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CERN Document Server 找到 2,034 笔记录  1 - 10下一个最後  跳到记录: 检索需时 5.13 秒. 
1.
(100)
Test of lepton universality with $\Lambda^{0}_{b} \to p K^- \ell^+ \ell^-$ decays / LHCb Collaboration
The ratio of branching fractions of the decays $\Lambda^{0}_{b}\to pK^{-}e^{+}e^{-}$ and $\Lambda^{0}_{b}\to pK^{-}\mu^{+}\mu^{-}$, $R^{-1}_{pK}$, is measured for the first time using proton-proton collision data corresponding to an integrated luminosity of 4.7 fb$^{-1}$ recorded with the LHCb experiment at center-of-mass energies of 7, 8 and 13 TeV. In the dilepton mass-squared range $0.1 < q^{2} < 6.0$ $GeV^{2}/c^{4}$ and the $pK^{-}$ mass range $m(pK^{-}) < 2600$ $MeV/c^{2}$, the ratio of branching fractions is measured to be $R^{-1}_{pK} = 1.17 ^{+0.18}_{-0.16} \pm 0.07$, where the first uncertainty is statistical and the second systematic. [...]
arXiv:1912.08139; LHCb-PAPER-2019-040; CERN-EP-2019-272; LHCB-PAPER-2019-040.- Geneva : CERN, 2020-05-11 - 26 p. - Published in : JHEP 2020 (2020) 040 Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP; Supplementary information: ZIP;
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2.
(91)
Search for the doubly heavy $\mathit{\Xi}_{bc}^{0}$ baryon via decays to $D^0pK^-$ / LHCb Collaboration
A search for the doubly heavy $\mathit{\Xi}_{bc}^{0}$ baryon using its decay to the $D^0pK^-$ final state is performed using proton-proton collision data at a centre-of-mass energy of 13 TeV collected by the LHCb experiment between 2016 and 2018, corresponding to an integrated luminosity of 5.4 $\mathrm{fb}^{-1}$. No significant signal is found in the invariant mass range from 6.7 to 7.2 $\mathrm{GeV}/c^2$. [...]
arXiv:2009.02481; LHCb-PAPER-2020-014; CERN-EP-2020-137; LHCB-PAPER-2020-014.- Geneva : CERN, 2020 - 21 p. - Published in : JHEP 2011 (2020) 095 Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP;
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3.
(91)
Observation of enhanced double parton scattering in proton-lead collisions at $\sqrt{s_\mathrm{NN}}=8.16$ TeV / LHCb Collaboration
A study of prompt charm-hadron pair production in proton-lead collisions at $\sqrt{s_\mathrm{NN}}= 8.16$ TeV is performed using data corresponding to an integrated luminosity of about 30 nb${}^{-1}$, collected with the LHCb experiment. Production cross-sections for different pairs of charm hadrons are measured and kinematic correlations between the two charm hadrons are investigated. [...]
arXiv:2007.06945; LHCb-PAPER-2020-010; CERN-EP-2020-119; LHCB-PAPER-2020-010.- Geneva : CERN, 2020-11-20 - 13 p. - Published in : Phys. Rev. Lett. 125 (2020) 212001 Article from SCOAP3: PDF; Fulltext: 2007.06945 - PDF; Paper-2020-010 - PDF; Related data file(s): ZIP; Supplementary information: ZIP;
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4.
(91)
First observation of the decay $\Lambda_b^0 \to \eta_c(1S) p K^-$ / LHCb Collaboration
The decay $\Lambda_b^0 \to \eta_c(1S) p K^-$ is observed for the first time using a data sample of proton-proton collisions, corresponding to an integrated luminosity of 5.5 $fb^{-1}$, collected with the LHCb experiment at a centre-of-mass energy of 13 TeV. The branching fraction of the decay is measured, using the $\Lambda_b^0 \to J/\psi p K^-$ decay as a normalisation mode, to be $\mathcal{B}(\Lambda_b^0 \to \eta_c(1S) p K^-)=(1.06\pm0.16\pm0.06^{+0.22}_{-0.19})\times10^{-4}$, where the quoted uncertainties are statistical, systematic and due to external inputs, respectively. [...]
arXiv:2007.11292; LHCb-PAPER-2020-012; CERN-EP-2020-124; LHCB-PAPER-2020-012.- Geneva : CERN, 2020-12-23 - 12 p. - Published in : Phys. Rev. D 102 (2020) 112012 Article from SCOAP3: PDF; Fulltext: PDF; Fulltext from Publisher: PDF; Related data file(s): ZIP; Supplementary information: ZIP;
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5.
(91)
Measurement of the shape of the $ {B}_s^0\to {D}_s^{\ast -}{\mu}^{+}{\nu}_{\mu } $ differential decay rate / LHCb Collaboration
The shape of the $B_s^0\rightarrow D_s^{*-}\mu^+\nu_{\mu}$ differential decay rate is obtained as a function of the hadron recoil using proton-proton collision data at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 1.7 fb$^{-1}$ collected by the LHCb detector. The $B_s^0\rightarrow D_s^{*-}\mu^+\nu_{\mu}$ decay is reconstructed through the decays $D_s^{*-}\rightarrow D_s^{-}\gamma$ and $D_s^{-}\rightarrow K^-K^+\pi^-$. [...]
arXiv:2003.08453; LHCb-PAPER-2019-046; CERN-EP-2020-026; LHCB-PAPER-2019-046.- Geneva : CERN, 2020-12-22 - 32 p. - Published in : JHEP 2012 (2020) 144 Article from SCOAP3: PDF; Fulltext: 2003.08453 - PDF; LHCb-PAPER-2019-046 - PDF; Related data files: ZIP; Supplementary material: ZIP;
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6.
(91)
Search for heavy neutral leptons in $W^+ \to \mu^+ \mu^{\pm} jet $ decays / LHCb Collaboration
A search is performed for heavy neutrinos in the decay of a $W$ boson into two muons and a jet. The data set corresponds to an integrated luminosity of approximately $3.0 \text{ fb}^{- 1}$ of proton-proton collision data at centre-of-mass energies of 7 and $8 \text{ TeV}$ collected with the LHCb experiment. [...]
arXiv:2011.05263; LHCb-PAPER-2020-022; CERN-EP-2020-194; LHCB-PAPER-2020-022.- Geneva : CERN, 2021-03-22 - 15 p. - Published in : Eur. Phys. J. C 81 (2021) 248 Article from SCOAP3: PDF; Fulltext: 2011.05263 - PDF; LHCb-PAPER-2020-022 - PDF; Related data file(s): ZIP; Supplementary information: ZIP;
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7.
(91)
Observation of the $\varLambda^{0}_{b}\to\varLambda^{+}_{c}K^{+}K^{-}\pi^{-}$ decay / LHCb Collaboration
The $\varLambda^{0}_{b}\to\varLambda^{+}_{c}K^{+}K^{-}\pi^{-}$ decay is observed for the first time using a data sample of proton-proton collisions at centre-of-mass energies of $\sqrt{s}=7$ and 8 $\rm{TeV}$ collected by the $\mbox{LHCb}$ detector, corresponding to an integrated luminosity of $3{\rm{fb}^{-1}}$. The ratio of branching fractions between the $\varLambda^{0}_{b}\to\varLambda^{+}_{c}K^{+}K^{-}\pi^{-}$ and the $\varLambda^{0}_{b}\to\varLambda^{+}_{c}D^{-}_{s}$ decays is measured to be \begin{equation*} \frac{\mathcal{B} ( \varLambda^{0}_{b}\to\varLambda^{+}_{c}K^{+}K^{-}\pi^{-}) } {\mathcal{B} ( \varLambda^{0}_{b}\to\varLambda^{+}_{c} D^{-}_{s})} = (9.26 \pm 0.29 \pm 0.46 \pm 0.26)\times10^{-2}, \end{equation*} where the first uncertainty is statistical, the second systematic and the third is due to the knowledge of the $D^{-}_{s}\to K^{+}K^{-}\pi^{-}$ branching fraction. [...]
arXiv:2011.13738; LHCb-PAPER-2020-028; CERN-EP-2020-209; LHCB-PAPER-2020-028; LHCB-PAPER-2020-028.- Geneva : CERN, 2021-04-10 - 20 p. - Published in : Phys. Lett. B 815 (2021) 136172 Article from SCOAP3: PDF; Fulltext: PAPER-LHCb-2020-028-arXiv - PDF; 2011.13738 - PDF; Related data file(s): ZIP;
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8.
(91)
Search for long-lived particles decaying to $e^{\pm} \mu^{\mp} \nu$ / LHCb Collaboration
Long-lived particles decaying to $e^\pm \mu^\mp \nu$, with masses between 7 and 50 GeV/c$^2$ and lifetimes between 2 and 50 ps, are searched for by looking at displaced vertices containing electrons and muons of opposite charges. The search is performed using 5.4 fb$^{-1}$ of $pp$ collisions collected with the LHCb detector at a centre-of-mass energy of $\sqrt{s} = 13$ TeV. [...]
arXiv:2012.02696; LHCb-PAPER-2020-027; CERN-EP-2020-212.- Geneva : CERN, 2021-03-26 - 16 p. - Published in : Eur. Phys. J. C 81 (2021) 261 Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP; Supplementary information: ZIP;
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9.
(91)
Observation of structure in the $J/\psi$-pair mass spectrum / LHCb Collaboration
Using proton-proton collision data at centre-of-mass energies of $\sqrt{s} = 7$, $8$ and $13\mathrm{\,TeV}$ recorded by the LHCb experiment at the Large Hadron Collider, corresponding to an integrated luminosity of $9\mathrm{\,fb}^{-1}$, the invariant mass spectrum of $J/\psi$ pairs is studied. A narrow structure around $6.9\mathrm{\,GeV/}c^2$ matching the lineshape of a resonance and a broad structure just above twice the $J/\psi$ mass are observed. [...]
arXiv:2006.16957; CERN-EP-2020-115; LHCb-PAPER-2020-011; LHCB-PAPER-2020-011.- Geneva : CERN, 2020-12-15 - 11 p. - Published in : Sci. Bull. 65 (2020) 1983-1993 Fulltext: PDF; Related data file(s): ZIP; External link: Press Release
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10.
(91)
First observation of the decay $B_s^0 \to K^-\mu^+\nu_\mu$ and measurement of $|V_{ub}|/|V_{cb}|$ / LHCb Collaboration
The first observation of the suppressed semileptonic $B_s^0 \to K^-\mu^+\nu_\mu$ decay is reported. Using a data sample recorded in $pp$ collisions in 2012 with the LHCb detector, corresponding to an integrated luminosity of 2 $\mathrm{fb}^{-1}$, the branching fraction $\mathcal{B}(B_s^0 \to K^-\mu^+\nu_\mu)$} is measured to be $(1.06\pm0.05~(\mathrm{stat})\pm0.08~(\mathrm{syst}))\times 10^{-4}$, where the first uncertainty is statistical and the second one represents the combined systematic uncertainties. [...]
arXiv:2012.05143; LHCb-PAPER-2020-038; CERN-EP-2020-224; CERN-EP-2020-224; LHCB-PAPER-2020-038.- Geneva : CERN, 2021-02-25 - 11 p. - Published in : Phys. Rev. Lett. 126 (2021) 081804 Article from SCOAP3: PDF; Fulltext: LHCb-PAPER-2020-038 - PDF; 2012.05143 - PDF; Related data file(s): ZIP; Supplementary information: ZIP;
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