CERN Accelerating science

CERN Document Server 297 record trovati  1 - 10successivofine  salta al record: La ricerca ha impiegato 0.62 secondi. 
1.
A precise measurement of the $B^0$ meson oscillation frequency / LHCb collaboration
The oscillation frequency, $\Delta m_d$, of $B^0$ mesons is measured using semileptonic decays with a $D^-$ or $D^{*-}$ meson in the final state, in a data sample of $pp$ collisions collected by the LHCb detector corresponding to an integrated luminosity of 3.0$\mbox{fb}^{-1}$. A combination of the two decay modes gives $\Delta m_d = (505.0 \pm 2.1 \pm 1.0) \rm \,ns^{-1}$, where the first uncertainty is statistical and the second is systematic. [...]
arXiv:1604.03475; LHCB-PAPER-2015-031; CERN-EP-2016-084; LHCB-PAPER-2015-031; CERN-EP-2016-084.- Geneva : CERN, 2016-07-21 - 27 p. - Published in : Eur. Phys. J. C 76 (2016) 412 Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP; Springer Open Access article: PDF; External link: Figures, tables and other information
2.
Observation of the $B_s^0 \rightarrow J/\psi \phi \phi$ decay / LHCb collaboration
The $B_s^0 \rightarrow J/\psi \phi \phi$ decay is observed in $pp$ collision data corresponding to an integrated luminosity of 3 fb$^{-1}$ recorded by the LHCb detector at centre-of-mass energies of 7 TeV and 8 TeV. This is the first observation of this decay channel, with a statistical significance of 15 standard deviations. [...]
arXiv:1601.05284; LHCB-PAPER-2015-033; CERN-EP-2016-006; LHCB-PAPER-2015-033; CERN-EP-2016-006.- Geneva : CERN, 2016 - 20 p. - Published in : JHEP 03 (2016) 040 Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF; Related data file(s): ZIP; Springer Open Access article: PDF; External link: Figures, tables and other information
3.
Measurements of long-range near-side angular correlations in $\sqrt{s_{\text{NN}}}=5$TeV proton-lead collisions in the forward region / LHCb collaboration
Two-particle angular correlations are studied in proton-lead collisions at a nucleon-nucleon centre-of-mass energy of $\sqrt{s_{\text{NN}}}=5$TeV, collected with the LHCb detector at the LHC. The analysis is based on data recorded in two beam configurations, in which either the direction of the proton or that of the lead ion is analysed. [...]
arXiv:1512.00439; LHCB-PAPER-2015-040; CERN-PH-EP-2015-308; LHCB-PAPER-2015-040; CERN-PH-EP-2015-308.- Geneva : CERN, 2016-11-10 - 11 p. - Published in : Phys. Lett. B 762 (2016) 473-483 Article from SCOAP3: PDF; Elsevier Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Figures, tables and other information
4.
First observation of the decay $D^{0}\rightarrow K^{-}\pi^{+}\mu^{+}\mu^{-}$ in the $\rho^{0}$-$\omega$ region of the dimuon mass spectrum / LHCb collaboration
A study of the decay $D^{0}\rightarrow K^{-}\pi^{+}\mu^{+}\mu^{-}$ is performed using data collected by the LHCb detector in proton-proton collisions at a centre-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 2.0 fb$^{-1}$. Decay candidates with muon pairs that have an invariant mass in the range 675--875 MeV$/c^2$ are considered. [...]
arXiv:1510.08367; LHCB-PAPER-2015-043; CERN-PH-EP-2015-283.- Geneva : CERN, 2016-06-10 - 10 p. - Published in : Phys. Lett. B 757 (2016) 558 Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Figures, tables and other information
5.
Search for the rare decays $B^{0}\to J/\psi \gamma$ and $B^{0}_{s} \to J/\psi \gamma$ / LHCb collaboration
A search for the rare decay of a $B^{0}$ or $B^{0}_{s}$ meson into the final state $J/\psi\gamma$ is performed, using data collected by the LHCb experiment in $pp$ collisions at $\sqrt{s}=7$ and $8$ TeV, corresponding to an integrated luminosity of 3 fb$^{-1}$. The observed number of signal candidates is consistent with a background-only hypothesis. [...]
arXiv:1510.04866; LHCB-PAPER-2015-044; CERN-PH-EP-2015-276; LHCB-PAPER-2015-044; CERN-PH-EP-2015-276.- Geneva : CERN, 2015-12-07 - 9 p. - Published in : Phys. Rev. D 92 (2015) 112002 APS Open Access article: PDF; Fulltext: arXiv:1510.04866 - PDF; 10.1103_PhysRevD.92.112002 - PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; External link: Figures, tables and other information
6.
Model-independent confirmation of the $Z(4430)^-$ state / LHCb collaboration
The decay $B^0\to \psi(2S) K^+\pi^-$ is analyzed using $\rm 3~fb^{-1}$ of $pp$ collision data collected with the LHCb detector. A model-independent description of the $\psi(2S) \pi$ mass spectrum is obtained, using as input the $K\pi$ mass spectrum and angular distribution derived directly from data, without requiring a theoretical description of resonance shapes or their interference. [...]
arXiv:1510.01951; CERN-PH-EP-2015-244; LHCB-PAPER-2015-038; CERN-PH-EP-2015-244; LHCB-PAPER-2015-038.- 2015-12-29 - 15 p. - Published in : Phys. Rev. D 92 (2015) 112009 APS Open Access article: PDF; Fulltext: 10.1103_PhysRevD.92.112009 - PDF; arXiv:1510.01951 - PDF; External link: Figures, tables and other information
7.
Model-independent measurement of mixing parameters in $D^0 \to K_S^0 \pi^+ \pi^-$ decays / LHCb collaboration
The first model-independent measurement of the charm mixing parameters in the decay $D^0 \to K_S \pi^+ \pi^-$ is reported, using a sample of $pp$ collision data recorded by the LHCb experiment, corresponding to an integrated luminosity of 1.0 fb$^{-1}$ at a centre-of-mass energy of 7 TeV. The measured values are \begin{eqnarray*} x &=& ( -0.86 \pm 0.53 \pm 0.17 ) \times 10^{-2}, \\ y &=& ( +0.03 \pm 0.46 \pm 0.13 ) \times 10^{-2}, \end{eqnarray*} where the first uncertainties are statistical and include small contributions due to the external input for the strong phase measured by the CLEO collaboration, and the second uncertainties are systematic..
arXiv:1510.01664; CERN-PH-EP-2015-249; LHCB-PAPER-2015-042; CERN-PH-EP-2015-249; LHCB-PAPER-2015-042.- Geneva : CERN, 2016-04-06 - 25 p. - Published in : JHEP 04 (2016) 033 Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; Springer Open Access article: PDF; External link: Figures, tables and other information
8.
Measurements of prompt charm production cross-sections in $pp$ collisions at $\sqrt{s}$ = 13 TeV / LHCb Collaboration
Production cross-sections of prompt charm mesons are measured with the first data from $pp$ collisions at the LHC at a centre-of-mass energy of $13\,\mathrm{TeV}$. The data sample corresponds to an integrated luminosity of $4.98 \pm 0.19\,\mathrm{pb}^{-1}$ collected by the LHCb experiment. [...]
arXiv:1510.01707; LHCB-PAPER-2015-041; CERN-PH-EP-2015-272.- Geneva : CERN, 2016-03-22 - 46 p.

Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Erratum: PDF; Fulltext: arXiv:1510.01707 - PDF; LHCb-PAPER-2015-041 - PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; External link: Figures, tables and other information
9.
Measurement of the forward-backward asymmetry in $Z/\gamma^{\ast} \rightarrow \mu^{+}\mu^{-}$ decays and determination of the effective weak mixing angle / LHCb Collaboration
The forward-backward charge asymmetry for the process $q\bar{q} \rightarrow Z/\gamma^{\ast} \rightarrow \mu^{+}\mu^{-}$ is measured as a function of the invariant mass of the dimuon system. Measurements are performed using proton proton collision data collected with the LHCb detector at $\sqrt {s} = 7$ and 8 TeV, corresponding to integrated luminosities of 1 fb$^{-1}$ and 2 fb$^{-1}$ respectively. [...]
arXiv:1509.07645; LHCB-PAPER-2015-039; CERN-PH-EP-2015-250; LHCB-PAPER-2015-039; CERN-PH-EP-2015-250.- Geneva : CERN, 2015-11-27 - 20 p. - Published in : JHEP 11 (2015) 190 Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; Springer Open Access article: PDF; External link: Figures, tables and other information
10.
Studies of the resonance structure in $D^0\to K^0_S K^{\pm}\pi^{\mp}$ decays / LHCb Collaboration
Amplitude models are applied to studies of resonance structure in $D^0\to K^0_S K^- \pi^+$ and $D^0\to K^0_S K^+ \pi^-$ decays using $pp$ collision data corresponding to an integrated luminosity of $3.0\,\mathrm{fb}^{-1}$ collected by the LHCb experiment. Relative magnitude and phase information is determined, and coherence factors and related observables are computed for both the whole phase space and a restricted region of $100\,\mathrm{MeV/}c^2$ around the $K^{*}(892)^{\pm}$ resonance. [...]
arXiv:1509.06628; CERN-PH-EP-2015-238; LHCB-PAPER-2015-026; LHCB-PAPER-2015-026; CERN-PH-EP-2015-238.- Geneva : CERN, 2016-03-31 - 35 p. - Published in : Phys. Rev. D 93 (2016) 052018 APS Open Access article: PDF; Fulltext: arXiv:1509.06628 - PDF; 10.1103_PhysRevD.93.052018 - PDF; Related data file(s): ZIP; Related supplementary data file(s) 1: ZIP; Related supplementary data file(s) 2: ZIP; External link: Preprint

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