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CERN Document Server 296 notices trouvées  1 - 10suivantfin  aller vers la notice: La recherche a duré 1.94 secondes. 
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.
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
4.
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
5.
First measurement of the differential branching fraction and $C\!P$ asymmetry of the $B^\pm\to\pi^\pm\mu^+\mu^-$ decay / LHCb collaboration
The differential branching fraction with respect to the dimuon invariant mass squared, and the $C\!P$ asymmetry of the $B^\pm\to\pi^\pm\mu^+\mu^-$ decay are measured for the first time. The CKM matrix elements $|V_{td}|$ and $|V_{ts}|$, and the ratio $|V_{td}/V_{ts}|$ are determined. [...]
arXiv:1509.00414; LHCB-PAPER-2015-035; CERN-PH-EP-2015-219; LHCB-PAPER-2015-035; CERN-PH-EP-2015-219.- Geneva : CERN, 2015-10-06 - 22 p. - Published in : JHEP 10 (2015) 034 Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF; Related data file(s): ZIP; Springer Open Access article: PDF;
6.
Measurement of ${C\!P}$ violation parameters and polarisation fractions in ${B_s^0\to J/\psi \overline{K}^{*0}}$ decays / LHCb collaboration
The first measurement of ${C\!P}$ asymmetries in the decay ${B_s^0\to J/\psi \overline{K}^{*}(892)^{0}}$ and an updated measurement of its branching fraction and polarisation fractions are presented. The results are obtained using data corresponding to an integrated luminosity of $3.0\,fb^{-1}$ of proton-proton collisions recorded with the LHCb detector at centre-of-mass energies of $7$ and $8\,\mathrm{TeV}$. [...]
arXiv:1509.00400; CERN-PH-EP-2015-224; LHCB-PAPER-2015-034; CERN-PH-EP-2015-224; LHCB-PAPER-2015-034.- Geneva : CERN, 2015-11-12 - 39 p. - Published in : JHEP 11 (2015) 082 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
7.
Study of the production of $\Lambda_b^0$ and $\overline{B}^0$ hadrons in $pp$ collisions and first measurement of the $\Lambda_b^0\rightarrow J/\psi pK^-$ branching fraction / LHCb collaboration
The product of the $\Lambda_b^0$ ($\overline{B}^0$) differential production cross-section and the branching fraction of the decay $\Lambda_b^0\rightarrow J/\psi pK^-$ ($\overline{B}^0\rightarrow J/\psi\overline{K}^*(892)^0$) is measured as a function of the beauty hadron transverse momentum, $p_{\rm T}$, and rapidity, $y$. The kinematic region of the measurements is $p_{\rm T}<20~{\rm GeV}/c$ and $2.0 < y < 4.5$. [...]
arXiv:1509.00292; CERN-PH-EP-2015-223; LHCB-PAPER-2015-032; LHCB-PAPER-2015-032; CERN-PH-EP-2015-223.- Geneva : CERN, 2016-01-27 - 16 p. - Published in : Chin. Phys. C 40 (2016) 011001 Article from SCOAP3: PDF; Fulltext: arXiv:1509.00292 - PDF; 10.1088_1674-1137_40_1_011001 - PDF; Related data file(s): ZIP; External link: Figures, tables and other information
8.
Measurement of the time-integrated $CP$ asymmetry in $D^0 \to K^0_S K^0_S$ decays / LHCb collaboration
The time-integrated $CP$ asymmetry in the decay $D^0 \to K^0_S K^0_S$ is measured using $3 fb^{-1}$ of proton-proton collision data collected by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. The flavour of the $D^0$ meson is determined by use of the decay $D^{*+} \to D^0 \pi^+$ and its charge conjugate mode. [...]
arXiv:1508.06087; LHCB-PAPER-2015-030; CERN-PH-EP-2015-215; LHCB-PAPER-2015-030-CERN-PH-EP-2015-215; CERN-PH-EP-2015-215; LHCB-PAPER-2015-030.- Geneva : CERN, 2015-10-08 - 16 p. - Published in : JHEP 10 (2015) 055 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
9.
Measurement of the $B_s^0 \to \phi \phi$ branching fraction and search for the decay $B^0 \to \phi \phi$ / LHCb collaboration
Using a dataset corresponding to an integrated luminosity of 3.0 fb$^{-1}$ collected in $pp$ collisions at centre-of-mass energies of 7 and 8 TeV, the $B_s^0 \to \phi \phi$ branching fraction is measured to be \[ \mathcal{B}(B_s^0 \to \phi \phi) = ( 1.84 \pm 0.05 (\text{stat}) \pm 0.07 (\text{syst}) \pm 0.11 (f_s/f_d) \pm 0.12 (\text{norm}) ) \times 10^{-5}, \] where $f_s/f_d$ represents the ratio of the $B_s^0$ to $B^0$ production cross-sections, and the $B^0 \to \phi K^*(892)^0$ decay mode is used for normalization. This is the most precise measurement of this branching fraction to date, representing a factor five reduction in the statistical uncertainty compared with the previous best measurement. [...]
arXiv:1508.00788; CERN-PH-EP-2015; LHCB-PAPER-2015-028; LHCB-PAPER-2015-028; CERN-PH-EP-2015-198.- Geneva : CERN, 2015-10-08 - 20 p. - Published in : JHEP 10 (2015) 053 Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF; Related data file(s): ZIP; Springer Open Access article: PDF;
10.
$B$ flavour tagging using charm decays at the LHCb experiment / LHCb collaboration
An algorithm is described for tagging the flavour content at production of neutral $B$ mesons in the LHCb experiment. The algorithm exploits the correlation of the flavour of a $B$ meson with the charge of a reconstructed secondary charm hadron from the decay of the other $b$ hadron produced in the proton-proton collision. [...]
arXiv:1507.07892; CERN-PH-EP-2015-193; LHCB-PAPER-2015-027; CERN-PH-EP-2015-193; LHCB-PAPER-2015-027.- Geneva : CERN, 2015-10-05 - 19 p. - Published in : JINST 10 (2015) P10005 Fulltext: 10.1088_1748-0221_10_10_P10005 - PDF; arXiv:1507.07892 - PDF; IOP Open Access article: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; External link: Figures, tables and other information

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