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CERN Document Server Sök i 155 journaler efter:  1 - 10nästaslut  gå till journal: Sökningen tog 0.86 sekunder. 
1.
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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2.
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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3.
Search for $CP$ violation in $\Xi_c^+\rightarrow pK^-\pi^+$ decays using model-independent techniques / LHCb Collaboration
A first search for $CP$ violation in the Cabibbo-suppressed $\Xi_c^+\rightarrow pK^-\pi^+$ decay is performed using both a binned and an unbinned model-independent technique in the Dalitz plot. The studies are based on a sample of proton-proton collision data, corresponding to an integrated luminosity of $3.0~\rm fb^{-1}$, and collected by the LHCb experiment at centre-of-mass energies of $7$ and $8~\rm TeV$. [...]
arXiv:2006.03145; CERN-EP-2020-069; LHCb-PAPER-2019-026; LHCB-PAPER-2019-026.- Geneva : CERN, 2020-10-26 - 16 p. - Published in : Eur. Phys. J. C 80 (2020) 986 Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP;
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4.
Study of the $\psi_2(3823)$ and $\chi_{c1}(3872)$ states in $B^+\to (J/\psi \pi^+\pi^-)K^+$ decays / LHCb Collaboration
The decays $B^+\rightarrow J/\psi \pi^+ \pi^- K^+$ are studied using a data set corresponding to an integrated luminosity of 9 fb$^{-1}$ collected with the LHCb detector in proton-proton collisions between 2011 and 2018. Precise measurements of the ratios of branching fractions with the intermediate $\psi_2(3823)$, $\chi_{c1}(3872)$ and $\psi(2S)$ states are reported. [...]
arXiv:2005.13422; CERN-EP-2020-071; LHCb-PAPER-2020-009; LHCB-PAPER-2020-009.- Geneva : CERN, 2020-08-25 - 29 p. - Published in : JHEP 2008 (2020) 123 Article from SCOAP3: PDF; Fulltext: LHCb-PAPER-2020-009 - PDF; 2005.13422 - PDF; Related data files: ZIP; Supplementary information: ZIP; External link: Interactions.org article
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5.
Measurement of the branching fractions for $B^+\to D^{*+}D^-K^+$, $B^+\to D^{*-}D^+K^+$, and $B^0\to D^{*-}D^0K^+$ decays / LHCb Collaboration
A measurement of four branching-fraction ratios for three-body decays of $B$ mesons involving two open-charm hadrons in the final state is presented. Run 1 and Run 2 $pp$ collision data are used, recorded by the LHCb experiment at centre-of-mass energies $7$, $8$, and $13$ TeV and corresponding to an integrated luminosity of $9.1$ fb$^{-1}$. [...]
arXiv:2005.10264; LHCb-PAPER-2020-006; CERN-EP-2020-056; LHCB-PAPER-2020-006.- Geneva : CERN, 2020-12-21 - 22 p. - Published in : JHEP 2012 (2020) 139 Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP; Supplementary information: ZIP;
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6.
Measurement of the $\Lambda^0_b\rightarrow J/\psi\Lambda$ angular distribution and the $\Lambda^0_b$ polarisation in $pp$ collisions / LHCb Collaboration
This paper presents an analysis of the $\Lambda^0_b\rightarrow J/\psi\Lambda$ angular distribution and the transverse production polarisation of $\Lambda^0_b$ baryons in proton-proton collisions at centre-of-mass energies of 7, 8 and 13 TeV. The measurements are performed using data corresponding to an integrated luminosity of 4.9 fb$^{-1}$, collected with the LHCb experiment. [...]
arXiv:2004.10563; LHCb-PAPER-2020-005; CERN-EP-2020-051; LHCB-PAPER-2020-005.- Geneva : CERN, 2020-06-17 - 30 p. - Published in : JHEP 2006 (2020) 110 Article from SCOAP3: PDF; Fulltext: PDF; Fulltext from publisher: PDF; Related data file(s): ZIP; Supplementary information: ZIP;
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7.
Precision measurement of the $B_{c}^{+}$ meson mass / LHCb Collaboration
A precision measurement of the $B_{c}^{+}$ meson mass is performed using proton-proton collision data collected with the LHCb experiment at centre-of-mass energies of $7, 8$ and $13$ TeV, corresponding to a total integrated luminosity of $9.0$ fb$^{-1}$. The $B_{c}^{+}$ mesons are reconstructed via the decays $B_{c}^{+} \rightarrow J\mskip -3mu/\mskip -2mu\psi\mskip 2mu \pi^+$, $B_{c}^{+} \rightarrow J\mskip -3mu/\mskip -2mu\psi\mskip 2mu \pi^+ \pi^- \pi^+$, $B_{c}^{+} \rightarrow J\mskip -3mu/\mskip -2mu\psi\mskip 2mu p \bar{p} \pi^+$, $B_{c}^{+} \rightarrow J\mskip -3mu/\mskip -2mu\psi\mskip 2mu D_{s}^{+}$, $B_{c}^{+} \rightarrow J\mskip -3mu/\mskip -2mu\psi\mskip 2mu D^{0} K^{+}$ and $B_{c}^{+} \rightarrow B_{s}^{0} \pi^+$. [...]
arXiv:2004.08163; LHCb-PAPER-2020-003; CERN-EP-2020-048; LHCB-PAPER-2020-003.- Geneva : CERN, 2020-07-20 - 21 p. - Published in : JHEP 2007 (2020) 123 Article from SCOAP3: PDF; Fulltext: LHCb-PAPER-2020-003_arXiv - PDF; 2004.08163 - PDF; Related data file(s): ZIP;
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8.
Observation of new $\Xi_c^0$ baryons decaying to $\Lambda_c^+K^-$ / LHCb Collaboration
The $\Lambda_c^+K^-$ mass spectrum is studied with a data sample of $pp$ collisions at a centre-of-mass energy of 13 TeV corresponding to an integrated luminosity of 5.6 fb$^{-1}$ collected by the LHCb experiment. Three $\Xi_c^0$ states are observed with a large significance and their masses and natural widths are measured to be \begin{eqnarray*} m(\Xi_c(2923)^0)&=& 2923.04 \pm 0.25 \pm 0.20 \pm 0.14 ~\mathrm{MeV},\\ \Gamma(\Xi_c(2923)^0) &=& 7.1 \pm 0.8 \pm 1.8~\mathrm{MeV}, \end{eqnarray*} \begin{eqnarray*} m(\Xi_c(2939)^0) &=& 2938.55 \pm 0.21 \pm 0.17 \pm 0.14~\mathrm{MeV},\\ \Gamma(\Xi_c(2939)^0) &=& 10.2 \pm 0.8 \pm 1.1~\mathrm{MeV}, \end{eqnarray*} \begin{eqnarray*} m(\Xi_c(2965)^0) &=& 2964.88 \pm 0.26 \pm 0.14 \pm 0.14~\mathrm{MeV}, \\ \Gamma(\Xi_c(2965)^0) &=& 14.1 \pm 0.9 \pm 1.3~\mathrm{MeV}, \end{eqnarray*} where the uncertainties are statistical, systematic, and due to the limited knowledge of the $\Lambda_c^+$ mass. [...]
arXiv:2003.13649; LHCb-PAPER-2020-004; CERN-EP-2020-038; LHCB-PAPER-2020-004.- Geneva : CERN, 2020-06-05 - 11 p. - Published in : Phys. Rev. Lett. Article from SCOAP3: PDF; Fulltext: LHCb_PAPER_2020_004_arXiv - PDF; 2003.13649 - PDF; Fulltext from Publisher: PDF; Related data files: ZIP; Supplementary information: ZIP;
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9.
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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10.
Search for the lepton flavour violating decay $B^+ \rightarrow K^+ \mu^- \tau^+$ using $B_{s2}^{*0}$ decays / LHCb Collaboration
A search is presented for the lepton flavour violating decay $B^+ \rightarrow K^+ \mu^- \tau^+$ using a sample of proton--proton collisions at centre-of-mass energies of 7, 8, and 13 TeV, collected with the LHCb detector and corresponding to a total integrated luminosity of 9 fb${}^{-1}$. The $\tau$ leptons are selected inclusively, primarily via decays with a single charged particle. [...]
arXiv:2003.04352; LHCb-PAPER-2019-043; CERN-EP-2020-020; LHCB-PAPER-2019-043.- Geneva : CERN, 2020-06-22 - 19 p. - Published in : JHEP 2006 (2020) 129 Article from SCOAP3: PDF; Fulltext: LHCb-PAPER-2019-043 - PDF; 2003.04352 - PDF; Related data file(s): ZIP;
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