in its fixed-target mode is presented. The production of $J/\psi$ and $D^0$ mesons is studied with beams of protons of different energies colliding with gaseous targets of helium and argon with nucleon-nucleon centre-of-mass energies of $\sqrt{s_{NN}} = 86.6 $ and $ 110.4$ ${\rm GeV}$, respectively. [...]
arXiv:1810.07907; LHCb-PAPER-2018-023; CERN-EP-2018-266.- Geneva : CERN, 2019-04-03 - 12 p. - Published in : Phys. Rev. Lett. Article from SCOAP3: PDF; Fulltext: PDF; Fulltext from Publisher: PDF; Related data file(s): ZIP; Supplementary information: ZIP;
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3.
Observation of two resonances in the $\Lambda_b^0 \pi^\pm$ systems and precise measurement of $\Sigma_b^\pm$ and $\Sigma_b^{*\pm}$ properties / LHCb Collaboration
The first observation of two structures consistent with resonances in the final states $\Lambda_b^0 \pi^-$ and $\Lambda_b^0 \pi^+$ is reported using samples of $pp$ collision data collected by the LHCb experiment at $\sqrt{s} = 7$ and $8$ TeV, corresponding to an integrated luminosity of 3 $\mathrm{fb}^{-1}$. The ground states $\Sigma_b^\pm$ and $\Sigma_b^{*\pm}$ are also confirmed and their masses and widths are precisely measured..
arXiv:1809.07752; LHCb-PAPER-2018-032; CERN-EP-2018-243; LHCB-PAPER-2018-032.- Geneva : CERN, 2019-01-12 - 9 p. - Published in : Phys. Rev. Lett. 122 (2019) 012001 Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Figures, tables and other information
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4.
Prompt $\Lambda^+_c$ production in $p\mathrm{Pb}$ collisions at $\sqrt{s_{NN}} = 5.02$ TeV / LHCb Collaboration
The production of $\Lambda^+_c$ baryons produced directly at the interacting point is studied in proton-lead collisions collected with the LHCb detector at the LHC. The data sample corresponds to an integrated luminosity of $1.58\mathrm{nb}^{-1}$ recorded at a nucleon-nucleon centre-of-mass energy of $\sqrt{s_{NN}}=5.02$ TeV. [...]
arXiv:1809.01404; LHCb-PAPER-2018-021; CERN-EP-2018-193.- 2019-02-15 - 26 p. - Published in : JHEP 02 (2019) 102 Article from SCOAP3: PDF; Figures: ZIP; Fulltext: PDF; External link: Figures, tables and other information
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5.
Physics case for an LHCb Upgrade II - Opportunities in flavour physics, and beyond, in the HL-LHC era / LHCb Collaboration
The LHCb Upgrade II will fully exploit the flavour-physics opportunities of the HL-LHC, and study additional physics topics that take advantage of the forward acceptance of the LHCb spectrometer. [...]
arXiv:1808.08865 ; LHCB-PUB-2018-009 ; CERN-LHCC-2018-027 ; LHCC-G-171. - 2016. - 178 p.
Full text - Full text
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6.
Search for lepton-flavour-violating decays of Higgs-like bosons / LHCb Collaboration
A search is presented for a Higgs-like boson with mass in the range 45 to 195 GeV/$c^2$ decaying into a muon and a tau lepton. The dataset consists of proton-proton interactions at a centre-of-mass energy of 8 TeV, collected by the LHCb experiment, corresponding to an integrated luminosity of 2 fb$^{-1}$. [...]
arXiv:1808.07135; CERN-EP-2018-210; LHCb-PAPER-2018-030.- Geneva : CERN, 2018-12-12 - 20 p. - Published in : 10.1140/epjc/s10052-018-6386-8 Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Figures, tables and other information
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7.
Measurement of antiproton production in ${\rm p He}$ collisions at $\sqrt{s_{NN}}=110$ GeV / LHCb Collaboration
The cross-section for prompt antiproton production in collisions of protons with an energy of $6.5$ TeV incident on helium nuclei at rest is measured with the LHCb experiment from a data set corresponding to an integrated luminosity of $0.5 ~~\rm nb^{-1}$. The target is provided by injecting helium gas into the LHC beam line at the LHCb interaction point. [...]
arXiv:1808.06127; LHCb-PAPER-2018-031; CERN-EP-2018-217.- Geneva : CERN, 2018-11-30 - 10 p. - Published in : Phys. Rev. Lett. 121 (2018) 222001 Article from SCOAP3: PDF; Fulltext: PDF; Fulltext from Publisher: PDF; Related data file(s): ZIP; Supplementary information: ZIP; External link: Figures, tables and other information
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8.
Angular moments of the decay $\Lambda_b^0 \rightarrow \Lambda \mu^{+} \mu^{-}$ at low hadronic recoil / LHCb Collaboration
An analysis of the angular distribution of the decay $\Lambda_b^0 \rightarrow \Lambda \mu^{+} \mu^{-}$ is presented, using data collected with the LHCb detector between 2011 and 2016 and corresponding to an integrated luminosity of approximately $5\,fb^{-1}$. Angular observables are determined using a moment analysis of the angular distribution at low hadronic recoil, corresponding to the dimuon invariant mass squared range $15 < q^{2} < 20\, GeV^2/c^4$. [...]
arXiv:1808.00264; CERN-EP-2018-197; LHCb-PAPER-2018-029.- Geneva : CERN, 2018-09-26 - 27 p. - Published in : JHEP 09 (2018) 146 Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP; Supplementary information: ZIP; External link: Figures, tables and other information
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9.
Measurement of the relative $B^{-} \rightarrow D^{0} / D^{*0} / D^{**0} \mu^{-} \overline{\nu}_\mu$ branching fractions using $B^{-}$ mesons from $\overline{B}{}_{s2}^{*0}$ decays / LHCb Collaboration
The decay of the narrow resonance $\overline{B}{}_{s2}^{*0}\!\rightarrow B^- K^+$ can be used to determine the $B^-$ momentum in partially reconstructed decays without any assumptions on the decay products of the $B^-$ meson. This technique is employed for the first time to distinguish contributions from $D^0$, $D^{*0}$, and higher-mass charmed states ($D^{**0}$) in semileptonic $B^-$ decays by using the missing-mass distribution. [...]
arXiv:1807.10722; LHCb-PAPER-2018-024; CERN-EP-2018-190.- Geneva : CERN, 2019-05-31 - 16 p. - Published in : Phys. Rev. D 99 (2019) 092009 Article from SCOAP3: PDF; Fulltext: PDF; Fulltext from Publisher: PDF; Related data file(s): ZIP; Supplementary information: ZIP; External link: Figures, tables and other information
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10.
Search for $C\!P$ violation in $\Lambda^0_b \to p K^-$ and $\Lambda^0_b \to p \pi^-$ decays / LHCb Collaboration
A search for $C\!P$ violation in $\Lambda^0_b \to p K^-$ and $\Lambda^0_b \to p \pi^-$ decays is presented using a sample of $pp$ collisions collected with the LHCb detector and corresponding to an integrated luminosity of 3.0 fb$^{-1}$. The $C\!P$-violating asymmetries are measured to be $A_{\mathrm{CP}}^{pK^-} = -0.020 \pm 0.013\pm 0.019$ and $A_{\mathrm{CP}}^{p\pi^-} = -0.035 \pm 0.017 \pm 0.020 $, and their difference $A_{\mathrm{CP}}^{pK^-}-A_{\mathrm{CP}}^{p\pi^-} = 0.014 \pm 0.022 \pm 0.010$, where the first uncertainties are statistical and the second systematic. [...]
arXiv:1807.06544; LHCb-PAPER-2018-025; CERN-EP-2018-189.- Geneva : CERN, 2018-12-10 - 10 p. - Published in : Phys. Lett. B 787 (2018) 124-133 Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP; Supplementary Information: ZIP; External link: Figures, tables and other information
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