CERN Accelerating science

CERN Document Server Sök i 335 journaler efter:  1 - 10nästaslut  gå till journal: Sökningen tog 1.25 sekunder. 
1.
Search for CP violation in Ξ+cpKπ+ decays using model-independent techniques / LHCb Collaboration
A first search for CP violation in the Cabibbo-suppressed Ξ+cpKπ+ decay is performed using both a binned and an unbinned model-independent technique in the Dalitz plot. The studies are based on a sample of proton-proton collision data, corresponding to an integrated luminosity of 3.0 fb1, and collected by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. [...]
arXiv:2006.03145; CERN-EP-2020-069; LHCb-PAPER-2019-026; LHCB-PAPER-2019-026.- Geneva : CERN, 2020-10-26 - 16 p. - Published in : Eur. Phys. J. C 80 (2020) 986 Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP;
2.
Determination of quantum numbers for several excited charmed mesons observed in BD+ππ decays / LHCb Collaboration
A four-body amplitude analysis of the BD+ππ decay is performed, where fractions and relative phases of the various resonances contributing to the decay are measured. Several quasi-model-independent analyses are performed aimed at searching for the presence of new states and establishing the quantum numbers of previously observed charmed meson resonances. [...]
arXiv:1911.05957; CERN-EP-2019-201; LHCb-PAPER-2019-027; LHCB-PAPER-2019-027.- Geneva : CERN, 2020-02-21 - 24 p. - Published in : Phys. Rev. D 101 (2020) 032005 Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP;
3.
Measurement of the ηc(1S) production cross-section in pp collisions at s=13 TeV / LHCb Collaboration
Using a data sample corresponding to an integrated luminosity of 2.0fb1, collected by the LHCb experiment, the production of the ηc(1S) state in proton-proton collisions at a centre-of-mass energy of s=13 TeV is studied in the rapidity range 2.0<y<4.5 and in the transverse momentum range 6.5<pT<14.0 GeV. The cross-section for prompt production of ηc(1S) mesons relative to that of the J/ψ meson is measured using the pˉp decay mode and is found to be σηc(1S)/σJ/ψ=1.69±0.15±0.10±0.18. [...]
arXiv:1911.03326; LHCb-PAPER-2019-024; CERN-EP-2019-214; LHCB-PAPER-2019-024.- 2020-03-02 - 29 p. - Published in : Eur. Phys. J. C 80 (2020) 191 Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP; Supplementary information: ZIP;
4.
Amplitude analysis of the B+π+π+π decay / LHCb Collaboration
The results of an amplitude analysis of the charmless three-body decay B+π+π+π, in which CP-violation effects are taken into account, are reported. The analysis is based on a data sample corresponding to an integrated luminosity of 3fb1 of pp collisions recorded with the LHCb detector. [...]
arXiv:1909.05212; LHCb-PAPER-2019-017; CERN-EP-2019-157; LHCB-PAPER-2019-017.- Geneva : CERN, 2020-01-21 - 46 p. - Published in : Phys. Rev. D 101 (2020) 012006 Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP; Supplementary information: ZIP;
5.
Observation of several sources of CP violation in B+π+π+π decays / LHCb Collaboration
Observations are reported of different sources of CP violation from an amplitude analysis of B+π+π+π decays, based on a data sample corresponding to an integrated luminosity of 3fb1 of pp collisions recorded with the LHCb detector. A large CP asymmetry is observed in the decay amplitude involving the tensor f2(1270) resonance, and in addition significant CP violation is found in the π+π S-wave at low invariant mass. [...]
arXiv:1909.05211; LHCb-PAPER-2019-018; CERN-EP-2019-156; LHCB-PAPER-2019-018.- 2020-01-21 - 11 p. - Published in : Phys. Rev. Lett. 124 (2020) 031801 Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP;
6.
Measurement of the electron reconstruction efficiency at LHCb / LHCb Collaboration
The single electron track-reconstruction efficiency is determined using a sample corresponding to 1.3 fb1of pp collision data recorded with the LHCb detector in 2017. This measurement exploits B+J/ψ(e+e)K+ decays, where one of the electrons is fully reconstructed and paired with the kaon, while the other electron is reconstructed using only the information of the vertex detector. [...]
arXiv:1909.02957; LHCb-DP-2019-003; CERN-EP-2019-181.- 2019 - 21 p. - Published in : JINST 14 (2019) P11023 Fulltext: PDF; Fulltext from publisher: Aaij_2019_J._Inst._14_P11023 (1) - PDF; Aaij_2019_J._Inst._14_P11023 - PDF;
7.
Search for the lepton-flavour violating decays B+K+μ±e / LHCb Collaboration
A search for the lepton-flavour violating decays B+K+μ±e is performed using a sample of proton-proton collision data, collected with the LHCb experiment at centre-of-mass energies of 7 and 8 TeV and corresponding to an integrated luminosity of 3 fb1. No significant signal is observed, and upper limits on the branching fractions are set as B(B+K+μe+)<7.0 (9.5)×109 and B(B+K+μ+e)<6.4 (8.8)×109 at 90 (95) % confidence level. [...]
arXiv:1909.01010; CERN-EP-2019-172; LHCb-PAPER-2019-022.- 2019-12-12 - 11 p. - Published in : Phys. Rev. Lett. 123 (2019) 241802 Article from SCOAP3: PDF; Fulltext: PDF;
8.
Measurement of ψ(2S) production cross-sections in proton-proton collisions at s=7 and 13 TeV / LHCb Collaboration
The cross-sections of ψ(2S) meson production in proton-proton collisions at s=13 TeV are measured with a data sample collected by the LHCb detector corresponding to an integrated luminosity of 275 pb1. The production cross-sections for prompt ψ(2S) mesons and those for ψ(2S) mesons from b-hadron decays (ψ(2S)fromb) are determined as functions of the transverse momentum, pT, and the rapidity, y, of the ψ(2S) meson in the kinematic range 2<pT<20 GeV/c and 2.0<y<4.5. [...]
arXiv:1908.03099; CERN-EP-2019-150; LHCb-PAPER-2018-049.- Geneva : CERN, 2020-02-28 - 23 p. - Published in : Eur. Phys. J. C 80 (2020) 185 Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP;
9.
Observation of new resonances in the Λ0bπ+π system / LHCb Collaboration
We report the observation of a new structure in the Λ0bπ+π spectrum using the full LHCb data set of pp collisions, corresponding to an integrated luminosity of 9fb1, collected at s=7, 8 and 13TeV. A study of the structure suggests its interpretation as a superposition of two almost degenerate narrow states. [...]
arXiv:1907.13598; LHCb-PAPER-2019-025 CERN-EP-2019-153; LHCb-PAPER-2019-025; CERN-EP-2019-153.- 2019-10-12 - 11 p. - Published in : Phys. Rev. Lett. 123 (2019) 152001 Article from SCOAP3: PDF; Fulltext: PDF;
10.
Measurement of CP violation in the B0sϕϕ decay and search for the B0ϕϕ decay / LHCb Collaboration
A measurement of the time-dependent CP-violating asymmetry in B0sϕϕ decays is presented. Using a sample of proton-proton collision data corresponding to an integrated luminosity of 5.0fb1 collected by the LHCb experiment at centre-of-mass energies s=7 TeV in 2011, 8 TeV in 2012 and 13 TeV in 2015 and 2016, a signal yield of around 9000 B0sϕϕ decays is obtained. [...]
arXiv:1907.10003; LHCb-PAPER-2019-019; CERN-EP-2019-121; LHCB-PAPER-2019-019.- Geneva : CERN, 2019-12-23 - 34 p. - Published in : JHEP 12 (2019) 155 Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP;

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