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CERN Document Server 2,050 records found  1 - 10próximoend  jump to record: Search took 4.47 seconds. 
1.
(100)
Measurement of the CKM angle $\gamma$ using $B^\pm \to D K^\pm$ with $D \to K^0_{\rm S} \pi^+\pi^-, K^0_{\rm S} K^+ K^-$ decays / LHCb Collaboration
A binned Dalitz plot analysis of $B^\pm \to D K^\pm$ decays, with $D \to K^0_{\rm S} \pi^+\pi^-$ and $D \to K^0_{\rm S} K^+ K^-$, is performed to measure the $C\!P$-violating observables $x_{\pm}$ and $y_{\pm}$, which are sensitive to the Cabibbo-Kobayashi-Maskawa angle $\gamma$. The analysis exploits a sample of proton-proton collision data corresponding to 3.0 fb$^{-1}$ collected by the LHCb experiment. [...]
arXiv:1408.2748; LHCB-PAPER-2014-041; CERN-PH-EP-2014-202; LHCB-PAPER-2014-041; CERN-PH-EP-2014-202.- Geneva : CERN, 2014-10-16 - 32 p. - Published in : JHEP 10 (2014) 097 Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP; Springer Open Access article: PDF; External link: Preprint
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2.
(87)
First observation of the decay $B_s^0 \rightarrow \phi \bar{K}^{*0}$ / LHCb collaboration
A first observation of the decay $B_s^0 \rightarrow \phi \bar{K}^{*0}$ is reported from an analysis based on a data sample, corresponding to an integrated luminosity of 1.0 fb$^{-1}$ of $pp$ collisions at $\sqrt{s} = 7 TeV$, collected with the LHCb detector. A yield of $30 \pm 6$ $B_s^0 \to (KK)(K\pi)$ candidates is found in the mass windows $1012.5 < M(KK) < 1026.5 MeV/c^2$ and $746 < M(K\pi)< 1046 MeV/c^2$, corresponding to a signal significance of 6.1 standard deviations. [...]
arXiv:1306.2239; LHCB-PAPER-2013-012; CERN-PH-EP-2013-087; LHCB-PAPER-2013-012; CERN-PH-EP-2013-087.- Geneva : CERN, 2013-11-12 - 22 p. - Published in : JHEP 11 (2013) 092 Fulltext: PDF; Related data file(s): ZIP; Springer Open Access article: PDF; External link: Preprint
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3.
(87)
Exclusive J/$\psi$ and $\psi$(2S) production in $pp$ collisions at $\sqrt{s} = 7$ TeV / LHCb Collaboration
Exclusive $J/\psi$ and $\psi(2S)$ vector meson production has been observed in the dimuon channel using the LHCb detector. The cross-section times branching fractions to two muons with pseudorapidities between 2.0 and 4.5 are measured to be \begin{equation*} \sigma_{pp\rightarrow J/\psi (\rightarrow \mu^{+} \mu^{-})} (2.0 <\eta_{\mu^{\pm}}< 4.5) = 307 \pm 21 \pm 36~\text{pb}, \end{equation*} \begin{equation*} \sigma_{pp\rightarrow \psi(2S) (\rightarrow \mu^{+} \mu^{-})} (2.0 <\eta_{\mu^{\pm}}< 4.5) = 7.8 \pm 1.3 \pm 1.0~\text{pb}, \end{equation*} where the first uncertainties are statistical and the second are systematic. [...]
arXiv:1301.7084; CERN-PH-EP-2013-005; LHCB-PAPER-2012-044; CERN-PH-EP-2013-005; LHCB-PAPER-2012-044.- Geneva : CERN, 2013 - 17 p. - Published in : J. Phys. G 40 (2013) 045001 IOP Open Access article: PDF; Related data file(s): ZIP; External link: Preprint
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4.
(87)
Observation of $B^+_c \rightarrow J/\psi D_s^+$ and $B^+_c \rightarrow J/\psi D_s^{*+}$ decays / LHCb Collaboration
The decays $B^+_c \rightarrow J/\psi D_s^+$ and $B^+_c \rightarrow J/\psi D_s^{*+}$ are observed for the first time using a dataset, corresponding to an integrated luminosity of 3$fb^{-1}$, collected by the LHCb experiment in proton-proton collisions at centre-of-mass energies of $\sqrt{s}$=7 and 8 TeV. The statistical significance for both signals is in excess of 9 standard deviations. [...]
arXiv:1304.4530; CERN-PH-EP-2013-051; LHCB-PAPER-2013-010; CERN-PH-EP-2013-051; LHCB-PAPER-2013-010.- Geneva : CERN, 2013-06-28 - 10 p.
- Published in : Phys. Rev. D APS Open Access article: PDF; Fulltext: PDF; Publisher’s Note: PDF; Related data file(s): ZIP; External link: Preprint
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5.
(87)
Precision measurement of $D$ meson mass differences / LHCb Collaboration
Using three- and four-body decays of $D$ mesons produced in semileptonic $b$-hadron decays, precision measurements of $D$ meson mass differences are made together with a measurement of the $D^{0}$ mass. The measurements are based on a dataset corresponding to an integrated luminosity of 1.0 fb$^{-1}$ collected in $pp$ collisions at 7~TeV. [...]
arXiv:1304.6865; CERN-PH-EP-2013-053; LHCB-PAPER-2013-011; CERN-PH-EP-2013-053; LHCB-PAPER-2013-011.- Geneva : CERN, 2013 - 18 p. - Published in : JHEP 06 (2013) 065 Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; Springer Open Access article: PDF; External link: Preprint
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6.
(86)
Measurements of the branching fractions of $B^{+} \to p \bar{p} K^{+}$ decays / LHCb Collaboration
The branching fractions of the decay $B^{+} \to p \bar p K^{+}$ for different intermediate states are measured using data, corresponding to an integrated luminosity of 1.0 fb$^{-1}$, collected by the LHCb experiment. The total branching fraction, its charmless component $(M_{p\bar p} <2.85 $ $ GeV/c^{2})$ and the branching fractions via the resonant $c\bar c$ states $\eta_{c}(1S)$ and $\psi(2S)$ relative to the decay via a $J/\psi$ intermediate state are \begin{align*} \frac{{\mathcal B}(B^{+} \to p \bar p K^{+})_{total}}{{\mathcal B}(B^{+} \to J/\psi K^{+} \to p \bar p K^{+})}=& \, 4.91 \pm 0.19 \, {(\rm stat)} \pm 0.14 \, {(\rm syst)},\\ \frac{{\mathcal B}(B^{+} \to p \bar p K^{+})_{M_{p\bar p} <2.85 {GeV/}c^{2}}}{{\mathcal B}(B^{+} \to J/\psi K^{+} \to p \bar p K^{+})}=& \, 2.02 \pm 0.10 \, {(\rm stat)}\pm 0.08 \, {(\rm syst)},\\ \frac{{\mathcal B} (B^{+} \to \eta_{c}(1S) K^{+} \to p \bar p K^{+})}{{\mathcal B}(B^{+} \to J/\psi K^{+} \to p \bar p K^{+})} = & \, 0.578 \pm 0.035 \, {(\rm stat)} \pm 0.027 \, {(\rm syst)},\\ \frac{{\mathcal B} (B^{+} \to \psi(2S) K^{+} \to p \bar p K^{+})}{{\mathcal B}(B^{+} \to J/\psi K^{+} \to p \bar p K^{+})}=& \, 0.080 \pm 0.012 \, {(\rm stat)} \pm 0.009 \, {(\rm syst)}.\\ \end{align*} Upper limits on the $B^{+}$ branching fractions into the $\eta_{c}(2S)$ meson and into the charmonium-like states $X(3872)$ and $X(3915)$ are also obtained..
arXiv:1303.7133; LHCB-PAPER-2012-047; CERN-PH-EP-2013-040; LHCB-PAPER-2012-047; CERN-PH-EP-2013-040.- Geneva : CERN, 2013-06-13 - 14 p. - Published in : Eur. Phys. J. C 73 (2013) 2462 Fulltext: PDF; Related data file(s): ZIP; Springer Open Access article: PDF; External link: Preprint
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7.
(86)
Measurement of the charge asymmetry in $B^{\pm}\rightarrow \phi K^{\pm}$ and search for $B^{\pm}\rightarrow \phi \pi^{\pm}$ decays / LHCb collaboration
The CP-violating charge asymmetry in $B^{\pm}\rightarrow \phi K^{\pm}$ decays is measured in a sample of $pp$ collisions at 7 TeV centre-of-mass energy, corresponding to an integrated luminosity of 1.0 fb$^{-1}$ collected by the LHCb experiment. The result is $\mathcal{A}_{CP}(B^{\pm}\rightarrow \phi K^{\pm}) = \rm 0.022\pm 0.021 \pm 0.009$, where the first uncertainty is statistical and the second systematic. [...]
arXiv:1309.3742; LHCB-PAPER-2013-048; CERN-PH-EP-2013-166; LHCB-PAPER-2013-048; CERN-PH-EP-2013-166.- Geneva : CERN, 2014-01-20 - 10 p. - Published in : Phys. Lett. B 728 (2014) 85-94 APS published version, local copy: PDF; Article from SCOAP3: PDF; Elsevier Open Access article: PDF; Fulltext: arXiv:1309.3742 - PDF; S0370269313009398 - XML; Related data file(s): ZIP; Related supplementary data file(s): ZIP;
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8.
(86)
Measurements of $B_c^+$ production and mass with the $B_c^+ \to J/\psi \pi^+$ decay / LHCb Collaboration
Measurements of $B_c^+$ production and mass are performed with the decay mode $B_c^+ \to J/\psi \pi^+$ using 0.37 fb$^{-1}$ of data collected in $pp$ collisions at $\sqrt{s}=7$~TeV by the LHCb experiment. The ratio of the production cross-section times branching fraction between the $B_c^+ \to J/\psi \pi^+$ and the $B^+ \to J/\psi K^+$ decays is measured to be $(0.68 \pm 0.10\,({\rm stat.}) \pm 0.03\,({\rm syst.}) \pm 0.05\,({\rm lifetime}) )\%$ for $B_c^+$ and $B^+$ mesons with transverse momenta $p_{\rm T}>4~$GeV/$c$ and pseudorapidities $2.5<\eta<4.5$. [...]
arXiv:1209.5634; LHCB-PAPER-2012-028; CERN-PH-EP-2012-275; LHCB-PAPER-2012-028; CERN-PH-EP-2012-275.- Geneva : CERN, 2012 - 15 p. - Published in : Phys. Rev. Lett. 109 (2012) 232001 APS Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint
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9.
(86)
Measurement of the fragmentation fraction ratio $f_{s}/f_{d}$ and its dependence on $B$ meson kinematics / LHCb collaboration
The relative production rate of $B^{0}_{s}$ and $B^{0}$ mesons is determined with the hadronic decays $B^{0}_{s} \rightarrow D^{-}_{s}\pi^{+}$ and $B^0 \rightarrow D^{-}K^{+}$. The measurement uses data corresponding to 1.0 fb$^{-1}$ of $pp$ collisions at a centre-of-mass energy of $\sqrt{s}=7$ TeV recorded in the forward region with the LHCb experiment. [...]
arXiv:1301.5286; CERN-PH-EP-2013-006; LHCB-PAPER-2012-037; CERN-PH-EP-2013-006; LHCB-PAPER-2012-037.- Geneva : CERN, 2013 - 18 p. - Published in : JHEP 04 (2013) 001 Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; Springer Open Access article: PDF; External link: Preprint
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10.
(86)
First observation of $CP$ violation in the decays of $B^0_s$ mesons / LHCb Collaboration
Using $pp$ collision data corresponding to an integrated luminosity of $1.0 \mathrm{fb}^{-1}$ and collected by LHCb in 2011 at a center-of-mass energy of 7 TeV, we report the measurement of direct $C\!P$ violation in $B^0_s \to K^-\pi^+$ decays, $A_{C\!P}(B^0_s \rightarrow K^- \pi^+)=0.27 \pm 0.04\,\mathrm{(stat)} \pm 0.01\,\mathrm{(syst)}$, with significance exceeding 5 standard deviations. This is the first observation of $C\!P$ violation in the decays of $B^0_s$ mesons. [...]
arXiv:1304.6173; CERN-PH-EP-2013-068; LHCB-PAPER-2013-018; CERN-PH-EP-2013-068; LHCB-PAPER-2013-018.- Geneva : CERN, 2013-05-30 - 9 p. - Published in : Phys. Rev. Lett. 110 (2013) 221601 APS Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; External links: Interactions.org article; Physics Synopsis
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