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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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3.
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Observation of the suppressed ADS modes $B^\pm \to [\pi^\pm K^\mp \pi^+\pi^-]_D K^\pm$ and $B^\pm \to [\pi^\pm K^\mp \pi^+\pi^-]_D \pi^\pm$
/ LHCb Collaboration
An analysis of $B^{\pm}\to DK^{\pm}$ and $B^{\pm}\to D\pi^{\pm}$ decays is presented where the $D$ meson is reconstructed in the four-body final state $K^{\pm}\pi^{\mp} \pi^+ \pi^-$. Using LHCb data corresponding to an integrated luminosity of $1.0{\rm \,fb}^{-1}$, first observations are made of the suppressed ADS modes $B^{\pm}\to [\pi^{\pm} K^{\mp}\pi^+\pi^-]_D K^{\pm}$ and $B^{\pm}\to [\pi^{\pm} K^{\mp} \pi^+\pi^- ]_D\pi^{\pm}$ with a significance of $5.1\sigma$ and greater than $10\sigma$, respectively. [...]
arXiv:1303.4646; CERN-PH-EP-2013-038; LHCB-PAPER-2012-055; CERN-PH-EP-2013-038; LHCB-PAPER-2012-055.-
Geneva : CERN, 2013-06-10 - 14 p.
- Published in : Phys. Lett. B 723 (2013) 44-53
Elsevier Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint
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4.
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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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5.
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Observation of the $B^0_{s}\to\psi{(2\mathrm{S})}\eta$ and $B^0_{(s)}\to\psi{(2\mathrm{S})}\pi^+\pi^-$ decays
/ LHCb Collaboration
First observations of the $B^0_s \rightarrow \psi(2S) \eta$, $B^0 \rightarrow \psi(2S) \pi^+ \pi^-$ and $B^0_s \rightarrow \psi(2S) \pi^+ \pi^-$ decays are made using a dataset corresponding to an integrated luminosity of 1.0 $fb^{-1}$ collected by the LHCb experiment in proton-proton collisions at a centre-of-mass energy of $\sqrt{s}=7$ TeV. The ratios of the branching fractions of each of the $\psi(2S)$ modes with respect to the corresponding $J/\psi$ decays are \[ \frac{\mathcal{B}(B^0_s \rightarrow \psi(2S) \eta) }{\mathcal{B}(B^0_s \rightarrow J/\psi \eta)} =0.83\pm0.14\,(stat)\pm0.12\,(syst)\pm0.02\,(\mathcal{B}), \] \[ \frac{\mathcal{B}(B^0 \rightarrow \psi(2S) \pi^+ \pi^-)}{\mathcal{B}(B^0 \rightarrow J/\psi \pi^+ \pi^-)} =0.56\pm0.07\,(stat)\pm0.05\,(syst)\pm0.01\,(\mathcal{B}), \] \[ \frac{\mathcal{B}(B^0_s \rightarrow \psi(2S) \pi^+ \pi^-)}{\mathcal{B}(B^0_s \rightarrow J/\psi \pi^+ \pi^-)} =0.34\pm0.04\,(stat)\pm0.03\,(syst)\pm0.01\,(\mathcal{B}), \] where the third uncertainty corresponds to the uncertainties of the dilepton branching fractions of the $J/\psi$ and $\psi$(2S) meson decays..
arXiv:1302.6354; CERN-PH-EP-2013-024; LHCB-PAPER-2012-053; CERN-PH-EP-2013-024; LHCB-PAPER-2012-053.-
Geneva : CERN, 2013-06-21 - 16 p.
- Published in : Nucl. Phys. B 871 (2013) 403-419
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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6.
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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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7.
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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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8.
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Study of $D_{sJ}$ decays to $D^+K^0_{\rm S}$ and $D^0K^+$ final states in $pp$ collisions
/ LHCb Collaboration
A study of $D^+K_S^0$ and $D^0K^+$ final states is performed in a sample of 1.0 fb$^{-1}$ of $pp$ collision data collected at a centre-of-mass energy of $\sqrt{s}=7$ TeV with the LHCb detector. We confirm the existence of the $D_{s1}^*(2700)^+$ and $D_{sJ}^*(2860)^+$ excited states and measure their masses and widths to be \begin{eqnarray} m(D_{s1}^*(2700)^+) &=& 2709.2 \pm 1.9(\mbox{stat})\pm\,\,\,4.5(\mbox{syst})~{\rm MeV}/c^2,\cr \Gamma(D_{s1}^*(2700)^+) &=& \,\,\,115.8 \pm 7.3(\mbox{stat}) \pm12.1(\mbox{syst})~{\rm MeV}/c^2,\cr m(D_{sJ}^*(2860)^+) &=& 2866.1 \pm 1.0(\mbox{stat}) \pm\,\,\,6.3(\mbox{syst})~{\rm MeV}/c^2,\cr \Gamma(D_{sJ}^*(2860)^+) &=& \,\,\,\,\,\,69.9 \pm 3.2(\mbox{stat}) \pm\,\,\,6.6(\mbox{syst})~{\rm MeV}/c^2.\cr\nonumber \end{eqnarray}
arXiv:1207.6016; CERN-PH-EP-2012-181; LHCB-PAPER-2012-016; CERN-PH-EP-2012-181; LHCB-PAPER-2012-016.-
Geneva : CERN, 2012 - 12 p.
- Published in : JHEP 10 (2012) 151
Fulltext: PDF; Related data file(s): ZIP; Springer Open Access article: PDF; External link: Preprint
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Measurement of the cross-section for $Z\to e^+e^-$ production in $pp$ collisions at $\sqrt{s} =7$ TeV
/ LHCb Collaboration
A measurement of the cross-section for pp$ \rightarrow$Z$ \rightarrow$e$^+$e$^-$ is presented using data at $\sqrt{s}=7$ TeV corresponding to an integrated luminosity of 0.94 fb$^{-1}$. The process is measured within the kinematic acceptance $p_{\mathrm{T}}>20$GeV/$c$ and $2<\eta<4.5$ for the daughter electrons and dielectron invariant mass in the range 60-120 GeV/$c^2$. [...]
arXiv:1212.4620; CERN-PH-EP-2012-363; LHCB-PAPER-2012-036; CERN-PH-EP-2012-363; LHCB-PAPER-2012-036.-
Geneva : CERN, 2013 - 22 p.
- Published in : JHEP 02 (2013) 106
APS published version, local copy: PDF; Fulltext: arXiv:1212.4620 - PDF; LHCb-PAPER-2012-036 - PDF; Related data file(s): ZIP; Springer Open Access article: PDF; External link: Rivet analyses reference
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10.
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Measurement of the polarization amplitudes in $B^0 \to J/\psi K^{*}(892)^0$ decays
/ LHCb collaboration
An analysis of the decay $B^0 \to J/\psi K^{*}(892)^0$ is presented using data, corresponding to an integrated luminosity of 1.0 fb$^{-1}$, collected in $pp$ collisions at a centre-of-mass energy of 7TeV with the LHCb detector. The polarisation amplitudes and the corresponding phases are measured to be \[ \begin{array}{cclllllll} |A_{\parallel}|^2 &\;=\; & 0.227 &\pm & 0.004 & \text{(stat.)} &\pm & 0.011 & \text{(syst.)}, \\ |A_{\perp}|^2 &\;=\; & 0.201 &\pm & 0.004 & \text{(stat.)} &\pm & 0.008&\text{(syst.)},\\ \delta_{\parallel}\; \text{[rad]} &\;=\; & -2.94 &\pm & 0.02 &\text{(stat.)} &\pm &0.03&\text{(syst.)},\\ \delta_{\perp}\; \text{[rad]} &\;=\; & \phantom{-}2.94 &\pm & 0.02 &\text{(stat.)} &\pm &0.02&\text{(syst.)}.\\ \end{array} \] Comparing $B^0\to J/\psi K^{*}(892){^0}$ and $\overline{B}^0\to J/\psi \overline K^{*}(892){^0}$ decays, no evidence for direct CP violation is found..
arXiv:1307.2782; CERN-PH-EP-2013-104; LHCB-PAPER-2013-023; CERN-PH-EP-2013-104; LHCB-PAPER-2013-023.-
Geneva : CERN, 2013-09-03 - 12 p.
- Published in : Phys. Rev. D 88 (2013) 052002
APS Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint
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