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CERN Document Server 59 záznamov nájdených  1 - 10ďalšíkoniec  skoč na záznam: Hľadanie trvalo 0.62 sekúnd. 
1.
Measurement of the effective $B_s^0 \to K^+ K^-$ lifetime / LHCb Collaboration
A precise determination of the effective $B_s^0 \rightarrow K^+ K^-$ lifetime can be used to constrain contributions from physics beyond the Standard Model in the $B_s^0$ meson system. Conventional approaches select $B$ meson decay products that are significantly displaced from the $B$ meson production vertex [...]
arXiv:1207.5993; LHCB-PAPER-2012-013; CERN-PH-EP-2012-172; LHCB-PAPER-2012-013; CERN-PH-EP-2012-172.- Geneva : CERN, 2012-10-02 - 8 p. - Published in : Phys. Lett. B 716 (2012) 393-400 Elsevier Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint
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2.
Measurement of prompt hadron production ratios in $pp$ collisions at $\sqrt{s} = $ 0.9 and 7 TeV / LHCb Collaboration
The charged-particle production ratios $\bar{p}/p$, $K^-/K^+$, $\pi^-/\pi^+$, $(p + \bar{p})/(\pi^+ + \pi^-)$, $(K^+ + K^-)/(\pi^+ + \pi^-)$ and $(p + \bar{p})/(K^+ + K^-)$ are measured with the LHCb detector using $0.3\,{\rm nb^{-1}}$ of $pp$ collisions delivered by the LHC at $\sqrt{s} = 0.9$~TeV and $1.8\,{\rm nb^{-1}}$ at $\sqrt{s} = 7$~TeV. The measurements are performed as a function of transverse momentum $p_{\rm T}$ and pseudorapidity $\eta$. [...]
arXiv:1206.5160; CERN-PH-EP-2012-171; LHCB-PAPER-2011-037; LHCB-PAPER-2011-037; CERN-PH-EP-2012-171.- Geneva : CERN, 2012-10-05 - 30 p. - Published in : Eur. Phys. J. C 72 (2012) 2168 Fulltext: PDF; Related data file(s): ZIP; Springer Open Access article: PDF; External link: Rivet analyses reference
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3.
Measurement of $b$-hadron branching fractions for two-body decays into charmless charged hadrons / LHCb Collaboration
Based on data corresponding to an integrated luminosity of 0.37 fb^-1 collected by the LHCb experiment in 2011, the following ratios of branching fractions are measured: B(B0 -> pi+ pi-) / B(B0 -> K+pi-) = 0.262 +/- 0.009 +/- 0.017, (fs/fd) * B(Bs -> K+K-) / B(B^0 -> K+pi-) = 0.316 +/- 0.009 +/- 0.019, (fs/fd) * B(Bs ->pi+ K-) / B(B0 -> K+pi-) = 0.074 +/- 0.006 +/- 0.006, (fd/fs) * B(B0 -> K+K-) / B(Bs -> K+K-) = 0.018 {+ 0.008 - 0.007} +/- 0.009, (fs/fd) * B(Bs -> pi+pi-) / B(B0 -> pi+pi-) = 0.050 {+ 0.011 - 0.009} +/- 0.004, B(Lambda_b -> p pi-) / B(Lambda_b -> p K-) = 0.86 +/- 0.08 +/- 0.05, where the first uncertainties are statistical and the second systematic. Using the current world average of B(B0 -> K+pi-) and the ratio of the strange to light neutral B meson production fs/fd measured by LHCb, we obtain: B(B0 -> pi+pi-) = (5.08 +/- 0.17 +/- 0.37) x 10^-6, B(Bs -> K+K-) = (23.0 +/- 0.7 +/- 2.3) x 10^-6, B(Bs -> pi+K-) = (5.4 +/- 0.4 +/- 0.6) x 10^-6, B(B0 -> K+K-) = (0.11 {+ 0.05 - 0.04} +/- 0.06) x 10^-6, B(Bs -> pi+pi-) = (0.95 {+ 0.21 - 0.17} +/- 0.13) x 10^-6. [...]
arXiv:1206.2794; LHCB-PAPER-2012-002; CERN-PH-EP-2012-161; LHCB-PAPER-2012-002; CERN-PH-EP-2012-161.- Geneva : CERN, 2012 - 15 p. - Published in : JHEP 10 (2012) 037 Fulltext: PDF; Related data file(s): ZIP; Springer Open Access article: PDF; External link: Preprint
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4.
Observation of excited $\Lambda^0_b$ baryons / LHCb Collaboration
Using $pp$ collision data corresponding to 1.0~fb^{-1} integrated luminosity collected by the LHCb detector, two narrow states are observed in the $\Lambda_b^0\pi^+\pi^-$ spectrum with masses $5911.95\pm 0.12(\mbox{stat})\pm 0.03(\mbox{syst})\pm 0.66(\Lambda_b^0\mbox{ mass})$ MeV/$c^2$ and $5919.76\pm 0.07(\mbox{stat})\pm 0.02(\mbox{syst})\pm 0.66(\Lambda_b^0\mbox{ mass})$ MeV/$c^2$. The significances of the observations are 4.9 and 10.1 standard deviations, respectively. [...]
arXiv:1205.3452; CERN-PH-EP-2012-128; LHCB-PAPER-2012-012; LHCB-PAPER-2012-12; LHCB-PAPER-2012-012; CERN-PH-EP-2012-128.- Geneva : CERN, 2012 - 15 p. - Published in : Phys. Rev. Lett. 109 (2012) 172003 APS Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint
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5.
Observation of double charm production involving open charm in pp collisions at $\sqrt{s}$=7 TeV / LHCb collaboration
The production of $J/\psi$ mesons accompanied by open charm, and of pairs of open charm hadrons are observed in pp collisions at a centre-of-mass energy of 7 TeV using an integrated luminosity of $355pb^{-1}$ collected with the LHCb detector. Model independent measurements of absolute cross-sections are given together with ratios to the measured $J/\psi$ and open charm cross-sections. [...]
arXiv:1205.0975; CERN-PH-EP-2012-109; LHCB-PAPER-2012-003; CERN-PH-EP-2012-109; LHCB-PAPER-2012-003.- 2012 - 41 p.
Addendum: PDF; Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP; Springer Open Access article: PDF; External link: Preprint
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6.
Measurement of the $B_s^0\to J/\psi K_S^0$ branching fraction / LHCb collaboration
The $B_s^0\to J/\psi K_S^0$ branching fraction is measured in a data sample corresponding to 0.41$fb^{-1}$ of integrated luminosity collected with the LHCb detector at the LHC. This channel is sensitive to the penguin contributions affecting the sin2$\beta$ measurement from $B^0\to J/\psi K_S^0$ The time-integrated branching fraction is measured to be $BF(B_s^0\to J/\psi K_S^0)=(1.83\pm0.28)\times10^{-5}$. [...]
arXiv:1205.0934; CERN-PH-EP-2012-115; LHCB-PAPER-2011-041; CERN-PH-EP-2012-115; LHCB-PAPER-2011-041.- 2013-07-16 - 8 p. - Published in : Phys. Lett. B 713 (2012) 172-179 Elsevier Open Access article : PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint
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7.
Measurement of relative branching fractions of B decays to $\psi(2S)$ and $J/\psi$ mesons / LHCb collaboration
The relative rates of B-meson decays into $J/\psi$ and $\psi(2S)$ mesons are measured for the three decay modes in pp collisions recorded with the LHCb detector. The ratios of branching fractions ($\mathcal{B}$) are measured to be \begin{equation*} \begin{array}{lll} \frac{\mathcal{B}( B^+ \to \psi(2S) K^+)}{\mathcal{B}( B^+ \to J/\psi K^+ )} &=& 0.594 \pm 0.006 (stat) \pm 0.016 (syst) \pm 0.015\,(R_{\psi}), \\ \frac{\mathcal{B}( B^0 \to \psi(2S) K^{*0})}{\mathcal{B}( B^0 \to J/\psi K^{*0})} &=& 0.476 \pm 0.014 (stat) \pm 0.010 (syst) \pm 0.012\,(R_{\psi}), \\ \frac{\mathcal{B}^{0}_{s}( B^0_s \to \psi(2S)\phi)}{\mathcal{B}( B^0_s \to J/\psi\phi)} &=& 0.489 \pm 0.026 (stat) \pm 0.021 (syst) \pm 0.012\,(R_{\psi}), \end{array} \end{equation*} where the third uncertainty is from the ratio of the $\psi(2S)$ and $J/\psi$ branching fractions to $\mu\mu$..
arXiv:1205.0918; CERN-PH-EP-2012-113; LHCB-PAPER-2012-010; CERN-PH-EP-2012-113; LHCB-PAPER-2012-010.- 2012-08-29 - 14 p. - Published in : Eur. Phys. J. C 72 (2012) 2118 Fulltext: PDF; Related data file(s): ZIP; Springer Open Access article: PDF; External link: Preprint
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8.
Measurement of the $D_s^+ - D_s^-$ production asymmetry in 7 TeV pp collisions / LHCb collaboration
Heavy quark production in 7 TeV centre-of-mass energy pp collisions at the LHC is not necessarily flavour symmetric. The production asymmetry, A_P, between Ds+ and Ds- mesons is studied using the \phi\pi(+/-) decay mode in a data sample of 1.0/fb collected with the LHCb detector. [...]
arXiv:1205.0897; CERN-PH-EP-2012-114; LHCB-PAPER-2012-009; CERN-PH-EP-2012-114; LHCB-PAPER-2012-009.- 2013-07-16 - 10 p. - Published in : Phys. Lett. B 713 (2012) 186-195 Elsevier Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint
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9.
Measurement of the isospin asymmetry in $B \to K^{(*)}\mu^+ \mu^-$ decays / LHCb Collaboration
The isospin asymmetries of $B \to K^{(*)}\mu^+\mu^-$ decays and the partial branching fractions of $B^0 \to K^0\mu^+\mu^-$ and $B^+ \to K^{*+}\mu^+\mu^-$ are measured as a function of the di-muon mass squared $q^2$ using an integrated luminosity of 1.0 fb$^{-1}$ collected with the LHCb detector. The $B \to K\mu^+\mu^-$ isospin asymmetry integrated over $q^2$ is negative, deviating from zero with over 4 $\sigma$ significance. [...]
arXiv:1205.3422; CERN-PH-EP-2012-129; LHCB-PAPER-2012-011; CERN-PH-EP-2012-129; LHCB-PAPER-2012-011.- Geneva : CERN, 2012 - 21 p. - Published in : JHEP 07 (2012) 133 Figures file: ZIP; Fulltext: PDF; Springer Open Access article: PDF; Supplementary information: ZIP; External link: Preprint
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10.
Measurement of the CP-violating phase $\phi_s$ in $\overline{B}^0_s \to J/\psi\pi^+\pi^-$ decays / LHCb collaboration
Measurement of the mixing-induced $CP$-violating phase $\phi_s$ in $B^0_s$ decays is of prime importance in probing new physics. Here $7421 \pm 105$ signal events from the dominantly $CP$-odd final state $J/\psi\pi^+\pi^-$ are selected in 1 fb$^{-1}$ of $pp$ collision data collected at sqrt{s} = 7 TeV with the LHCb detector. [...]
arXiv:1204.5675; CERN-PH-EP-2012-107; LHCb-PAPER-2012-006; LHCb-PAPER-2012-006; CERN-PH-EP-2012-107.- 2013-07-16 - 9 p. - Published in : Phys. Lett. B 713 (2012) 378-386 Elsevier Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint
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