CERN Accelerating science

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1.
Positron Manipulation and Positronium Laser Excitation in AEgIS / Mariazzi, Sebastiano (OAW, Vienna) ; Caravita, Ruggero ; Aghion, Stefano ; Amsler, Claude ; Ariga, Akitaka ; Ariga, Tomoko ; Bonomi, Germano ; Bräunig, Philippe ; Bremer, Johan (CERN) ; Brusa, Roberto S et al.
Production of antihydrogen by using the charge exchange reaction, as proposed by AEgIS (Antimatter Experiment: gravity, Interferometry, Spectroscopy), requires the formation of a dense cloud of positronium atoms excited to Rydberg states. In this work, the recent advances in AEgIS towards this result are described. [...]
2017 - 6 p. - Published in : Defect and Diffusion Forum 373 (2017) 11-16
2.
Searches for Λ0b and Ξ0b decays to K0Spπ and K0SpK final states with first observation of the Λ0bK0Spπ decay / LHCb collaboration
A search for previously unobserved decays of beauty baryons to the final states K0Spπ and K0SpK is reported. The analysis is based on a data sample corresponding to an integrated luminosity of 1.0fb1 of pp collisions. [...]
arXiv:1402.0770; LHCB-PAPER-2013-061; CERN-PH-EP-2014-012; LHCB-PAPER-2013-061; CERN-PH-EP-2014-012.- Geneva : CERN, 2014 - 24 p. - Published in : JHEP 04 (2014) 087 Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP; Springer Open Access article: PDF;
3.
Measurement of the B+c meson lifetime using B+cJ/ψμ+νμX decays / LHCb collaboration
The lifetime of the B+c meson is measured using semileptonic decays having a J/ψ meson and a muon in the final state. The data, corresponding to an integrated luminosity of 2 fb1, are collected by the LHCb detector in pp collisions at a centre-of-mass energy of 8TeV. [...]
arXiv:1401.6932; CERN-PH-EP-2014-008; LHCB-PAPER-2013-063; CERN-PH-EP-2014-008; LHCB-PAPER-2013-063.- Geneva : CERN, 2014-05-01 - 28 p. - Published in : Eur. Phys. J. C 74 (2014) 2839 Article from SCOAP3: PDF; Fulltext: PDF; Fulltext from Publisher: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; Springer Open Access article: PDF;
4.
Search for Majorana neutrinos in Bπ+μμ decays / LHCb collaboration
A search for heavy Majorana neutrinos produced in the Bπ+μμ decay mode is performed using 3 fb1 of integrated luminosity collected with the LHCb detector in pp collisions at center-of-mass energies of 7 TeV and 8 TeV at the LHC. Neutrinos with masses in the range 250-5000 MeV and lifetimes from zero to 1000 ps are probed. [...]
arXiv:1401.5361; CERN-PH-EP-2014-002; LHCB-PAPER-2013-064; LHCB-PAPER-2013-064; CERN-PH-EP-2014-002.- Geneva : CERN, 2014-04-03 - 8 p. - Published in : Phys. Rev. Lett. 112 (2014) 131802 APS Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; External link: Preprint
5.
Updated measurements of exclusive J/ψ and ψ(2S) production cross-sections in pp collisions at s=7 TeV / LHCb collaboration
The differential cross-section as a function of rapidity has been measured for the exclusive production of J/ψ and ψ(2S) mesons in proton-proton collisions at s=7 TeV, using data collected by the LHCb experiment, corresponding to an integrated luminosity of 930 pb1. The cross-sections times branching fractions to two muons having pseudorapidities between 2.0 and 4.5 are measured to be σppJ/ψμ+μ(2.0<ημ±<4.5)=291±7±19 pb,σppψ(2S)μ+μ(2.0<ημ±<4.5)=6.5±0.9±0.4 pb, where the first uncertainty is statistical and the second is systematic. [...]
arXiv:1401.3288; CERN-PH-EP-2013-233; LHCB-PAPER-2013-059; CERN-PH-EP-2013-233; LHCB-PAPER-2013-059.- Geneva : CERN, 2014 - 20 p. - Published in : J. Phys. G 41 (2014) 055002 Fulltext: PDF; IOP Open Access article: PDF; Related data file(s): TAR; External link: Preprint
6.
Observation of associated production of a Z boson with a D meson in the forward region / LHCb collaboration
A search for associated production of a Z boson with an open charm meson is presented using a data sample, corresponding to an integrated luminosity of 1.0fb1 of proton--proton collisions at a centre-of-mass energy of 7 TeV, collected by the LHCb experiment. Seven candidate events for associated production of a Z boson with a D0 meson and four candidate events for a Z boson with a D+ meson are observed with a combined significance of 5.1 standard deviations. [...]
arXiv:1401.3245; CERN-PH-EP-2013-235; LHCB-PAPER-2013-062; CERN-EP-2013-235; CERN-PH-EP-2013-235; LHCB-PAPER-2013-062.- Geneva : CERN, 2014 - 17 p. - Published in : JHEP(2014)091 Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP; Springer Open Access article: PDF; Supplementary Related data file(s): ZIP; External link: Preprint
7.
Studies of beauty baryon decays to D0ph and Λ+ch final states / LHCb collaboration
Decays of beauty baryons to the D0ph and Λ+ch final states (where h indicates a pion or a kaon) are studied using a data sample of pp collisions, corresponding to an integrated luminosity of 1.0 fb1, collected by the LHCb detector. The Cabibbo-suppressed decays Λ0bD0pK and Λ0bΛ+cK are observed and their branching fractions are measured with respect to the decays Λ0bD0pπ and Λ0bΛ+cπ. [...]
arXiv:1311.4823; CERN-PH-EP-2013-207; LHCB-PAPER-2013-056; CERN-PH-EP-2013-207; LHCB-PAPER-2013-056.- Geneva : CERN, 2014-02-13 - 15 p. - Published in : Phys. Rev. D 89 (2014) 032001 APS Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; External link: Preprint
8.
Study of forward Z+jet production in pp collisions at s = 7 TeV / LHCb collaboration
A measurement of the Z(μ+μ)+jet production cross-section in pp collisions at a centre-of-mass energy s=7 TeV is presented. The analysis is based on an integrated luminosity of 1.0fb1 recorded by the LHCb experiment. [...]
arXiv:1310.8197; LHCB-PAPER-2013-058; CERN-PH-EP-2013-198; LHCB-PAPER-2013-058; CERN-PH-EP-2013-198.- Geneva : CERN, 2014-01 - 22 p. - Published in : JHEP 01 (2014) 033 Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP; Springer Open Access article: PDF; Supplementary Related data file(s): ZIP; External link: Rivet analyses reference
9.
Measurement of CP violation in the phase space of B±K+Kπ± and B±π+ππ± decays / LHCb collaboration
The charmless decays B±K+Kπ± and B±π+ππ± are reconstructed in a data set, corresponding to an integrated luminosity of 1.0 fb1 of pp collisions at a center-of-mass energy of 7 TeV, collected by LHCb in 2011. The inclusive charge asymmetries of these modes are measured to be ACP(B±K+Kπ±)=0.141±0.040(stat)±0.018(syst)±0.007(J/ψK±) and ACP(B±π+ππ±)=0.117±0.021(stat)±0.009(syst)±0.007(J/ψK±), where the third uncertainty is due to the CP asymmetry of the B±J/ψK± reference mode. [...]
arXiv:1310.4740; LHCB-PAPER-2013-051; CERN-PH-EP-2013-190; LHCB-PAPER-2013-051; CERN-PH-EP-2013-190.- Geneva : CERN, 2014-01-07 - 8 p. - Published in : Phys. Rev. Lett. 112 (2014) 011801 APS Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint
10.
Search for the rare decay D0μ+μ / LHCb collaboration
A search for the rare decay D0μ+μis performed using a data sample, corresponding to an integrated luminosity of 0.9 fb1, of pp collisions collected at a centre-of-mass energy of 7 TeV by the LHCb experiment. The observed number of events is consistent with the background expectations and corresponds to an upper limit of B(D0μ+μ)<6.2(7.6)×109 at 90% (95%) confidence level. [...]
arXiv:1305.5059; CERN-PH-EP-2013-083; LHCB-PAPER-2013-013; CERN-PH-EP-2013-083 LHCb-PAPER-2013-013; CERN-PH-EP-2013-083; LHCB-PAPER-2013-013.- 2013-08-09 - 22 p. - Published in : Phys. Lett. B 725 (2013) 15-24 APS published version, local copy: PDF; Elsevier Open Access article: PDF; Fulltext: 1305.5059 - PDF; arXiv:1305.5059 - PDF; Related data file(s): ZIP; External link: Preprint

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261 Huse, T
53 Huse, T.
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