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CERN Document Server Sök i 2,050 journaler efter:  1 - 10nästaslut  gå till journal: Sökningen tog 3.55 sekunder. 
1.
(100)
Search for rare $B^0_{(s)}\rightarrow \mu^+ \mu^- \mu^+ \mu^-$ decays / LHCb Collaboration
A search for the decays $B^0_{s}\rightarrow \mu^+ \mu^- \mu^+ \mu^-$ and $B^0 \rightarrow \mu^+ \mu^- \mu^+ \mu^-$ is performed using data, corresponding to an integrated luminosity of 1.0 fb$^{-1}$, collected with the LHCb detector in 2011. The number of candidates observed is consistent with the expected background and, assuming phase-space models of the decays, limits on the branching fractions are set: ${\cal B}(B^0_{s}\rightarrow \mu^+ \mu^- \mu^+ \mu^-) < 1.6 \ (1.2) \times 10^{-8}$ and ${\cal B}(B^0 \rightarrow \mu^+ \mu^- \mu^+ \mu^-)< 6.6 \ (5.3) \times 10^{-9}$ at 95% (90%) confidence level. [...]
arXiv:1303.1092; CERN-PH-EP-2013-031; LHCB-PAPER-2012-049; CERN-PH-EP-2013-031; LHCB-PAPER-2012-049.- Geneva : CERN, 2013 - 6 p. - Published in : Phys. Rev. Lett. 110 (2013) 1528276 APS Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint
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2.
(91)
First Evidence for the Decay $B^0_s \to \mu^+\mu^-$ / LHCb Collaboration
A search for the rare decays $B^0_s \to \mu^+\mu^-$ and $B^0 \to \mu^+\mu^-$ is performed using data collected in 2011 and 2012 with the LHCb experiment at the Large Hadron Collider. The data samples comprise 1.1 fb$^{-1}$ of proton-proton collisions at $\sqrt{s}$ = 8 TeV and 1.0 fb$^{-1}$ at $\sqrt{s}$=7 TeV. [...]
arXiv:1211.2674; CERN-PH-EP-2012-335; LHCB-PAPER-2012-043; CERN-PH-EP-2012-335; LHCB-PAPER-2012-043.- Geneva : CERN, 2013-01-07 - 9 p. - Published in : Phys. Rev. Lett. 110 (2013) 021801 APS Open Access article: PDF; Fulltext: PDF; Related supplementary data file(s): ZIP; External link: Preprint
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3.
(91)
Measurement of the $C\!P$ asymmetry in $B^0 \to K^{*0} \mu^+ \mu^-$ decays / LHCb Collaboration
A measurement of the $C\!P$ asymmetry in $B^0 \rightarrow K^{*0} \mu^+ \mu^-$ decays is presented, based on 1.0$\mbox{\,fb}^{-1}$ of $pp$ collision data recorded by the LHCb experiment during 2011. The measurement is performed in six bins of invariant mass squared of the $\mu^+\mu^-$ pair, excluding the $\mathrm{J}\mskip -3mu/\mskip -2mu\psi\mskip 2mu$ and $\psi(2S)$ resonance regions. [...]
arXiv:1210.4492; LHCB-PAPER-2012-021; CERN-PH-EP-2012-302; LHCB-PAPER-2012-021; CERN-PH-EP-2012-302.- Geneva : CERN, 2013-01-17 - 8 p. - Published in : Phys. Rev. Lett. 110 (2013) 031801 APS Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint
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4.
(90)
Measurement of the $B^0$--$\bar B^0$ oscillation frequency $\Delta m_d$ with the decays $B^0 \to D^- \pi^+$ and $B^0 \to J\ \psi K^{*0}$ / LHCb Collaboration
The $B^0$--$\bar B^0$ oscillation frequency $\Delta m_d$ is measured by the LHCb experiment using a dataset corresponding to an integrated luminosity of $1.0\,$fb$^{-1}$ of proton-proton collisions at $\sqrt{s} = 7\,$TeV, and is found to be $\Delta m_d = 0.5156 \pm 0.0051\,($stat.$) \pm 0.0033\,($syst.$)\,$ps$^{-1}$. The measurement is based on results from analyses of the decays $B^0 \to D^- \pi^+$ ($D^- \to K^+ \pi^- \pi^-$) and $B^0 \to J\ \psi K^{*0}$ ($J\ \psi \to \mu^+ \mu^-$, $K^{*0} \to K^+ \pi^-$) and their charge conjugated modes..
arXiv:1210.6750; LHCB-PAPER-2012-032; CERN-PH-EP-2012-315; LHCB-PAPER-2012-032; CERN-PH-EP-2012-315.- Geneva : CERN, 2013-07-16 - 8 p. - Published in : Phys. Lett. B 719 (2013) 318-325 APS published version, local copy: PDF; Elsevier Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint
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5.
(90)
Differential branching fraction and angular analysis of the $B^+ \to K^+ \mu^+ \mu^-$ decay / LHCb Collaboration
The angular distribution and differential branching fraction of the decay $B^+ \to K^+ \mu^+\mu^-$ are studied with a dataset corresponding to 1.0 fb$^{-1}$ of integrated luminosity, collected by the LHCb experiment. The angular distribution is measured in bins of dimuon invariant mass squared and found to be consistent with Standard Model expectations. [...]
arXiv:1209.4284; LHCB-PAPER-2012-024; CERN-PH-EP-2012-263; LHCB-PAPER-2012-024; CERN-PH-EP-2012-263.- Geneva : CERN, 2013 - 17 p. - Published in : JHEP 02 (2013) 105 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.
(87)
Differential branching fraction and angular analysis of the decay $B^{0} \rightarrow K^{*0} \mu^+ \mu^-$ / LHCb Collaboration
The angular distributions and the partial branching fraction of the decay $B^{0} \rightarrow K^{*0} \mu^+ \mu^-$ are studied using an integrated luminosity of $0.37\,fb^{-1}$ of data collected with the LHCb detector. The forward-backward asymmetry of the muons, $A_{\mathrm{FB}}$, the fraction of longitudinal polarisation, $F_{\mathrm{L}}$, and the partial branching fraction, $\mathrm{d}{\mathcal B}/\mathrm{d}q^{2}$, are determined as a function of the dimuon invariant mass. [...]
arXiv:1112.3515; LHCB-PAPER-2011-020; CERN-PH-EP-2011-211; LHCB-PAPER-2011-020; CERN-PH-EP-2011-211.- Geneva : CERN, 2012 - 11 p. - Published in : Phys. Rev. Lett. 108 (2012) 181806 APS Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint
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7.
(86)
Searches for violation of lepton flavour and baryon number in tau lepton decays at LHCb / LHCb Collaboration
Searches for the lepton flavour violating decay $\tau^-\to \mu^-\mu^+\mu^-$ and the lepton flavour and baryon number violating decays $\tau^-\to \bar{p}\mu^+\mu^-$ and $\tau^-\to p\mu^-\mu^-$ have been carried out using proton-proton collision data, corresponding to an integrated luminosity of $1.0$ fb$^{-1}$, taken by the LHCb experiment at $\sqrt{s} = 7$ TeV. No evidence has been found for any signal, and limits have been set at $90\%$ confidence level on the branching fractions: $\cal B(\tau^-\to \mu^-\mu^+\mu^-) < 8.0 \times 10^{-8}$, $\cal B(\tau^-\to \bar{p}\mu^+\mu^-) < 3.3 \times 10^{-7}$ and $\cal B(\tau^-\to p\mu^-\mu^-) < 4.4 \times 10^{-7}$. [...]
arXiv:1304.4518; LHCB-PAPER-2013-014; CERN-PH-EP-2013-062; LHCB-PAPER-2013-014; CERN-PH-EP-2013-062.- Geneva : CERN, 2013-07-09 - 10 p. - Published in : Phys. Lett. B 724 (2013) 36-45 Elsevier Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; External link: Preprint
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8.
(85)
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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9.
(85)
Search for $D^{+}_{(s)} \rightarrow \pi^{+} \mu^{+} \mu^{-}$ and $D^{+}_{(s)} \rightarrow \pi^{-} \mu^{+} \mu^{+}$ decays / LHCb Collaboration
A search for non-resonant $D^{+}_{(s)} \rightarrow \pi^{+} \mu^{+} \mu^{-}$ and $D^{+}_{(s)} \rightarrow \pi^{-} \mu^{+} \mu^{+}$ decays is performed using proton-proton collision data, corresponding to an integrated luminosity of 1.0 fb$^{-1}$, at $\sqrt{s}=7$ TeV recorded by the LHCb experiment in 2011. No signals are observed and the $90\% \, (95\%)$ confidence level (CL) limits on the branching fractions are found to be \begin{eqnarray*} \mathcal{B}(D^{+} \rightarrow \pi^{+} \mu^{+} \mu^{-}) < 7.3 \, (8.3) \times 10^{-8},\\ \mathcal{B}(D^{+}_{s} \rightarrow \pi^{+} \mu^{+} \mu^{-}) < 4.1 \, (4.8) \times 10^{-7},\\ \mathcal{B}(D^{+} \rightarrow \pi^{-} \mu^{+} \mu^{+}) < 2.2 \, (2.5) \times 10^{-8},\\ \mathcal{B}(D^{+}_{s} \rightarrow \pi^{-} \mu^{+} \mu^{+}) < 1.2 \, (1.4) \times 10^{-7}.\\ \end{eqnarray*} These limits are the most stringent to date..
arXiv:1304.6365; LHCB-PAPER-2012-051; CERN-PH-EP-2013-061; LHCB-PAPER-2012-051; CERN-PH-EP-2013-061.- Geneva : CERN, 2013-07-23 - 21 p. - Published in : Phys. Lett. B 724 (2013) 203-212 Elsevier Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; External link: Preprint
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10.
(85)
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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