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1.
First observation of the $B_{s2}^\ast(5840)^0 \to B^{\ast+} K^-$ and studies of excited $B^0_s$ mesons / LHCb Collaboration
Properties of the orbitally excited (L=1) $B_s$ states are studied using 1.0 fb$^{-1}$ of pp collisions at $\sqrt{s} =7$ TeV collected with the LHCb detector. The first observation of the $B_{s2}^*(5840)^0$ meson decaying to $B^{*+} K^-$ is reported, and the corresponding branching fraction measured relative to the $B^+ K^-$ decay mode. [...]
arXiv:1211.5994; LHCB-PAPER-2012-030; CERN-PH-EP-2012-340; LHCB-PAPER-2012-030; CERN-PH-EP-2012-340.- Geneva : CERN, 2013-04-09 - 9 p. - Published in : Phys. Rev. Lett. 110 (2013) 151803 APS Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint
2.
Measurement of the time-dependent $CP$ asymmetry in $B^0 \to J/\psi K^0_{\rm S}$ decays / LHCb Collaboration
This Letter reports a measurement of the $CP$ violation observables $S_{J/\psi K^0_{\rm S}}$ and $C_{J/\psi K^0_{\rm S}}$ in the decay channel $B^0 \rightarrow J/\psi K^0_{\rm S}$ performed with 1.0 fb$^{-1}$ of $pp$ collisions at $\sqrt{s}=7$ TeV collected by the LHCb experiment. The fit to the data yields $S_{J/\psi K^0_{\rm S}}= 0.73 \pm 0.07 {\rm (stat)} \pm 0.04 {\rm (syst)}$ and $C_{J/\psi K^0_{\rm S}}= 0.03 \pm 0.09 {\rm (stat)} \pm 0.01 {\rm (syst)}$. [...]
arXiv:1211.6093; LHCB-PAPER-2012-035; CERN-PH-EP-2012-331; LHCB-PAPER-2012-035; CERN-PH-EP-2012-331.- Geneva : CERN, 2013-04-10 - 16 p. - Published in : Phys. Lett. B 721 (2013) 24-31 Elsevier Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint
3.
First observation of the decays $\bar{B}^0_{(s)}\to D_s^+K^-\pi^+\pi^-$ and $\bar{B}^0_s\to D_{s1}(2536)^+\pi^-$ / LHCb collaboration
The first observation of the decays $\bar{B}^0_{s}\to D_s^+K^-\pi^+\pi^-$ and $\bar{B}^0\to D_s^+K^-\pi^+\pi^-$ are reported using an integrated luminosity of 1.0 fb$^{-1}$ recorded by the LHCb experiment. The branching fractions, normalized with respect to $\bar{B}^0_{s}\to D_s^+\pi^-\pi^+\pi^-$ and $\bar{B}^0_{s}\to D_s^+K^-\pi^+\pi^-$, respectively, are measured to be $\frac{B(\bar{B}^0_{s}\to D_s^+K^-\pi^+\pi^-)}{B(\bar{B}^0_{s}\to D_s^+\pi^-\pi^+\pi^-)} = (5.2\pm0.5\pm0.3)\times10^{-2}$, $\frac{B(\bar{B}^0\to D_s^+K^-\pi^+\pi^-)}{B(\bar{B}^0_{s}\to D_s^+K^-\pi^+\pi^-)} = 0.54\pm0.07\pm0.07$, where the first uncertainty is statistical and the second is systematic. [...]
arXiv:1211.1541; LHCB-PAPER-2012-033; CERN-PH-EP-2012-327; LHCB-PAPER-2012-033; CERN-PH-EP-2012-327.- 2012 - 17 p. - Published in : Phys. Rev. D 86 (2012) 112005 APS Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint
4.
A study of the $Z$ production cross-section in $pp$ collisions at $\sqrt{s}$ = 7 TeV using tau final states / LHCb Collaboration
A measurement of the inclusive $Z \to \tau\tau$ cross-section in $pp$ collisions at $\sqrt{s} = 7$ TeV is presented based on a dataset of 1.0 fb$^{-1}$ collected by the LHCb detector. Candidates for $Z \to \tau\tau$ decays are identified through reconstructed final states with two muons, a muon and an electron, a muon and a hadron, or an electron and a hadron. [...]
arXiv:1210.6289; LHCB-PAPER-2012-029; CERN-PH-EP-2012-314; LHCB-PAPER-2012-029; CERN-PH-EP-2012-314.- Geneva : CERN, 2013 - 15 p. - Published in : JHEP 01 (2013) 111 Fulltext: PDF; Related data file(s): ZIP; Springer Open Access article: PDF; External link: Preprint
5.
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
6.
First observation of the decay $B^+ \to \pi^+ \mu^+\mu^-$ / LHCb Collaboration
A discovery of the rare decay $B^{+} \rightarrow \pi^{+} \mu^{+} \mu^{-}$ is presented. This decay is observed for the first time, with 5.2 $\sigma$ significance. [...]
arXiv:1210.2645; LHCB-PAPER-2012-020; CERN-PH-EP-2012-284; LHCB-PAPER-2012-020; CERN-PH-EP-2012-284.- Geneva : CERN, 2012 - 20 p. - Published in : JHEP 12 (2012) 125 Fulltext: PDF; Related data file(s): ZIP; Springer Open Access article: PDF; External link: Preprint
7.
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
8.
Measurement of the $D^\pm$ production asymmetry in 7 TeV $pp$ collisions / LHCb Collaboration
The asymmetry in the production cross-section $\sigma$ of $D^{\pm}$ mesons, \begin{equation*} A_{\mathrm{P}} = \frac{\sigma(D^+) - \sigma(D^-) }{ \sigma(D^+) + \sigma(D^-) }, \end{equation*} is measured in bins of pseudorapidity $\eta$ and transverse momentum $p_{\mathrm{T}}$ within the acceptance of the LHCb detector. The result is obtained with a sample of $D^+ \to K^{0}_{S}\pi^+$ decays corresponding to an integrated luminosity of 1.0~fb$^{-1}$, collected in $pp$ collisions at a centre of mass energy of 7~TeV at the Large Hadron Collider. [...]
arXiv:1210.4112; LHCB-PAPER-2012-026; CERN-PH-EP-2012-305; LHCB-PAPER-2012-026; CERN-PH-EP-2012-305.- Geneva : CERN, 2013-01-08 - 18 p. - Published in : Phys. Lett. B 718 (2013) 902-909 Elsevier Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint
9.
Evidence for the decay $B^0 \to J/\psi \omega$ and measurement of the relative branching fractions of $B^0_s$ meson decays to $J/\psi \eta$ and $J/\psi \eta'$ / LHCb Collaboration
First evidence of the $\mathrm{B}^0\to J/\psi\omega$ decay is found and the $\mathrm{B}_{s}^0\to J/\psi\eta$ and $\mathrm{B}_{s}^0\to J/\psi\eta^{\prime}$ decays are studied using a dataset corresponding to an integrated luminosity of 1.0~$\mathrm{fb}^{-1}$ collected by the LHCb experiment in proton-proton collisions at a centre-of-mass energy of $\sqrt{s} = 7$~TeV. The branching fractions of these decays are measured relative to that of the $\mathrm{B}^0\to J/\psi\rho^0$ decay: %The following ratios are measured \begin{equation} \begin{array}{lll} \frac{\mathcal{B}(\mathrm{B}^0\to J/\psi\omega)}{\mathcal{B}(\mathrm{B}^0\to J/\psi\rho^0)} $=$ \:0.89 \pm0.19\,(\mathrm{stat})\,^{+0.07}_{-0.13}\,(\mathrm{syst}),\nonumber \\ \frac{\mathcal{B}(\mathrm{B}^0_s\to J/\psi\eta)}{\mathcal{B}(\mathrm{B}^0\to J/\psi\rho^0)} $=$ \:14.0 \pm 1.2\,(\mathrm{stat})\,^{+1.1}_{-1.5}\,(\mathrm{syst})\,^{+1.1}_{-1.0}\left(\frac{f_\mathrm{d}}{f_\mathrm{s}}\right),\nonumber \\ \frac{\mathcal{B}(\mathrm{B}^0_s\to J/\psi\eta^{\prime})}{\mathcal{B}(\mathrm{B}^0\to J/\psi\rho^0)} $=$ \:12.7\pm1.1\,(\mathrm{stat})\,^{+0.5}_{-1.3}\,(\mathrm{syst})\,^{+1.0}_{-0.9}\left(\frac{f_\mathrm{d}}{f_\mathrm{s}}\right),\nonumber \end{array} \end{equation} where the last uncertainty is due to the knowledge of $f_\mathrm{d}/f_\mathrm{s}$, the ratio of b-quark hadronization factors that accounts for the different production rate of $\mathrm{B}^0$ and $\mathrm{B}^0_s$ mesons [...]
arXiv:1210.2631; CERN-PH-EP-2012-287; LHCB-PAPER-2012-022; CERN-PH-EP2012-287; CERN-PH-EP-2012-287; LHCB-PAPER-2012-022.- Geneva : CERN, 2013-02-21 - 23 p. - Published in : Nucl. Phys. B 867 (2013) 547-566 Elsevier Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint
10.
First evidence for the annihilation decay mode $B^{+} \to D_{s}^{+} \phi$ / LHCb Collaboration
Evidence for the hadronic annihilation decay mode $B^{+} \to D_s^{+}\phi$ is found with greater than $3\sigma$ significance. The branching fraction and \CP asymmetry are measured to be \begin{eqnarray} \mathcal{B}(B^{+} \to D_s^{+}\phi) &=& \left(1.87^{\,+1.25}_{\,-0.73}\,({\rm stat}) \pm 0.19\, ({\rm syst}) \pm 0.32\, ({\rm norm})\right) \times 10^{-6}, \nonumber\\ \mathcal{A}_{CP}(B^{+} \to D_s^{+}\phi) &=& -0.01 \pm 0.41\, ({\rm stat}) \pm 0.03\, ({\rm syst}). [...]
arXiv:1210.1089; CERN-PH-EP-2012-286; LHCB-PAPER-2012-025; CERN-PH-EP-2012-286; LHCB-PAPER-2012-025.- Geneva : CERN, 2013 - 19 p. - Published in : JHEP 02 (2013) 043 Fulltext: PDF; Related data file(s): ZIP; Springer Open Access article: PDF; External link: Preprint

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41 Magnin, J.
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