2021-03-18
20:11 |
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2021-01-05
09:46 |
Observation of the $B_s^0 \rightarrow D^{\ast \pm} D^{\mp}$ decay
/ LHCb Collaboration
A search for the $B^0_s \!\rightarrow D^{*\pm} D^\mp$ decay is performed using proton-proton collision data at centre-of-mass energies of $7$, $8$ and $13\,\text{TeV}$ collected by the LHCb experiment, corresponding to an integrated luminosity of $9\,\text{fb}^{-1}$. The decay is observed with a high significance and its branching fraction relative to the $B^0 \!\rightarrow D^{*\pm} D^\mp$ decay is measured to be \begin{align*} \frac{\mathcal{B}(B_s^0 \rightarrow D^{\ast \pm} D^{\mp}) }{\mathcal{B}(B^0 \rightarrow D^{\ast \pm} D^{\mp}) } = 0.137 \pm 0.017 \pm 0.002 \pm 0.006 \,, \end{align*} where the first uncertainty is statistical, the second systematic and the third is due to the uncertainty on the ratio of the $B_s^0$ and $B^0$ hadronisation fractions..
arXiv:2012.11341; LHCb-PAPER-2020-037; CERN-EP-2020-230.-
2021-03-09 - 19 p.
- Published in : JHEP 2103 (2021) 099
Article from SCOAP3: PDF; Fulltext: 2012.11341 - PDF; LHCb-PAPER-2020-037 - PDF; Related data file(s): ZIP; Supplementary information: ZIP;
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2021-01-04
13:51 |
Measurement of CP violation in the decay $B^{+} \rightarrow K^{+} \pi^{0}$
/ LHCb Collaboration
A measurement of direct CP violation in the decay $B^{+} \rightarrow K^{+} \pi^{0}$ is reported using a data sample corresponding to an integrated luminosity of 5.4 $\textrm{fb}^{-1}$, collected with the LHCb experiment at a center-of-mass energy of $\sqrt{s}=13$ TeV. The CP asymmetry is measured to be $0.025 \pm 0.015 \pm 0.006 \pm 0.003$, where the uncertainties are statistical, systematic, and due to an external input, respectively. [...]
arXiv:2012.12789; LHCb-PAPER-2020-040; CERN-EP-2020-242.-
2021-03-02 - 11 p.
- Published in : Phys. Rev. Lett. 126 (2021) 091802
Article from SCOAP3: PDF; Fulltext: 2012.12789 - PDF; LHCb-PAPER-2020-040_arXiv - PDF; Related data file(s): ZIP; supplementary information: ZIP;
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2020-12-10
14:24 |
Observation of $CP$ violation in two-body $B_{(\mathrm{s})}^{\,0}$-meson decays to charged pions and kaons
/ LHCb Collaboration
The time-dependent $CP$ asymmetries of $B^0\to \pi^+\pi^-$ and $B^0_\mathrm{s}\!\to K^+K^-$ decays are measured using a data sample of $pp$ collisions corresponding to an integrated luminosity of 1.9 fb$^{-1}$, collected with the LHCb detector at a centre-of-mass energy of 13 TeV. The results are \begin{eqnarray*} C_{\pi\pi} & = & -0.311 \pm 0.045 \pm 0.015, \newline S_{\pi\pi} & = & -0.706 \pm 0.042 \pm 0.013, \newline C_{KK} & = & \phantom{-}0.164 \pm 0.034 \pm 0.014, \newline S_{KK} & = & \phantom{-}0.123 \pm 0.034 \pm 0.015, \newline \cal {A}^{\Delta\Gamma}_{KK} & = & -0.83\phantom{0} \pm 0.05\phantom{0} \pm 0.09, \end{eqnarray*} where the first uncertainties are statistical and the second systematic. [...]
arXiv:2012.05319; LHCb-PAPER-2020-029; CERN-EP-2020-215; LHCB-PAPER-2020-029.-
Geneva : CERN, 2021-03-08 - 43 p.
- Published in : JHEP 2103 (2021) 075
Article from SCOAP3: PDF; Fulltext: 2012.05319 - PDF; LHCb-PAPER-2020-029 - PDF; Related data file(s): ZIP; External link: Previous draft version
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2020-12-10
11:44 |
First observation of the decay $B_s^0 \to K^-\mu^+\nu_\mu$ and measurement of $|V_{ub}|/|V_{cb}|$
/ LHCb Collaboration
The first observation of the suppressed semileptonic $B_s^0 \to K^-\mu^+\nu_\mu$ decay is reported. Using a data sample recorded in $pp$ collisions in 2012 with the LHCb detector, corresponding to an integrated luminosity of 2 $\mathrm{fb}^{-1}$, the branching fraction $\mathcal{B}(B_s^0 \to K^-\mu^+\nu_\mu)$} is measured to be $(1.06\pm0.05~(\mathrm{stat})\pm0.08~(\mathrm{syst}))\times 10^{-4}$, where the first uncertainty is statistical and the second one represents the combined systematic uncertainties. [...]
arXiv:2012.05143; LHCb-PAPER-2020-038; CERN-EP-2020-224; LHCB-PAPER-2020-038.-
Geneva : CERN, 2021-02-25 - 11 p.
- Published in : Phys. Rev. Lett. 126 (2021) 081804
Article from SCOAP3: PDF; Fulltext: LHCb-PAPER-2020-038 - PDF; 2012.05143 - PDF; Related data file(s): ZIP; Supplementary information: ZIP;
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2020-12-08
11:53 |
Amplitude analysis of the $B^+ \to D^+ D^- K^+$ decay
/ LHCb Collaboration
Results are reported from an amplitude analysis of the $B^+\to D^+D^-K^+$ decay. The analysis is carried out using LHCb proton-proton collision data taken at $\sqrt{s}=7,8,$ and $13$ TeV, corresponding to a total integrated luminosity of 9 fb$^{-1}$. [...]
arXiv:2009.00026; LHCb-PAPER-2020-025; CERN-EP-2020-159.-
2020-12-07 - 48 p.
- Published in : Phys. Rev. D 102 (2020) 112003
Article from SCOAP3: PDF; Fulltext: main_PRD - PDF; 2009.00026 - PDF; Related data file(s): ZIP; Supplementary information: ZIP;
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2020-12-07
15:32 |
Search for long-lived particles decaying to $e^{\pm} \mu^{\mp} \nu$
/ LHCb Collaboration
Long-lived particles decaying to $e^\pm \mu^\mp \nu$, with masses between 7 and 50 GeV/c$^2$ and lifetimes between 2 and 50 ps, are searched for by looking at displaced vertices containing electrons and muons of opposite charges. The search is performed using 5.4 fb$^{-1}$ of $pp$ collisions collected with the LHCb detector at a centre-of-mass energy of $\sqrt{s} = 13$ TeV. [...]
arXiv:2012.02696; LHCb-PAPER-2020-027; CERN-EP-2020-212.-
Geneva : CERN, 2021-03-26 - 16 p.
- Published in : Eur. Phys. J. C 81 (2021) 261
Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP; Supplementary information: ZIP;
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2020-11-30
12:03 |
Observation of the $\varLambda^{0}_{b}\to\varLambda^{+}_{c}K^{+}K^{-}\pi^{-}$ decay
/ LHCb Collaboration
The $\varLambda^{0}_{b}\to\varLambda^{+}_{c}K^{+}K^{-}\pi^{-}$ decay is observed for the first time using a data sample of proton-proton collisions at centre-of-mass energies of $\sqrt{s}=7$ and 8 $\rm{TeV}$ collected by the $\mbox{LHCb}$ detector, corresponding to an integrated luminosity of $3{\rm{fb}^{-1}}$. The ratio of branching fractions between the $\varLambda^{0}_{b}\to\varLambda^{+}_{c}K^{+}K^{-}\pi^{-}$ and the $\varLambda^{0}_{b}\to\varLambda^{+}_{c}D^{-}_{s}$ decays is measured to be \begin{equation*} \frac{\mathcal{B} ( \varLambda^{0}_{b}\to\varLambda^{+}_{c}K^{+}K^{-}\pi^{-}) } {\mathcal{B} ( \varLambda^{0}_{b}\to\varLambda^{+}_{c} D^{-}_{s})} = (9.26 \pm 0.29 \pm 0.46 \pm 0.26)\times10^{-2}, \end{equation*} where the first uncertainty is statistical, the second systematic and the third is due to the knowledge of the $D^{-}_{s}\to K^{+}K^{-}\pi^{-}$ branching fraction. [...]
arXiv:2011.13738; LHCb-PAPER-2020-028; CERN-EP-2020-209; LHCB-PAPER-2020-028; LHCB-PAPER-2020-028.-
Geneva : CERN, 2021-04-10 - 20 p.
- Published in : Phys. Lett. B 815 (2021) 136172
Article from SCOAP3: PDF; Fulltext: PAPER-LHCb-2020-028-arXiv - PDF; 2011.13738 - PDF; Related data file(s): ZIP;
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2020-11-25
14:42 |
Measurement of the CKM angle $\gamma$ and $B_s^0-\overline{B_s^0}$ mixing frequency with $B_s^0 \to D_s^{\mp} h^{\pm} \pi^{\pm}\pi^{\mp}$ decays
/ LHCb Collaboration
The CKM angle $\gamma$ is measured for the first time from mixing-induced $CP$ violation between $B^0_s \rightarrow D_s^\mp K^\pm \pi^\pm \pi^\mp$ and $\bar{B}^0_s \rightarrow D_s^\pm K^\mp \pi^\mp \pi^\pm$ decays reconstructed in proton-proton collision data corresponding to an integrated luminosity of 9 ${\rm fb}^{-1}$ recorded with the LHCb detector. A time-dependent amplitude analysis is performed to extract the $CP$-violating weak phase $\gamma-2\beta_s$ and, subsequently, $\gamma$ by taking the $B^0_s$-$\bar{B}^0_s$ mixing phase $\beta_{s}$ as an external input. [...]
arXiv:2011.12041; LHCb-PAPER-2020-030; CERN-EP-2020-214; LHCB-PAPER-2020-030.-
Geneva : CERN, 2021-03-15 - 46 p.
- Published in : JHEP 2103 (2021) 137
Article from SCOAP3: PDF; Fulltext: LHCb-PAPER-2020-030_arxiv - PDF; 2011.12041 - PDF; Related data file(s): ZIP; Supplementary information: ZIP;
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2020-11-23
08:58 |
Stochastic cooling pickup/kicker developments for the High-precision Spectrometer Ring in the HIAF Project at IMP
/ Zhu, Guangyu (Lanzhou, Inst. Modern Phys. ; Beijing, GUCAS) ; Wu, Junxia (Lanzhou, Inst. Modern Phys. ; Beijing, GUCAS) ; Caspers, Fritz (CERN) ; Du, Ze (Lanzhou, Inst. Modern Phys. ; Beijing, GUCAS) ; Wei, Yuan (Lanzhou, Inst. Modern Phys. ; Beijing, GUCAS) ; Yang, Jiancheng (Lanzhou, Inst. Modern Phys. ; Beijing, GUCAS) ; Hu, Xuejing (Lanzhou, Inst. Modern Phys. ; Beijing, GUCAS) ; Zhang, Yong (Lanzhou, Inst. Modern Phys. ; Beijing, GUCAS) ; Xie, Hongming (Lanzhou, Inst. Modern Phys. ; Beijing, GUCAS) ; Jing, Long (Lanzhou, Inst. Modern Phys. ; Beijing, GUCAS) et al.
Stochastic cooling of the Spectrometer Ring (SRing) at the High Intensity heavy-ion Accelerator Facility (HIAF) project in China, which is used mainly for experiments with radioactive fragment beams, is applied to speed up the cooling process of a stored ion beam. In this study, both a Faltin traveling wave structure and a novel slot-ring standing wave structure based on a ceramic vacuum chamber are discussed and evaluated for the pickup/kicker of the SRing stochastic cooling system. [...]
CERN-OPEN-2020-014.-
2021 - 12 p.
- Published in : IEEE Trans. Nucl. Sci. 68 (2020) 9-20
Fulltext from publisher: PDF;
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