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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

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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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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

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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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Search for the rare decay $K_{\rm\scriptscriptstyle S}^0\rightarrow\mu^{+}\mu^{-}$ / LHCb Collaboration
A search for the decay

$K_{\rm\scriptscriptstyle S}^0\rightarrow\mu^{+}\mu^{-}$ is performed, based on a data sample of 1.0\,fb

$^{-1}$ of

$pp$ collisions at

$\sqrt{s}$ = 7\,TeV collected by the LHCb experiment at the Large Hadron Collider. The observed number of candidates is consistent with the background-only hypothesis, yielding an upper limit of

$\mathcal{B}(K_{\rm\scriptscriptstyle S}^0\rightarrow\mu^{+}\mu^{-}) < 11 (9)\times10^{-9}$ at 95 (90)

$\%$ confidence level. [...]
arXiv:1209.4029; CERN-PH-EP-2012-267; LHCB-PAPER-2012-023; CERN-PH-EP-2012-267; LHCB-PAPER-2012-023.- Geneva : CERN, 2013 - 19 p. - Published in : JHEP 01 (2013) 090 Fulltext: PDF; Related data file(s): ZIP; Springer Open Access article: PDF; External link: Preprint

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Measurement of the fraction of $\Upsilon(1S)$ originating from $\chi_b(1P)$ decays in $pp$ collisions at $\sqrt{s}$ = 7 TeV / LHCb Collaboration
The production of

$\chi_b(1P)$ mesons in

$pp$ collisions at a centre-of-mass energy of 7 TeV is studied using 32 pb

$^{-1}$ of data collected with the LHCb detector. The

$\chi_b(1P)$ mesons are reconstructed in the decay mode

$\chi_b(1P) \to \Upsilon(1S)\gamma \to \mu^+\mu^-\gamma$ . [...]
arXiv:1209.0282; CERN-PH-EP-2012-237; LHCB-PAPER-2012-015; CERN-PH-EP-2012-237; LHCB-PAPER-2012-015.- Geneva : CERN, 2012 - 15 p. - Published in : JHEP 11 (2012) 031 Fulltext: PDF; Related data file(s): ZIP; Springer Open Access article: PDF; External link: Preprint

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Measurement of the ratio of branching fractions $B(B^0 \to K^{\ast 0} \gamma) / B(B^0_s \to \phi \gamma)$ and the direct $C\!P$ asymmetry in $B^0 \to K^{\ast 0} \gamma$ / LHCb Collaboration
The ratio of branching fractions of the radiative B decays B0 -> K*0 gamma and Bs0 phi gamma has been measured using an integrated luminosity of 1.0 fb-1 of pp collision data collected by the LHCb experiment at a centre-of-mass energy of sqrt(s)=7 TeV. The value obtained is BR(B0 -> K*0 gamma)/BR(Bs0 -> phi gamma) = 1.23 +/- 0.06(stat.) +/- 0.04(syst.) +/- 0.10(fs/fd), where the first uncertainty is statistical, the second is the experimental systematic uncertainty and the third is associated with the ratio of fragmentation fractions fs/fd. [...]
arXiv:1209.0313; LHCB-PAPER-2012-019; CERN-PH-EP-2012-247; LHCB-PAPER-2012-019; CERN-PH-EP-2012-247.- Geneva : CERN, 2013-02-01 - 21 p. - Published in : Nucl. Phys. B 867 (2013) 1-18 Elsevier Open Access article: LHCb-1-18 - PDF; npb.867.1 - PDF; Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; External link: Preprint

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Measurement of the $B^0_s \rightarrow J/\psi \bar{K}^{*0}$ branching fraction and angular amplitudes / LHCb collaboration
A sample of 114±11

$B_s^0 → J/ψK^-π^+$ signal events obtained with 0.37 fb

$^{-1}$ of pp collisions at √s=7 TeV collected by the LHCb experiment is used to measure the branching fraction and polarization amplitudes of the

$B_s^0 → J/ψK̅ ^{*0}$ decay, with

$K̅ ^{*0} → K^-π^+$ . The

$K^-π^+$ mass spectrum of the candidates in the

$B_s^0$ peak is dominated by the

$K̅ ^{*0}$ contribution. [...]
arXiv:1208.0738; CERN-PH-EP-2012-214; LHCB-PAPER-2012-014; CERN-PH-EP-2012-214; LHCB-PAPER-2012-014.- 2012-10-08 - 16 p. - Published in : Phys. Rev. D 86 (2012) 071102 APS Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint

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Observation of $B^0 \to \bar{D}^0 K^+ K^-$ and evidence of $B^0_s \to \bar{D}^0 K^+ K^-$ / LHCb Collaboration
The first observation of the decay

$B^{0} \to \overline{D}^{0}K^{+}K^{-}$ is reported from an analysis of

$0.62 \ \mathrm{fb}^{-1}$ of

$pp$ collision data collected with the LHCb detector. Its branching fraction is measured relative to that of the topologically similar decay

$B^{0} \to \overline{D}^{0}\pi^{+}\pi^{-}$ to be

$\frac{ {\cal B}\left(B^{0} \to \overline{D}^{0}K^{+}K^{-}\right)}{ {\cal B}\left(B^{0} \to \overline{D}^{0}\pi^{+}\pi^{-}\right)} = 0.056 \pm 0.011 \pm 0.007$ , where the first uncertainty is statistical and the second is systematic. [...]
arXiv:1207.5991; LHCB-PAPER-2012-018; CERN-PH-EP-2012-198; LHCB-PAPER-2012-018; CERN-PH-EP-2012-198.- Geneva : CERN, 2012-09-26 - 15 p. - Published in : Phys. Rev. Lett. 109 (2012) 131801 APS Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; Supplementary data: ZIP; External link: Preprint

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10.

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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Voir aussi: noms d'auteurs similaires
1	Huston, R.S
40	Huston, R.S.
1	Huston, Ronald
1	Huston, Ronald L
2	Huston, Ronald L.

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