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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2020-11-23
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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2020-11-18
11:57 |
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2020-11-05
15:52 |
Study of $B_s^0 \to J/\psi \pi^+ \pi^- K^+ K^-$ decays
/ LHCb Collaboration
The decays $B^0_s \rightarrow J/\psi \pi^+\pi^- K^+ K^-$ are studied using a data set corresponding to an integrated luminosity of 9 fb$^{-1}$, collected with the LHCb detector in proton-proton collisions at centre-of-mass energies of 7, 8 and 13 TeV. The decays $B^0_s \rightarrow J/\psi K^{\ast0} \bar{K}^{\ast0}$ and $B^0_s \rightarrow \chi_{c1}(3872)K^+K^-$, where the $K^+K^-$ pair does not originate from a $\phi$ meson, are observed for the first time [...]
arXiv:2011.01867; LHCb-PAPER-2020-35; CERN-EP-2020-192; LHCB-PAPER-2020-035.-
Geneva : CERN, 2021-02-02 - 34 p.
- Published in : JHEP 2102 (2021) 024
Article from SCOAP3: PDF; Fulltext: 2011.01867 - PDF; LHCb-PAPER-2020-035 - PDF; Related data file(s): ZIP; Supplementary information: ZIP;
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2020-10-28
10:53 |
Observation of a new $\Xi_b^0$ state
/ LHCb Collaboration
Using a proton-proton collision data sample collected by the LHCb experiment, corresponding to an integrated luminosity of 8.5~fb$^{-1}$, the observation of a new excited $\Xi_b^0$ resonance decaying to the $\Xi_b^-\pi^+$ final state is presented. The state, referred to as $\Xi_b(6227)^0$, has a measured mass and natural width of $m(\Xi_b(6227)^0) = 6227.1^{\,+1.4}_{\,-1.5}\pm0.5$ MeV, $\Gamma(\Xi_b(6227)^0) = 18.6^{\,+5.0}_{\,-4.1}\pm1.4$ MeV, where the uncertainties are statistical and systematic. [...]
arXiv:2010.14485; LHCb-PAPER-2020-032; CERN-EP-2020-190; LHCB-PAPER-2020-032.-
Geneva : CERN, 2021-01-07 - 17 p.
- Published in : Phys. Rev. D 103 (2021) 012004
Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP; Supplementary information: ZIP;
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2020-10-23
15:39 |
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2020-10-21
10:46 |
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2020-10-19
16:13 |
Measurement of the CKM angle $\gamma$ in $B^\pm\to D K^\pm$ and $B^\pm \to D \pi^\pm$ decays with $D \to K_\mathrm S^0 h^+ h^-$
/ LHCb Collaboration
A measurement of $CP$-violating observables is performed using the decays ${B^\pm\to D K^\pm}$ and ${B^\pm\to D \pi^\pm}$, where the $D$ meson is reconstructed in one of the self-conjugate three-body final states $K_{\mathrm S}^0\pi^+\pi^-$ and $K_{\mathrm S}^0K^+K^-$ (commonly denoted $K_{\mathrm S}^0 h^+h^-$). The decays are analysed in bins of the $D$-decay phase space, leading to a measurement that is independent of the modelling of the $D$-decay amplitude. [...]
arXiv:2010.08483; LHCb-PAPER-2020-019; CERN-EP-2020-175; LHCB-PAPER-2020-019.-
Geneva : CERN, 2021-02-19 - 36 p.
- Published in : JHEP 2102 (2021) 169
Article from SCOAP3: PDF; Fulltext: 2010.08483 - PDF; LHCb-PAPER-2020-019_arxiv_submission - PDF; Related data files: ZIP; Supplementary information: ZIP;
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2020-10-14
10:06 |
Strong constraints on the $b \to s\gamma$ photon polarisation from $B^0\to K^{*0} e^+ e^-$ decays
/ LHCb Collaboration
An angular analysis of the $B^0 \to K^{*0} e^+ e^-$ decay is performed using a data sample corresponding to an integrated luminosity of $9~fb^{-1}$ of $pp$ collisions collected with the LHCb experiment. The analysis is conducted in the very low dielectron mass squared ($q^2$) interval between $0.0008$ and $0.257~{\rm GeV}^2$, where the rate is dominated by the $B^0\to K^{*0}\gamma$ transition with a virtual photon [...]
arXiv:2010.06011; LHCb-PAPER-2020-020; CERN-EP-2020-176; LHCB-PAPER-2020-020.-
Geneva : CERN, 2020-12-11 - 25 p.
- Published in : JHEP 2012 (2020) 081
Article from SCOAP3: PDF; Fulltext: LHCb-PAPER-2020-020 - PDF; 2010.06011 - PDF; Related data file(s): ZIP;
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