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LHCb Papers

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2017-05-22
14:16
Updated search for long-lived particles decaying to jet pairs
A search is presented for long-lived particles with a mass between 25 and 50 GeV/$c^2$ and a lifetime between 2 and 500 ps, using proton-proton collision data corresponding to an integrated luminosity of 2.0 fb$^{-1}$, collected by the LHCb detector at centre-of-mass energies of 7 and 8 TeV. [...]
CERN-EP-2017-083 ; LHCB-PAPER-2016-065.
- 2017.
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2017-05-18
09:34
Test of lepton universality with $B^{0} \rightarrow K^{*0}\ell^{+}\ell^{-}$ decays / LHCb Collaboration
A test of lepton universality, performed by measuring the ratio of the branching fractions of the $B^{0} \rightarrow K^{*0}\mu^{+}\mu{^-}$ and $B^{0} \rightarrow K^{*0}e^{+}e{^-}$ decays, $R_{K^{*0}}$, is presented. [...]
LHCB-PAPER-2017-013 ; CERN-EP-2017-100 ; arXiv:1705.05802 ; LHCB-PAPER-2017-013.
- 2017.
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2017-05-12
10:56
Measurement of $B^0_s$ and $D^-_s$ meson lifetimes / LHCb Collaboration
We report on a measurement of the flavor-specific $B^{0}_{s}$ lifetime and of the $D^{-}_{s}$ lifetime using proton-proton collisions at center-of-mass energies of 7 and 8 TeV, collected by the LHCb experiment and corresponding to 3.0 fb$^{-1}$ of integrated luminosity. [...]
CERN-EP-2017-070 ; LHCB-PAPER-2017-004 ; arXiv:1705.03475.
- 2017. - 16 p.
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2017-05-08
14:53
Observation of five new narrow $\Omega_c^0$ states decaying to $\Xi^+_c K^-$ / LHCb Collaboration
The $\Xi^+_c K^-$ mass spectrum is studied with a sample of $pp$ collision data corresponding to an integrated luminosity of 3.3 fb$^{-1}$, collected by the LHCb experiment. [...]
CERN-EP-2017-037 ; arXiv:1703.04639 ; LHCB-PAPER-2017-002.
- 2017.
Fulltext - 00001 Distribution of the reconstructed invariant mass $m(\Xicp \Km)$ for all candidates passing the likelihood ratio selection; the solid (red) curve shows the result of the fit, and the dashed (blue) line indicates the fitted background. The shaded (red) histogram shows the corresponding mass spectrum from the \Xicp sidebands and the shaded (light gray) distributions indicate the feed-down from partially reconstructed $\Omegares_\cquark(X)^0$ resonances. - 00002 Distribution of the reconstructed invariant mass $m(\Xicp \Km)$ for all candidates passing the likelihood ratio selection, shown as black points with error bars, and the wrong-sign $m(\Xicp \Kp)$ spectrum scaled by a factor of 0.95, shown as a solid (red) histogram. - 00000 Distribution of the reconstructed invariant mass $m(\pkpi)$ for all candidates in the inclusive \Xicp sample passing the likelihood ratio selection described in the text. The solid (red) curve shows the result of the fit, and the dashed (blue) line indicates the fitted background. - Full text - Supplementary information

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2017-05-02
11:15
Resonances and $CP$ violation in $B^{0}_{s}$ and $\overline{B}{}^{0}_{s}\to J/\psi K^{+} K^{-}$ decays in the mass region above the $\phi(1020)$ / LHCb Collaboration
The decays of $B^{0}_{s}$ and $\overline{B}{}^{0}_{s}$ mesons into the $J/\psi K^+K^-$ final state are studied in the $K^+K^-$ mass region above the $\phi(1020)$ meson in order to determine the resonant substructure and measure the $CP$-violating phase, $\phi_s$, the decay width, $\Gamma_s$, and the width difference between light and heavy mass eigenstates, $\Delta \Gamma_s$. [...]
CERN-EP-2017-062 ; LHCB-PAPER-2017-008 ; arXiv:1704.08217 ; LHCB-PAPER-2017-008.
- 2017. - 28 p.
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2017-04-27
14:36
Observation of charmless baryonic decays $B^0_{(s)} \to p \overline{p} h^+ h^{\prime-}$ / LHCb Collaboration
Decays of $B^0$ and $B_{s}^0$ mesons to the charmless baryonic final states $p \overline{p} h^+ h^{\prime-}$, where $h$ and $h^\prime$ each denote a kaon or a pion, are searched for using the LHCb detector. [...]
LHCB-PAPER-2017-005 ; CERN-EP-2017-052 ; arXiv:1704.08497 ; LHCB-PAPER-2017-005.
- 2017. - 17 p.
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2017-04-26
10:11
Observation of the decays $\Lambda_b^0 \to \chi_{c1} p K^-$ and $\Lambda_b^0 \to \chi_{c2} p K^-$ / LHCb Collaboration
The first observation of the decays $\Lambda_b^0 \to \chi_{c1} p K^-$ and $\Lambda_b^0 \to \chi_{c2} p K^-$ is reported using a data sample corresponding to an integrated luminosity of $3.0$ fb$^{-1}$, collected by the LHCb experiment in $pp$ collisions at centre-of-mass energies of 7 and 8 TeV. [...]
LHCB-PAPER-2017-011 ; CERN-EP-2017-073 ; arXiv:1704.07900 ; LHCB-PAPER-2017-011.
- 2017. - 18 p.
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2017-04-26
07:45
Observation of the $B^+ \to D^{*-}K^+\pi^+$ decay / LHCb Collaboration
The $B^+ \to D^{*-}K^+\pi^+$ decay potentially provides an excellent way to investigate charm meson spectroscopy. [...]
CERN-EP-2017-064 ; LHCB-PAPER-2017-006 ; arXiv:1704.07581.
- 2017. - 9 p.
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2017-03-30
07:23
Measurement of $B^0$, $B^0_s$, $B^+$ and $\Lambda^0_b$ production asymmetries in 7 and 8 TeV proton-proton collisions / LHCb Collaboration
The $B^0$, $B^0_s$, $B^+$ and $\Lambda^0_b$ hadron production asymmetries are measured using a data sample corresponding to an integrated luminosity of 3.0 fb$^{-1}$, collected by the LHCb experiment in proton-proton collisions at centre-of-mass energies of 7 and 8 TeV. [...]
CERN-EP-2017-036 ; LHCB-PAPER-2016-062 ; arXiv:1703.08464.
- 2017. - 40 p.
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2017-03-20
12:28
Measurement of the $B^0_s\to\mu^+\mu^-$ branching fraction and effective lifetime and search for $B^0\to\mu^+\mu^-$ decays / LHCb Collaboration
A search for the rare decays $B^0_s\to\mu^+\mu^-$ and $B^0\to\mu^+\mu^-$ is performed at the LHCb experiment using data collected in $pp$ collisions corresponding to a total integrated luminosity of 4.4 fb$^{-1}$. An excess of $B^0_s\to\mu^+\mu^-$ decays is observed with a significance of 7.8 standard deviations, representing the first observation of this decay in a single experiment. [...]
CERN-EP-2017-041; LHCB-PAPER-2017-001; arXiv:1703.05747; CERN-EP-2017-041-LHCB-PAPER-2017-001.- Geneva : CERN, 2017 - 19 p. - Published in : Phys. Rev. Lett. 118 (2017) 191801 APS Open Access Article: PDF; Fulltext: 10.1103_PhysRevLett.118.191801 - PDF; arXiv:1703.05747 - PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP;

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