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CERN Document Server 52 записей найдено  1 - 10следующийконец  перейти к записи: Поиск длился 1.42 секунд. 
1.
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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2.
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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3.
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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4.
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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5.
Analysis of the resonant components in $\overline{B}^0_s \to J/\psi\pi^+\pi^-$ / LHCb collaboration
The decay $B^0_s \to J/\psi\pi^+\pi^-$ can be exploited to study $CP$ violation. A detailed understanding of its structure is imperative in order to optimize its usefulness. [...]
arXiv:1204.5643; CERN-PH-EP-2012-111; LHCB-PAPER-2012-005; CERN-PH-EP-2012-111; LHCB-PAPER-2012-005.- 2012 - 28 p. - Published in : Phys. Rev. D 86 (2012) 052006 APS Open Access article : PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint
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6.
Measurement of the branching fractions of the decays $B_s^0 \rightarrow D_s^\mp K^\pm$ and $B_s^0 \rightarrow D_s^- \pi^+$ / LHCb Collaboration
The decay mode $B^{0}_{s} \to D^{\mp}_{s} K^{\pm} $ allows for one of the theoretically cleanest measurements of the CKM angle $\gamma$ through the study of time-dependent $CP$ violation. This paper reports a measurement of its branching fraction relative to the Cabibbo-favoured mode $B^{0}_{s} \to D^{-}_{s} \pi^{+}$ based on a data sample of 0.37 fb$^{-1}$ proton-proton collisions at $\sqrt{s} = 7$ TeV collected in 2011 with the LHCb detector. [...]
arXiv:1204.1237; CERN-PH-EP-2012-091; LHCB-PAPER-2011-022; CERN-PH-EP-2012-091; LHCB-PAPER-2011-022.- Geneva : CERN, 2012 - 4 p. - Published in : JHEP 06 (2012) 115 Fulltext: PDF; Related data file(s): ZIP; Springer Open Access article : PDF; External link: Preprint
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7.
Measurement of the ratio of prompt $\chi_{c}$ to $J/\psi$ production in $pp$ collisions at $\sqrt{s}=7$ TeV / LHCb Collaboration
The prompt production of charmonium $\chi_{c}$ and $J/\psi$ states is studied in proton-proton collisions at a centre-of-mass energy of $\sqrt{s}=7$ TeV at the Large Hadron Collider. The $\chi_{c}$ and $J/\psi$ mesons are identified through their decays $\chi_{c}\rightarrow J/\psi \gamma$ and $J/\psi\rightarrow \mu^+\mu^-$ using 36 pb$^{-1}$ of data collected by the LHCb detector in 2010. [...]
arXiv:1204.1462; CERN-PH-EP-2012-068; LHCB-PAPER-2011-030; CERN-PH-EP-2012-068; LHCB-PAPER-2011-030.- Geneva : CERN, 2012-12-05 - 10 p. - Published in : Phys. Lett. B 718 (2012) 431-440 Elsevier Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: DURHAM
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8.
First observation of decay $B_c^+\to J/\psi \pi^+\pi^-\pi^+$ / LHCb Collaboration
The decay Bc+ --> J/psi pi+pi-pi+ is observed for the first time, using 0.8 fb-1 of pp collisions at sqrt{s}=7 TeV collected by the LHCb experiment. The ratio of branching fractions BR(Bc+ --> J/psi pi+pi-pi+)/BR(B_c+ --> J/psi pi+) is measured to be 2.41+-0.30+-0.33, where the first uncertainty is statistical and the second systematic. [...]
arXiv:1204.0079; LHCB-PAPER-2011-044; CERN-PH-EP-2012-090; LHCB-PAPER-2011-044; CERN-PH-EP-2012-090.- Geneva : CERN, 2012 - 14 p. - Published in : Phys. Rev. Lett. 108 (2012) 251802 APS Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint
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9.
Measurement of the polarization amplitudes and triple product asymmetries in the $B_s^0 \to \phi\phi$ decay / LHCb collaboration
Using 1.0 fb$^{-1}$ of pp collision data collected at a centre-of-mass energy of $\sqrt{s}$=7 TeV with the LHCb detector, measurements of the polarization amplitudes, strong phase difference and triple product asymmetries in the $B_s^0 \to \phi\phi$ decay mode are presented. The measured values are $|A_0|^2 = 0.365 \pm 0.022 (stat) \pm 0.012 (syst)$, $|A_{\perp}|^2 = 0.291 \pm 0.024 (stat) \pm 0.010 (syst)$, $cos(\delta_{\parallel}) = -0.844 \pm 0.068 (stat) \pm 0.029 (syst)$, $A_U = -0.055 \pm 0.036 (stat) \pm 0.018 (syst)$, $A_V = 0.010 \pm 0.036 (stat) \pm 0.018 (syst)$..
arXiv:1204.2813; CERN-PH-EP-2012-092; LHCB-PAPER-2012-004; CERN-PH-EP-2012-092; LHCB-PAPER-2012-004.- 2013-07-16 - 9 p. - Published in : Phys. Lett. B 713 (2012) 369-377 Elsevier Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint
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10.
Measurement of $\psi(2S)$ meson production in $pp$ collisions at $\sqrt{s}$=7 TeV / LHCb collaboration
The differential cross-section for the inclusive production of $\psi(2S)$ mesons in $pp$ collisions at $\sqrt{s}$ =7 TeV has been measured with the LHCb detector. The data sample corresponds to an integrated luminosity of 36 pb$^{-1}$ collected during 2010. [...]
arXiv:1204.1258; CERN-PH-EP-2012-094; LHCB-PAPER-2011-045.- 2012-08-10 - 23 p. Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP; Springer Open Access article: PDF; External link: Preprint
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