LHCb Papers

2016-06-23
10:04
 Evidence for exotic hadron contributions to $\Lambda^0_b \to J/\psi p \pi^-$ decays A full amplitude analysis of $\Lambda_b^0 \to J/\psi p \pi^-$ decays is performed with a data sample acquired with the LHCb detector from 7 and 8 TeV $pp$ collisions, corresponding to an integrated luminosity of 3 fb$^{-1}$. [...] CERN-EP-2016-151 ; LHCB-PAPER-2016-015. - 2016. Fulltext - Previous draft version - Related data file(s)

2016-06-16
08:31
 Measurements of the S-wave fraction in $B^{0}\rightarrow K^{+}\pi^{-}\mu^{+}\mu^{-}$ decays and the $B^{0}\rightarrow K^{\ast}(892)^{0}\mu^{+}\mu^{-}$ differential branching fraction / LHCb collaboration A measurement of the differential branching fraction of the decay ${B^{0}\rightarrow K^{\ast}(892)^{0}\mu^{+}\mu^{-}}$ is presented together with a determination of the S-wave fraction of the $K^+\pi^-$ system in the decay $B^{0}\rightarrow K^{+}\pi^{-}\mu^{+}\mu^{-}$. [...] arXiv:1606.04731 ; CERN-EP-2016-141 ; LHCB-PAPER-2016-012. - 2016. Preprint - Full text - Related data file(s)

2016-06-01
10:16
 Measurement of the $CP$ asymmetry in $B^0_s -\overline B {^0 _s}$ mixing / LHCb Collaboration The $CP$ asymmetry in the mixing of $B_s^0$ and $\overline{B}{}_s^0$ mesons is measured in proton-proton collision data corresponding to an integrated luminosity of 3.0 fb$^{-1}$, recorded by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. [...] arXiv:1605.09768 ; LHCB-PAPER-2016-013 ; CERN-EP-2016-133. - 2016. - 17 p. Related data file(s) - Preprint - Full text - Related supplementary data file(s)

2016-05-06
08:25
 Measurement of the CKM angle $\gamma$ using $B^0 \rightarrow D K^{*0}$ with $D \rightarrow K^0_S \pi^+ \pi^-$ decays / LHCb collaboration A model-dependent amplitude analysis of the decay $B^0\rightarrow D(K^0_S\pi^+\pi^-) K^{*0}$ is performed using proton-proton collision data corresponding to an integrated luminosity of 3.0fb$^{-1}$, recorded at $\sqrt{s}=7$ and $8 TeV$ by the LHCb experiment. [...] arXiv:1605.01082 ; LHCB-PAPER-2016-007 ; CERN-EP-2016-089. - 2016. - 32 p. Preprint - Full text - Related data file(s)

2016-05-04
08:04
 Measurement of forward $W$ and $Z$ boson production in association with jets in proton-proton collisions at $\sqrt{s}=8$ TeV / LHCb collaboration The production of $W$ and $Z$ bosons in association with jets is studied in the forward region of proton-proton collisions collected at a centre-of-mass energy of 8~TeV by the LHCb experiment, corresponding to an integrated luminosity of 1.98 $\pm$ 0.02 fb$^{-1}$. The $W$ boson is identified using its decay to a muon and a neutrino, while the $Z$ boson is identified through its decay to a muon pair. [...] arXiv:1605.00951; CERN-EP-2016-092; LHCB-PAPER-2016-011.- Geneva : CERN, 2016 - 27 p. - Published in : J. High Energy Phys. 05 (2016) 131 Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; Springer Open Access article: PDF; External link: Preprint

2016-04-21
08:37
 Model-independent evidence for $J/\psi p$ contributions to $\Lambda_b^0\to J/\psi p K^-$ decays / LHCb collaboration The data sample of $\Lambda_b^0\to J/\psi p K^-$ decays acquired with the LHCb detector from 7 and 8~TeV $pp$ collisions, corresponding to an integrated luminosity of 3 fb$^{-1}$, is inspected for the presence of $J/\psi p$ or $J/\psi K^-$ contributions with minimal assumptions about $K^- p$ contributions. [...] arXiv:1604.05708 ; LHCB-PAPER-2016-009 ; CERN-EP-2016-086. - 2016. - 21 p. Preprint - Full text - Related data file(s) - Related supplementary data file(s)

2016-04-14
09:52
 Measurement of the properties of the $\Xi_b^{*0}$ baryon / LHCb Collaboration We perform a search for near-threshold $\Xi_b^0$ resonances decaying to $\Xi_b^- \pi^+$ in a sample of proton-proton collision data corresponding to an integrated luminosity of 3 fb$^{-1}$ collected by the LHCb experiment. We observe one resonant state, with the following properties: \begin{eqnarray*} m(\Xi_b^{*0}) - m(\Xi_b^-) - m(\pi^+) &=& 15.727 \pm 0.068 \, (\mathrm{stat}) \pm 0.023 \, (\mathrm{syst}) \, \mathrm{MeV}/c^2, \\ \Gamma(\Xi_b^{*0}) &=& 0.90 \pm 0.16 \, (\mathrm{stat}) \pm 0.08 \, (\mathrm{syst}) \, \mathrm{MeV} [...] arXiv:1604.03896; LHCB-PAPER-2016-010; CERN-EP-2016-082.- Geneva : CERN, 2016 - 18 p. - Published in : J. High Energy Phys. 05 (2016) 161 Fulltext: PDF; Related data file(s): ZIP; Springer Open Access article: PDF; External link: Preprint

2016-04-13
08:26
 A precise measurement of the $B^0$ meson oscillation frequency / LHCb collaboration The oscillation frequency, $\Delta m_d$, of $B^0$ mesons is measured using semileptonic decays with a $D^-$ or $D^{*-}$ meson in the final state, in a data sample of $pp$ collisions collected by the LHCb detector corresponding to an integrated luminosity of 3.0$\mbox{fb}^{-1}$. [...] arXiv:1604.03475 ; LHCB-PAPER-2015-031 ; CERN-EP-2016-084. - 2016. - 27 p. Preprint - Full text - Related data file(s)

2016-04-07
08:52
 Measurement of the mass and lifetime of the $\Omega_b^-$ baryon / LHCb collaboration A proton-proton collision data sample, corresponding to an integrated luminosity of 3 fb$^{-1}$ collected by LHCb at $\sqrt{s}=7$ and 8 TeV, is used to reconstruct $63\pm9$ $\Omega_b^-\to\Omega_c^0\pi^-$, $\Omega_c^0\to pK^-K^-\pi^+$ decays. Using the $\Xi_b^-\to\Xi_c^0\pi^-$, $\Xi_c^0\to pK^-K^-\pi^+$ decay mode for calibration, the lifetime ratio and absolute lifetime of the $\Omega_b^-$ baryon are measured to be \begin{align*} \frac{\tau_{\Omega_b^-}}{\tau_{\Xi_b^-}} &= 1.11\pm0.16\pm0.03, \\ \tau_{\Omega_b^-} &= 1.78\pm0.26\pm0.04\pm0.05~{\rm ps}, \end{align*} where the uncertainties are statistical, systematic and from the calibration mode (for $\tau_{\Omega_b^-}$ only). [...] arXiv:1604.01412; CERN-EP-2016-081; LHCB-PAPER-2016-008.- Geneva : CERN, 2016 - 21 p. - Published in : Phys. Rev. D 93 (2016) 092007 APS Open Access article: PD; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint

2016-04-06
15:07
 Model-independent measurement of the CKM angle $\gamma$ using $B^0 \to D K^{\ast 0}$ decays with $D \to K_{S}^{0} \pi^{+} \pi^{-}$ and $K_{S}^{0} K^{+} K^{-}$ / LHCb Collaboration A binned Dalitz plot analysis of the decays $B^0 \to D K^{\ast 0}$, with $D \to K_{S}^{0} \pi^{+} \pi^{-}$ and $D \to K_{S}^{0} K^{+} K^{-}$, is performed to measure the observables $x_\pm$ and $y_\pm$, which are related to the CKM angle $\gamma$ and the hadronic parameters of the decays. [...] arXiv:1604.01525 ; LHCB-PAPER-2016-006 ; CERN-EP-2016-083. - 2016. - 34 p. Related data file(s) - Preprint - Full text - Related supplementary data file(s)