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LHCb Papers

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2013-05-17
11:55
Study of $B^{0} \rightarrow D^{*-}\pi^{+}\pi^{-}\pi^{+}$ and $B^{0} \rightarrow D^{*-}K^{+}\pi^{-}\pi^{+}$ decays / LHCb Collaboration
Using proton-proton collision data collected by the LHCb experiment at $\sqrt{s} =$ 7 TeV, corresponding to an integrated luminosity of 1.0 fb$^{-1}$, the ratio of branching fractions of the $B^{0}\rightarrow D^{*-}\pi^{+}\pi^{-}\pi^{+}$ decay relative to the $B^{0} \rightarrow D^{*-}\pi^{+}$ decay is measured to be \begin{equation*} \frac{\mathcal{B}(B^{0}\rightarrow D^{*-}\pi^{+}\pi^{-}\pi^{+})}{\mathcal{B}(B^{0} \rightarrow D^{*-}\pi^{+})} = 2.64 \pm 0.04\,(\text{stat.}) \pm 0.13\,(\text{syst.})\, . \label{eq:CF_BF_ratio_result} \end{equation*} The Cabibbo-suppressed decay $B^{0}\rightarrow D^{*-}K^{+}\pi^{-}\pi^{+}$ is observed for the first time and the measured ratio of branching fractions is \begin{equation*} \frac{\mathcal{B}(B^{0}\rightarrow D^{*-}K^{+}\pi^{-}\pi^{+})}{\mathcal{B}(B^{0} \rightarrow D^{*-}\pi^{+}\pi^{-}\pi^{+})} = (6.47 \pm 0.37\,(\text{stat.}) \pm 0.35\,(\text{syst.})) \times 10^{-2} \label{eq:CS_BF_ratio_result}\, . [...]
arXiv:1303.6861; LHCB-PAPER-2012-046; CERN-PH-EP-2013-041.- Geneva : CERN, 2013 - 17 p. - Published in : Phys. Rev. D 87 (2013) 092001 APS Open Access article: PDF; Related data file(s): ZIP; External link: Preprint

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2013-05-10
11:57
Differential branching fraction and angular analysis of the decay $B_s^0 \to \phi \mu^+\mu^-$ / LHCb Collaboration
The determination of the differential branching fraction and the first angular analysis of the decay $B_s^0\to\phi\mu^{+}\mu^{-}$ are presented using data, corresponding to an integrated luminosity of $1.0\,{\rm fb}^{-1}$, collected by the LHCb experiment at $\sqrt{s}=7\,{\rm TeV}$. [...]
arXiv:1305.2168 ; CERN-PH-EP-2013-078 ; LHCB-PAPER-2013-017. - 2013. - 19 p.
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2013-05-06
14:51
Production of $J/\psi$ and $\Upsilon$ mesons in $pp$ collisions at $\sqrt{s}$ = 8 TeV / LHCb Collaboration
The production of $J/\psi$ and $\Upsilon$ mesons in $pp$ collisions at $\sqrt{s}$ = 8 TeV is studied with the LHCb detector. [...]
arXiv:1304.6977 ; CERN-PH-EP-2013-071 ; LHCB-PAPER-2013-016. - 2013. - 35 p.
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2013-05-02
14:05
Measurement of the $B^0 \to K^{*0}e^+e^-$ branching fraction at low dilepton mass / LHCb Collaboration
The branching fraction of the rate decay $B^0 \rightarrow K^{*0}e^+e^-$ in the dilepton mass region from 30 to 1000 MeV$/c^2$ has been measured by the LHCb experiment, using $pp$ collision data, corresponding to an integrated luminosity of 1.0 fb$^{-1}$, at a centre-of-mass energy of 7 TeV. [...]
arXiv:1304.3035 ; LHCB-PAPER-2013-005 ; CERN-PH-EP-2013-048. - 2013. - 19 p.
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2013-04-26
10:49
Precision measurement of $D$ meson mass differences / LHCb Collaboration
Using three- and four-body decays of $D$ mesons produced in semileptonic $b$-hadron decays, precision measurements of $D$ meson mass differences are made together with a measurement of the $D^{0}$ mass. [...]
arXiv:1304.6865 ; CERN-PH-EP-2013-053 ; LHCB-PAPER-2013-011. - 2013. - 18 p.
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2013-04-25
17:19
First observation of $CP$ violation in the decays of $B^0_s$ mesons / LHCb Collaboration
Using $pp$ collision data, corresponding to an integrated luminosity of $1.0~\mathrm{fb}^{-1}$, collected by LHCb in 2011 at a center-of-mass energy of $7\!$ TeV, we report the measurement of direct $C\!P$ violation in $B^0_s \to K^-\pi^+$ decays, $A_{C\!P}(B^0_s \rightarrow K^- \pi^+)=0.27 \pm 0.04\,\mathrm{(stat)} \pm 0.01\,\mathrm{(syst)}$, with significance exceeding five standard deviations. [...]
arXiv:1304.6173 ; CERN-PH-EP-2013-068 ; LHCB-PAPER-2013-018. - 2013. - 9 p.
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2013-04-25
10:41
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. [...]
arXiv:1303.7133 ; LHCB-PAPER-2012-047 ; CERN-PH-EP-2013-040. - 2013. - 20 p.
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2013-04-25
09:14
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. [...]
arXiv:1304.6365 ; LHCB-PAPER-2012-051 ; CERN-PH-EP-2013-061. - 2013. - 21 p.
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2013-04-24
17:41
Measurement of the branching fractions of the decays $B^0_s \rightarrow \overline{D}^0 K^- \pi^+$ and $B^0 \rightarrow \overline{D}^0 K^+ \pi^-$ / LHCb Collaboration
The first observation of the decay $B^0_s \rightarrow \overline{D}^0 K^-\pi^+$ is reported [...]
arXiv:1304.6317 ; LHCB-PAPER-2013-022 ; CERN-PH-EP-2013-070. - 2013. - 18 p.
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2013-04-23
16:41
Precision measurement of the $B^0_s - \bar{B}^0_s$ oscillation frequency with the decay $B^0_s \to D^-_s \pi^+$ / LHCb Collaboration
A key ingredient to searches for physics beyond the Standard Model in $B^{0}_{s}$ mixing phenomena is the measurement of the $B^{0}_{s}$-$\bar{B}^{0}_{s}$ oscillation frequency, which is equivalent to the mass difference $\Delta m_{s}$ of the $B^{0}_{s}$ mass eigenstates. [...]
arXiv:1304.4741 ; CERN-PH-EP-2013-054 ; LHCB-PAPER-2013-006. - 2013. - 18 p.
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