CERN Accelerating science

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1.
Model-independent evidence for J/ψp contributions to Λ0bJ/ψpK decays / LHCb collaboration
The data sample of Λ0bJ/ψpK decays acquired with the LHCb detector from 7 and 8~TeV pp collisions, corresponding to an integrated luminosity of 3 fb1, is inspected for the presence of J/ψp or J/ψK contributions with minimal assumptions about Kp contributions. It is demonstrated at more than 9 standard deviations that Λ0bJ/ψpK decays cannot be described with Kp contributions alone, and that J/ψp contributions play a dominant role in this incompatibility. [...]
arXiv:1604.05708; LHCB-PAPER-2016-009; CERN-EP-2016-086; LHCB-PAPER-2016-009; CERN-EP-2016-086.- Geneva : CERN, 2016-08-18 - 9 p. - Published in : Phys. Rev. Lett. 117 (2016) 082002 APS Open Access article: PDF; Fulltext: 10.1103_PhysRevLett.117.082002 - PDF; arXiv:1604.05708 - PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; External link: Preprint
2.
Measurement of the properties of the Ξ0b baryon / LHCb Collaboration
We perform a search for near-threshold Ξ0b resonances decaying to Ξbπ+ in a sample of proton-proton collision data corresponding to an integrated luminosity of 3 fb1 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; LHCB-PAPER-2016-010; CERN-EP-2016-082.- Geneva : CERN, 2016-05-27 - 20 p. - Published in : JHEP 05 (2016) 161 Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Figures, tables and other information
3.
A precise measurement of the B0 meson oscillation frequency / LHCb collaboration
The oscillation frequency, Δmd, of B0 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 3.0fb1. A combination of the two decay modes gives Δmd=(505.0±2.1±1.0)ns1, where the first uncertainty is statistical and the second is systematic. [...]
arXiv:1604.03475; LHCB-PAPER-2015-031; CERN-EP-2016-084; LHCB-PAPER-2015-031; CERN-EP-2016-084.- Geneva : CERN, 2016-07-21 - 27 p. - Published in : Eur. Phys. J. C 76 (2016) 412 Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP; Springer Open Access article: PDF; External link: Figures, tables and other information
4.
Measurement of the mass and lifetime of the Ωb baryon / LHCb collaboration
A proton-proton collision data sample, corresponding to an integrated luminosity of 3 fb1 collected by LHCb at s=7 and 8 TeV, is used to reconstruct 63±9 ΩbΩ0cπ, Ω0cpKKπ+ decays. Using the ΞbΞ0cπ, Ξ0cpKKπ+ decay mode for calibration, the lifetime ratio and absolute lifetime of the Ωb baryon are measured to be τΩbτΞb=1.11±0.16±0.03,τΩb=1.78±0.26±0.04±0.05 ps, where the uncertainties are statistical, systematic and from the calibration mode (for τΩb only). [...]
arXiv:1604.01412; LHCB-PAPER-2016-008; CERN-EP-2016-081; CERN-EP-2016-081; LHCB-PAPER-2016-008.- Geneva : CERN, 2016-05-19 - 12 p. - Published in : Phys. Rev. D 93 (2016) 092007 Fulltext: arXiv:1604.01412 - PDF; PhysRevD.93 - PDF; 10.1103_PhysRevD.93.092007 - PDF; Related data file(s): ZIP; External link: Figures, tables and other information
5.
Model-independent measurement of the CKM angle γ using B0DK0 decays with DK0Sπ+π and K0SK+K / LHCb Collaboration
A binned Dalitz plot analysis of the decays B0DK0, with DK0Sπ+π and DK0SK+K, is performed to measure the observables x± and y±, which are related to the CKM angle γ and the hadronic parameters of the decays. The D decay strong phase variation over the Dalitz plot is taken from measurements performed at the CLEO-c experiment, making the analysis independent of the D decay model. [...]
arXiv:1604.01525; LHCB-PAPER-2016-006; CERN-EP-2016-083; LHCB-PAPER-2016-006; CERN-EP-2016-083.- Geneva : CERN, 2016-06-21 - 34 p. - Published in : JHEP 06 (2016) 131 Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; Springer Open Access article: PDF; External link: Figures, tables and other information
6.
Measurement of CP observables in B±DK± and B±Dπ± with two- and four-body D decays / LHCb collaboration
Measurements of CP observables in B±DK± and B±Dπ± decays are presented where the D meson is reconstructed in the final states K±π, π±K, K+K, π+π, K±ππ+π, π±Kπ+π and π+ππ+π. This analysis uses a sample of charged B mesons from pp collisions collected by the LHCb experiment in 2011 and 2012, corresponding to an integrated luminosity of 3.0 fb1. [...]
arXiv:1603.08993; LHCB-PAPER-2016-003; CERN-EP-2016-065; LHCB-PAPER-2016-003; CERN-EP-2016-065.- Geneva : CERN, 2016-09-10 - 15 p. - Published in : Phys. Lett. B 76 (2016) 117-131 Article from SCOAP3: PDF; Elsevier Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; External link: Figures, tables and other information
7.
Search for B+c decays to the p¯pπ+ final state / LHCb collaboration
A search for the decays of the B+c meson to p¯pπ+ is performed for the first time using a data sample corresponding to an integrated luminosity of 3.0 fb1 collected by the LHCb experiment in pp collisions at centre-of-mass energies of 7 and 8 TeV. No signal is found and an upper limit, at 95% confidence level, is set, fcfu×B(B+cp¯pπ+)<3.6×108 in the kinematic region m(p¯p)<2.85GeV/c2, pT(B)<20GeV/c and 2.0<y(B)<4.5, where B is the branching fraction and fc (fu) is the fragmentation fraction of the b quark into a B+c (B+) meson..
arXiv:1603.07037; CERN-EP-2016-072; LHCB-PAPER-2016-001; LHCB-PAPER-2016-001; CERN-EP-2016-072.- Geneva : CERN, 2016-08-10 - 9 p. - Published in : Phys. Lett. B 759 (2016) 313-321 Article from SCOAP3: PDF; Elsevier Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Figures, tables and other information
8.
Observation of Λ0bψ(2S)pK and Λ0bJ/ψπ+πpK decays and a measurement of the Λ0b baryon mass / LHCb collaboration
The decays Λ0bψ(2S)pK and Λ0bJ/ψπ+πpK are observed in a data sample corresponding to an integrated luminosity of 3fb1, collected in proton-proton collisions at 7 and 8TeV centre-of-mass energies by the LHCb detector. The ψ(2S) mesons are reconstructed through the decay modes ψ(2S)μ+μ and ψ(2S)J/ψπ+π [...]
arXiv:1603.06961; CERN-EP-2016-070; LHCB-PAPER-2015-060; CERN-EP-2016-070; LHCB-PAPER-2015-060.- Geneva : CERN, 2016-05-23 - 20 p. - Published in : JHEP 05 (2016) 132 Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; Springer Open Access article: PDF; External link: Figures, tables and other information
9.
Search for violations of Lorentz invariance and CPT symmetry in B0(s) mixing / LHCb collaboration
Violations of CPT symmetry and Lorentz invariance are searched for by studying interference effects in B0 mixing and in B0s mixing. Samples of B0J/ψK0S and B0sJ/ψK+K decays are recorded by the LHCb detector in proton--proton collisions at centre-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3 fb1. [...]
arXiv:1603.04804; CERN-EP-2016-048; LHCB-PAPER-2016-005; CERN-EP-2016-048; LHCB-PAPER-2016-005.- Geneva : CERN, 2016-06-15 - 10 p. - Published in : Phys. Rev. Lett. 116 (2016) 241601 APS Open Access article: PDF; Fulltext: arXiv:1603.04804 - PDF; 10.1103_PhysRevLett.116.241601 - PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; External link: Figures, tables and other information
10.
Observation of the Λ0bΛϕ decay / LHCb collaboration
The Λ0bΛϕ decay is observed using data corresponding to an integrated luminosity of 3.0fb1 recorded by the LHCb experiment. The decay proceeds at leading order via a bsˉss loop transition and is therefore sensitive to the possible presence of particles beyond the Standard Model. [...]
arXiv:1603.02870; LHCB-PAPER-2016-002; CERN-EP-2016-047; LHCB-PAPER-2016-002; CERN-EP-2016-047.- Geneva : CERN, 2016-08-10 - 11 p. - Published in : Phys. Lett. B 759 (2016) 282-292 Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Figures, tables and other information

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