CERN Accelerating science

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1.
Model-independent confirmation of the Z(4430) state / LHCb collaboration
The decay B0ψ(2S)K+π is analyzed using 3 fb1 of pp collision data collected with the LHCb detector. A model-independent description of the ψ(2S)π mass spectrum is obtained, using as input the Kπ mass spectrum and angular distribution derived directly from data, without requiring a theoretical description of resonance shapes or their interference. [...]
arXiv:1510.01951; CERN-PH-EP-2015-244; LHCB-PAPER-2015-038; CERN-PH-EP-2015-244; LHCB-PAPER-2015-038.- 2015-12-29 - 15 p. - Published in : Phys. Rev. D 92 (2015) 112009 APS Open Access article: PDF; Fulltext: 10.1103_PhysRevD.92.112009 - PDF; arXiv:1510.01951 - PDF; External link: Figures, tables and other information
2.
LHCb Detector Performance / LHCb collaboration
The LHCb detector is a forward spectrometer at the Large Hadron Collider (LHC) at CERN. The experiment is designed for precision measurements of CP violation and rare decays of beauty and charm hadrons. [...]
arXiv:1412.6352; LHCB-DP-2014-002; CERN-PH-EP-2014-290; CERN-PH-EP-2014-290; LHCB-DP-2014-002.- Geneva : CERN, 2015-03-05 - 73 p. - Published in : Int. J. Mod. Phys. A 30 (2015) 1530022 Fulltext: PDF; World Scientific Open Access article: PDF; External link: Preprint
3.
Measurement of the inelastic pp cross-section at a centre-of-mass energy of s=7 TeV / LHCb Collaboration
The cross-section for inelastic proton-proton collisions, with at least one prompt long-lived charged particle of transverse momentum pT>0.2 GeV/c in the pseudorapidity range 2.0<η<4.5, is measured by the LHCb experiment at a centre-of-mass energy of s=7 TeV. The cross-section in this kinematic range is determined to be σaccinel=55.0±2.4 mb within the spectrometer acceptance with an experimental uncertainty that is dominated by systematic contributions. [...]
arXiv:1412.2500; CERN-PH-EP-2014-285; LHCB-PAPER-2014-057; LHCB-PAPER-2014-057; CERN-PH-EP-2014-285.- Geneva : CERN, 2015-02-19 - 15 p. - Published in : JHEP 02 (2015) 129 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: Rivet analyses reference
4.
Measurement of the lifetime of the B+c meson using the B+cJ/ψπ+ decay mode / LHCb collaboration
The difference in total widths between the B+c and B+ mesons is measured using 3.0fb1 of data collected by the LHCb experiment in 7 and 8 TeV centre-of-mass energy proton-proton collisions at the LHC. Through the study of the time evolution of B+cJ/ψπ+ and B+J/ψK+ decays, the width difference is measured to be ΔΓΓB+cΓB+=4.46±0.14±0.07mm1c, where the first uncertainty is statistical and the second systematic. [...]
arXiv:1411.6899; CERN-PH-EP-2014-283; LHCB-PAPER-2014-060; CERN-PH-EP-2014-283; LHCB-PAPER-2014-060.- Geneva : CERN, 2015-03-06 - 9 p. - Published in : Phys. Lett. B 742 (2015) 29-37 Article from SCOAP3: PDF; Elsevier Open Access article : PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint
5.
Observation of two new Ξb baryon resonances / LHCb collaboration
Two structures are observed close to the kinematic threshold in the Ξ0bπ mass spectrum in a sample of proton-proton collision data, corresponding to an integrated luminosity of 3.0 fb1 recorded by the LHCb experiment. In the quark model, two baryonic resonances with quark content bds are expected in this mass region: the spin-parity JP=12+ and JP=32+ states, denoted Ξb and Ξb. [...]
arXiv:1411.4849; CERN-PH-EP-2014-279; LHCB-PAPER-2014-061; CERN-PH-EP-2014-279; LHCB-PAPER-2014-061.- Geneva : CERN, 2015-02-10 - 9 p. - Published in : Phys. Rev. Lett. 114 (2015) 062004 APS Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; External links: Interactions.org article; LHCb website article; Press Release; Symmetry Magazine article
6.
Observation of the rare B0sμ+μ decay from the combined analysis of CMS and LHCb data / CMS and LHCb Collaborations
A joint measurement is presented of the branching fractions B0sμ+μ and B0μ+μ in proton-proton collisions at the LHC by the CMS and LHCb experiments. The data samples were collected in 2011 at a centre-of-mass energy of 7 TeV, and in 2012 at 8 TeV. [...]
arXiv:1411.4413; CERN-PH-EP-2014-220; CMS-BPH-13-007; LHCB-PAPER-2014-049; CERN-PH-EP-2014-220; CMS-BPH-13-007; LHCB-PAPER-2014-049.- 2015-05-13 - 46 p. - Published in : Nature 522 (2015) 68-72 Fulltext: openaccess_nature14474 - PDF; arXiv:1411.4413 - PDF; Fulltext from Publisher: nature14474 - PDF; 10.1038_nature14474 - PDF; Related data file(s): ZIP; External links: Interactions.org article; Fermilab News article; Los Angeles Times article
7.
Precision measurement of CP violation in B0sJ/ψK+K decays / LHCb Collaboration
The time-dependent CP asymmetry in B0sJ/ψK+K decays is measured using pp collision data, corresponding to an integrated luminosity of 3.0fb1, collected with the LHCb detector at centre-of-mass energies of 7 and 8TeV. In a sample of 96 000 B0sJ/ψK+K decays, the CP-violating phase ϕs is measured, as well as the decay widths ΓL and ΓH of the light and heavy mass eigenstates of the B0sˉB0s system. [...]
arXiv:1411.3104; LHCB-PAPER-2014-059; CERN-PH-EP-2014-271; LHCB-PAPER-2014-059; CERN-PH-EP-2014-271.- Geneva : CERN, 2015-01-30 - 9 p. - Published in : Phys. Rev. Lett. 114 (2015) 041801 APS Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; External link: Preprint
8.
Measurement of B+c production in proton-proton collisions at s=8 TeV / LHCb Collaboration
Production of B+c mesons in proton-proton collisions at a center-of-mass energy of 8 TeV is studied with data corresponding to an integrated luminosity of 2.0 fb1 recorded by the LHCb experiment. The ratio of production cross-sections times branching fractions between the B+cJ/ψπ+ and B+J/ψK+ decays is measured as a function of transverse momentum and rapidity in the regions 0<pT<20GeV/c and 2.0<y<4.5. [...]
arXiv:1411.2943; CERN-PH-EP-2014-269; LHCB-PAPER-2014-050; LHCB-PAPER-2014-050; CERN-PH-EP-2014-269.- Geneva : CERN, 2015-04-02 - 9 p. - Published in : Phys. Rev. Lett. 114 (2015) 132001 APS Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; Related supplementary data files(s): ZIP; External link: Preprint
9.
Measurement of the CP-violating phase β in B0J/ψπ+π decays and limits on penguin effects / LHCb Collaboration
Time-dependent CP violation is measured in the B0J/ψπ+π channel for each π+π resonant final state using data collected with an integrated luminosity of 3.0 fb1 in pp collisions using the LHCb detector. The final state with the largest rate, J/ψρ0(770), is used to measure the CP-violating angle 2βeff to be (41.7±9.6+2.86.3). [...]
arXiv:1411.1634; CERN-PH-EP-2014-268; LHCB-PAPER-2014-058; LHCB-PAPER-2014-058; CERN-PH-EP-2014-268.- Geneva : CERN, 2015-03-06 - 12 p. - Published in : Phys. Lett. B 742 (2015) 38-49 Article from SCOAP3: PDF; Elsevier Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; External link: Preprint
10.
Study of ηη mixing from measurement of B0(s)J/ψη() decay rates / LHCb Collaboration
A study of B0and B0s meson decays into J/ψη and J/ψη final states is performed using a data set of proton-proton collisions at centre-of-mass energies of 7 and 8TeV, collected by the LHCb experiment and corresponding to 3.0fb1 of integrated luminosity. The decay B0J/ψη is observed for the first time. [...]
arXiv:1411.0943; CERN-PH-EP-2014-266; LHCB-PAPER-2014-056; LHCB-PAPER-2014-056; CERN-PH-EP-2014-266.- Geneva : CERN, 2015-01-08 - 26 p. - Published in : JHEP 01 (2015) 024 Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF; Related data file(s): ZIP; Springer Open Access article: PDF;

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