# LHCb Papers

2017-05-22
14:16
 Updated search for long-lived particles decaying to jet pairs / LHCb Collaboration 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. [...] LHCB-PAPER-2016-065 ; CERN-EP-2017-083 ; arXiv:1705.07332 ; LHCB-PAPER-2016-065. - 2017. Fulltext - Related data file(s) - Full text

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. Fulltext - Related data file(s) - Full text

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. Fulltext - Related data file(s) - Supplementary material - Supplementary material (zip) - Full text - Fulltext

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

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. Fulltext - Previous draft version - Full text

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. Fulltext - Previous draft version - Related data file(s) - Full text

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. Fulltext - Previous draft version - Related data file(s) - Full text

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. Related data file(s) - Full text

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. Full text - Related data file(s)

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;