2020-01-06
15:42 |
First observation of excited $\Omega_b^-$ states
/ LHCb Collaboration
We report four narrow peaks in the $\Xi_b^0K^-$ mass spectrum obtained using $pp$ collisions at center-of-mass energies of 7, 8 and 13 TeV, corresponding to a total integrated luminosity of 9 fb$^{-1}$ recorded by the LHCb experiment. Referring to these states by their mass, the mass values are \begin{align*} m(\Omega_b(6316)^-) &= 6315.64\pm0.31\pm0.07\pm0.50 {\rm MeV}, \\ m(\Omega_b(6330)^-) &= 6330.30\pm0.28\pm0.07\pm0.50 {\rm MeV}, \\ m(\Omega_b(6340)^-) &= 6339.71\pm0.26\pm0.05\pm0.50 {\rm MeV}, \\ m(\Omega_b(6350)^-) &= 6349.88\pm0.35\pm0.05\pm0.50 {\rm MeV}, \end{align*}where the uncertainties are statistical, systematic and the last is due to the knowledge of the $\Xi_b^0$ mass. [...]
arXiv:2001.00851; LHCb-PAPER-2019-042; CERN-EP-2019-278; LHCB-PAPER-2019-042.-
Geneva : CERN, 2020-02-26 - 12 p.
- Published in : Phys. Rev. Lett. 124 (2020) 082002
Article from SCOAP3: PDF; Fulltext: LHCb-PAPER-2019-042 - PDF; 2001.00851 - PDF; Related data file(s): ZIP; Supplementary information: ZIP;
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2019-12-05
10:43 |
Isospin amplitudes in $\Lambda_b^0\to J/\psi \Lambda(\Sigma^0)$ and $\Xi_b^0\to J/\psi \Xi^0(\Lambda)$ decays
/ LHCb Collaboration
Ratios of isospin amplitudes in hadron decays are a useful probe of the interplay between weak and strong interactions, and allow searches for physics beyond the Standard Model. We present the first results on isospin amplitudes in $b$-baryon decays, using data corresponding to an integrated luminosity of 8.5 fb$^{-1}$, collected with the LHCb detector in $pp$ collisions at center of mass energies of 7, 8 and 13 TeV. [...]
arXiv:1912.02110; CERN-EP-2019-268; LHCb-PAPER-2019-039; LHCB-PAPER-2019-039-003; LHCB-PAPER-2019-039.-
Geneva : CERN, 2020-03-17 - 11 p.
- Published in : Phys. Rev. Lett. 124 (2020) 111802
Fulltext: 1912.02110 - PDF; DI-PRL-cascade - PDF; Fulltext from Publisher: PDF; Related data file(s): ZIP;
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2019-11-21
13:46 |
Precision measurement of the $\Xi_{cc}^{++}$ mass
/ LHCb Collaboration
A measurement of the $\Xi_{cc}^{++}$ mass is performed using data collected by the LHCb experiment between 2016 and 2018 in $pp$ collisions at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.6 $\mathrm{fb}^{-1}$. The $\Xi_{cc}^{++}$ candidates are reconstructed via the decay modes $\Xi_{cc}^{++}\to\Lambda_c^+K^-\pi^+\pi^+$ and $\Xi_{cc}^{++}\to\Xi_c^+\pi^+$. [...]
arXiv:1911.08594; LHCb-PAPER-2019-037; CERN-EP-2019-258; LHCB-PAPER-2019-037.-
2020-02-07 - 18 p.
- Published in : JHEP 2002 (2020) 049
Article from SCOAP3: PDF; Fulltext: LHCb-PAPER-2019-037_arXiv - PDF; 1911.08594 - PDF; Related data file(s): ZIP; Supplementary Information: ZIP;
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2019-11-15
09:29 |
Registre complet - Registres semblants
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2019-11-12
12:18 |
Measurement of the $\eta_c(1S)$ production cross-section in $pp$ collisions at $\sqrt{s} = 13$ TeV
/ LHCb Collaboration
Using a data sample corresponding to an integrated luminosity of $2.0\,fb^{-1}$, collected by the LHCb experiment, the production of the $\eta_c(1S)$ state in proton-proton collisions at a centre-of-mass energy of $\sqrt{s}=13 \text{ TeV}$ is studied in the rapidity range ${2.0 < y < 4.5}$ and in the transverse momentum range ${6.5 < p_{T} < 14.0\text{ GeV}}$. The cross-section for prompt production of $\eta_c(1S)$ mesons relative to that of the $J/\psi$ meson is measured using the ${p\bar{p}}$ decay mode and is found to be ${\sigma_{\eta_c(1S)}/\sigma_{J/\psi} = 1.69 \pm 0.15 \pm 0.10 \pm 0.18}$. [...]
arXiv:1911.03326; LHCb-PAPER-2019-024; CERN-EP-2019-214; LHCB-PAPER-2019-024.-
2020-03-02 - 29 p.
- Published in : Eur. Phys. J. C 80 (2020) 191
Article from SCOAP3: PDF; Fulltext: 1911.03326 - PDF; LHCb_PAPER_2019_024 - PDF; Related data file(s): ZIP; Supplementary information: ZIP;
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2019-11-04
11:32 |
Updated measurement of decay-time-dependent CP asymmetries in $D^0 \to K^+K^-$ and $D^0 \to \pi^+\pi^-$ decays
/ LHCb Collaboration
A search for decay-time-dependent charge-parity ($CP$) asymmetry in $D^0 \to K^+K^-$ and $D^0 \to \pi^+\pi^-$ decays is performed at the LHCb experiment using proton-proton collision data recorded at a center-of-mass energy of 13TeV, and corresponding to an integrated luminosity of 5.4fb$^{-1}$. The $D^0$ mesons are required to originate from semileptonic decays of $b$ hadrons, such that the charge of the muon identifies the flavor of the neutral $D$ meson at production. [...]
arXiv:1911.01114; CERN-EP-2019-225; LHCb-PAPER-2019-032; LHCB-PAPER-2019-032.-
Geneva : CERN, 2020-01-14 - 12 p.
- Published in : Phys. Rev. D 101 (2020) 012005
Article from SCOAP3: PDF; Figures: ZIP; Fulltext: LHCb-PAPER-2019-032 - PDF; 1911.01114 - PDF; Supplementary information: ZIP; External link: Figures
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2019-10-22
16:33 |
Measurement of $f_s / f_u$ variation with proton-proton collision energy and $B$-meson kinematics
/ LHCb Collaboration
The ratio of the $B^0_s$ and $B^+$ fragmentation fractions $f_s$ and $f_u$ is studied with $B^0_s \to J/\psi \phi$ and $B^+ \to J/\psi K^+$ decays using data collected by the LHCb experiment in proton-proton collisions at 7, 8 and 13 TeV center-of-mass energies. The analysis is performed in bins of $B$-meson momentum, longitudinal momentum, transverse momentum, pseudorapidity and rapidity. [...]
arXiv:1910.09934; CERN-EP-2019-209; LHCb-PAPER-2019-020; LHCB-PAPER-2019-020.-
Geneva : CERN, 2020-03-26 - 11 p.
- Published in : Phys. Rev. Lett. 124 (2020) 122002
Article from SCOAP3: scoap3-fulltext - PDF; 4a6db7d1849f361e0a2d3bda0b7927d6 - PDF; Fulltext: LHCb-PAPER-2019-020_arXiv - PDF; 1910.09934 - PDF; Related data files: ZIP;
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2019-10-16
15:11 |
Search for $A' \to \mu^+ \mu^-$ decays
/ LHCb Collaboration
Searches are performed for both prompt-like and long-lived dark photons, $A'$, produced in proton-proton collisions at a center-of-mass energy of 13 TeV. These searches look for $A'\!\to\!\mu^+\mu^-$ decays using a data sample corresponding to an integrated luminosity of 5.5fb$^{-1}$ collected with the LHCb detector. [...]
arXiv:1910.06926; LHCb-PAPER-2019-031; CERN-EP-2019-212; LHCB-PAPER-2019-031.-
2020-01-30 - 12 p.
- Published in : Phys. Rev. Lett. 124 (2020) 041801
Article from SCOAP3: PDF; Fulltext: main - PDF; 1910.06926 - PDF; Related data file(s): ZIP;
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2019-10-03
13:53 |
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2019-09-30
17:35 |
Search for the doubly charmed baryon $\Xi_{cc}^{+}$
/ LHCb Collaboration
A search for the doubly charmed baryon $\Xi_{cc}^{+}$ is performed through its decay to the $\Lambda_c^+ K^- \pi^+$ final state, using proton-proton collision data collected with the LHCb detector at centre-of-mass energies of 7, 8 and 13$\mathrm{\,Te\kern -0.1em V}$. The data correspond to a total integrated luminosity of $9\,\mathrm{fb}^{-1}$. [...]
arXiv:1909.12273; LHCb-PAPER-2019-029; CERN-EP-2019-199; LHCB-PAPER-2019-029.-
Geneva : CERN, 2019-11-19 - 15 p.
- Published in : Sci. China Phys. Mech. Astron. 63 (2020) 221062
Fulltext: PDF; Fulltext from publisher: PDF; Related data file(s): ZIP; Supplementary information: ZIP;
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