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CERN Document Server Znaleziono 153 rekordów  1 - 10następnykoniec  skocz do rekordu: Szukanie trwało 0.64 sekund. 
1.
Measurement of the CKM angle $\gamma$ using $B^0 \rightarrow D K^{*0}$ with $D \rightarrow K^0_S \pi^+ \pi^-$ decays / LHCb collaboration
A model-dependent amplitude analysis of the decay $B^0\rightarrow D(K^0_S\pi^+\pi^-) K^{*0}$ is performed using proton-proton collision data corresponding to an integrated luminosity of 3.0fb$^{-1}$, recorded at $\sqrt{s}=7$ and $8 TeV$ by the LHCb experiment. The CP violation observables $x_{\pm}$ and $y_{\pm}$, sensitive to the CKM angle $\gamma$, are measured to be \begin{eqnarray*} x_- &=& -0.15 \pm 0.14 \pm 0.03 \pm 0.01, \\y_- &=& 0.25 \pm 0.15 \pm 0.06 \pm 0.01, \\x_+ &=& 0.05 \pm 0.24 \pm 0.04 \pm 0.01, \\y_+ &=& -0.65^{+0.24}_{-0.23} \pm 0.08 \pm 0.01, \end{eqnarray*} where the first uncertainties are statistical, the second systematic and the third arise from the uncertainty on the $D\rightarrow K^0_S \pi^+\pi^-$ amplitude model. [...]
arXiv:1605.01082; CERN-EP-2016-089; LHCB-PAPER-2016-007; LHCB-PAPER-2016-007; CERN-EP-2016-089.- Geneva : CERN, 2016-08-24 - 32 p. - Published in : JHEP 08 (2016) 137 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
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2.
Model-independent evidence for $J/\psi p$ contributions to $\Lambda_b^0\to J/\psi p K^-$ decays / LHCb collaboration
The data sample of $\Lambda_b^0\to J/\psi p K^-$ decays acquired with the LHCb detector from 7 and 8~TeV $pp$ collisions, corresponding to an integrated luminosity of 3 fb$^{-1}$, is inspected for the presence of $J/\psi p$ or $J/\psi K^-$ contributions with minimal assumptions about $K^- p$ contributions. It is demonstrated at more than 9 standard deviations that $\Lambda_b^0\to J/\psi p K^-$ decays cannot be described with $K^- p$ contributions alone, and that $J/\psi p$ contributions play a dominant role in this incompatibility. [...]
arXiv:1604.05708; LHCB-PAPER-2016-009; CERN-EP-2016-086; LHCB-PAPER-2016-009; CERN-EP-2016-086.- Geneva : CERN, 2016-08-18 - 9 p. - Published in : Phys. Rev. Lett. 117 (2016) 082002 APS Open Access article: PDF; Fulltext: 10.1103_PhysRevLett.117.082002 - PDF; arXiv:1604.05708 - PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; External link: Preprint
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3.
Measurement of the properties of the $\Xi_b^{*0}$ baryon / LHCb Collaboration
We perform a search for near-threshold $\Xi_b^0$ resonances decaying to $\Xi_b^- \pi^+$ in a sample of proton-proton collision data corresponding to an integrated luminosity of 3 fb$^{-1}$ collected by the LHCb experiment. We observe one resonant state, with the following properties: \begin{eqnarray*} m(\Xi_b^{*0}) - m(\Xi_b^-) - m(\pi^+) &=& 15.727 \pm 0.068 \, (\mathrm{stat}) \pm 0.023 \, (\mathrm{syst}) \, \mathrm{MeV}/c^2, \\ \Gamma(\Xi_b^{*0}) &=& 0.90 \pm 0.16 \, (\mathrm{stat}) \pm 0.08 \, (\mathrm{syst}) \, \mathrm{MeV} [...]
arXiv:1604.03896; LHCB-PAPER-2016-010; CERN-EP-2016-082; LHCB-PAPER-2016-010; CERN-EP-2016-082.- Geneva : CERN, 2016-05-27 - 20 p. - Published in : JHEP 05 (2016) 161 Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Figures, tables and other information
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4.
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
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5.
Measurement of the mass and lifetime of the $\Omega_b^-$ baryon / LHCb collaboration
A proton-proton collision data sample, corresponding to an integrated luminosity of 3 fb$^{-1}$ collected by LHCb at $\sqrt{s}=7$ and 8 TeV, is used to reconstruct $63\pm9$ $\Omega_b^-\to\Omega_c^0\pi^-$, $\Omega_c^0\to pK^-K^-\pi^+$ decays. Using the $\Xi_b^-\to\Xi_c^0\pi^-$, $\Xi_c^0\to pK^-K^-\pi^+$ decay mode for calibration, the lifetime ratio and absolute lifetime of the $\Omega_b^-$ baryon are measured to be \begin{align*} \frac{\tau_{\Omega_b^-}}{\tau_{\Xi_b^-}} &= 1.11\pm0.16\pm0.03, \\ \tau_{\Omega_b^-} &= 1.78\pm0.26\pm0.04\pm0.05~{\rm ps}, \end{align*} where the uncertainties are statistical, systematic and from the calibration mode (for $\tau_{\Omega_b^-}$ only). [...]
arXiv:1604.01412; LHCB-PAPER-2016-008; CERN-EP-2016-081; CERN-EP-2016-081; LHCB-PAPER-2016-008.- Geneva : CERN, 2016-05-19 - 12 p. - Published in : Phys. Rev. D 93 (2016) 092007 Fulltext: arXiv:1604.01412 - PDF; PhysRevD.93 - PDF; 10.1103_PhysRevD.93.092007 - PDF; Related data file(s): ZIP; External link: Figures, tables and other information
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6.
Model-independent measurement of the CKM angle $\gamma$ using $B^0 \to D K^{\ast 0}$ decays with $D \to K_{S}^{0} \pi^{+} \pi^{-}$ and $K_{S}^{0} K^{+} K^{-}$ / LHCb Collaboration
A binned Dalitz plot analysis of the decays $B^0 \to D K^{\ast 0}$, with $D \to K_{S}^{0} \pi^{+} \pi^{-}$ and $D \to K_{S}^{0} K^{+} K^{-}$, is performed to measure the observables $x_\pm$ and $y_\pm$, which are related to the CKM angle $\gamma$ and the hadronic parameters of the decays. The $D$ decay strong phase variation over the Dalitz plot is taken from measurements performed at the CLEO-c experiment, making the analysis independent of the $D$ decay model. [...]
arXiv:1604.01525; LHCB-PAPER-2016-006; CERN-EP-2016-083; LHCB-PAPER-2016-006; CERN-EP-2016-083.- Geneva : CERN, 2016-06-21 - 34 p. - Published in : JHEP 06 (2016) 131 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
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7.
Measurement of $C\!P$ observables in $B^\pm \rightarrow D K^\pm$ and $B^\pm \rightarrow D \pi^\pm$ with two- and four-body $D$ decays / LHCb collaboration
Measurements of $C\!P$ observables in $B^\pm \rightarrow D K^\pm$ and $B^\pm \rightarrow D \pi^\pm$ decays are presented where the $D$ meson is reconstructed in the final states $K^\pm\pi^\mp$, $\pi^\pm K^\mp$, $K^+K^-$, $\pi^+\pi^-$, $K^\pm\pi^\mp \pi^+ \pi^-$, $\pi^\pm K^\mp \pi^+ \pi^-$ and $\pi^+ \pi^- \pi^+ \pi^-$. This analysis uses a sample of charged $B$ mesons from $pp$ collisions collected by the LHCb experiment in 2011 and 2012, corresponding to an integrated luminosity of 3.0 fb$^{-1}$. [...]
arXiv:1603.08993; LHCB-PAPER-2016-003; CERN-EP-2016-065; LHCB-PAPER-2016-003; CERN-EP-2016-065.- Geneva : CERN, 2016-09-10 - 15 p. - Published in : Phys. Lett. B 76 (2016) 117-131 Article from SCOAP3: PDF; Elsevier Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; External link: Figures, tables and other information
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8.
Search for $B_c^+$ decays to the $p\overline p\pi^+$ final state / LHCb collaboration
A search for the decays of the $B_c^+$ meson to $p\overline p\pi^+$ is performed for the first time using a data sample corresponding to an integrated luminosity of 3.0 $\mathrm{fb}^{-1}$ collected by the LHCb experiment in $pp$ collisions at centre-of-mass energies of $7$ and $8$ TeV. No signal is found and an upper limit, at 95$\%$ confidence level, is set, $\frac{f_c}{f_u}\times\mathcal{B}(B_c^+\to p\overline p\pi^+)<3.6\times10^{-8}$ in the kinematic region $m(p\overline p)<2.85\mathrm{\,Ge\kern -0.1em V\!/}c^2$, $p_{\rm T}(B)<20\mathrm{\,Ge\kern -0.1em V\!/}c$ and $2.0< {y}(B)<4.5$, where $\mathcal{B}$ is the branching fraction and $f_c$ ($f_u$) is the fragmentation fraction of the $b$ quark into a $B_c^+$ ($B^+$) meson..
arXiv:1603.07037; CERN-EP-2016-072; LHCB-PAPER-2016-001; LHCB-PAPER-2016-001; CERN-EP-2016-072.- Geneva : CERN, 2016-08-10 - 9 p. - Published in : Phys. Lett. B 759 (2016) 313-321 Article from SCOAP3: PDF; Elsevier Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Figures, tables and other information
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9.
Observation of $ \Lambda_b^0 \to \psi(2S)pK^-$ and $ \Lambda_b^0 \to J/\psi \pi^+ \pi^- pK^-$ decays and a measurement of the $\Lambda_b^0$ baryon mass / LHCb collaboration
The decays $ \Lambda_b^0 \to \psi(2S)pK^-$ and $ \Lambda_b^0 \to J/\psi \pi^+ \pi^- pK^-$ are observed in a data sample corresponding to an integrated luminosity of 3fb$^{-1}$, collected in proton-proton collisions at 7 and 8TeV centre-of-mass energies by the LHCb detector. The $\psi(2S)$ mesons are reconstructed through the decay modes $\psi(2S)\to\mu^+\mu^-$ and $\psi(2S)\to J/\psi\pi^+\pi^-$ [...]
arXiv:1603.06961; CERN-EP-2016-070; LHCB-PAPER-2015-060; CERN-EP-2016-070; LHCB-PAPER-2015-060.- Geneva : CERN, 2016-05-23 - 20 p. - Published in : JHEP 05 (2016) 132 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
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10.
Search for violations of Lorentz invariance and $CPT$ symmetry in $B^0_{(s)}$ mixing / LHCb collaboration
Violations of $ CPT$ symmetry and Lorentz invariance are searched for by studying interference effects in $ B^0$ mixing and in $ B^0_s$ mixing. Samples of $ B^0\to J/\psi K^0_{\mathrm{S}}$ and $ B^0_s\to J/\psi K^+ K^-$ decays are recorded by the LHCb detector in proton--proton collisions at centre-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3 fb$^{-1}$. [...]
arXiv:1603.04804; CERN-EP-2016-048; LHCB-PAPER-2016-005; CERN-EP-2016-048; LHCB-PAPER-2016-005.- Geneva : CERN, 2016-06-15 - 10 p. - Published in : Phys. Rev. Lett. 116 (2016) 241601 APS Open Access article: PDF; Fulltext: arXiv:1603.04804 - PDF; 10.1103_PhysRevLett.116.241601 - PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; External link: Figures, tables and other information
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