CERN Accelerating science

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1.
Search for Darkonium in e+ee+e Collisions / BABAR Collaboration
Collider searches for dark sectors, new particles interacting only feebly with ordinary matter, have largely focused on identifying signatures of new mediators, leaving much of dark sector structures unexplored. In particular, the existence of dark matter bound states (darkonia) remains to be investigated. [...]
arXiv:2106.08529; BABAR-PUB-21/002; SLAC-PUB-17608.- 2022-01-11 - 10 p. - Published in : Phys. Rev. Lett. 128 (2022) 021802 Fulltext: PDF;
2.
Search for CPCP violation in Ξ+cpKπ+Ξ+cpKπ+ decays using model-independent techniques / LHCb Collaboration
A first search for CPCP violation in the Cabibbo-suppressed Ξ+cpKπ+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 fb13.0 fb1, and collected by the LHCb experiment at centre-of-mass energies of 77 and 8 TeV8 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;
3.
Determination of quantum numbers for several excited charmed mesons observed in BD+ππBD+ππ decays / LHCb Collaboration
A four-body amplitude analysis of the BD+ππBD+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;
4.
Measurement of the ηc(1S)ηc(1S) production cross-section in pppp collisions at s=13s=13 TeV / LHCb Collaboration
Using a data sample corresponding to an integrated luminosity of 2.0fb12.0fb1, collected by the LHCb experiment, the production of the ηc(1S)ηc(1S) state in proton-proton collisions at a centre-of-mass energy of s=13 TeVs=13 TeV is studied in the rapidity range 2.0<y<4.52.0<y<4.5 and in the transverse momentum range 6.5<pT<14.0 GeV6.5<pT<14.0 GeV. The cross-section for prompt production of ηc(1S)ηc(1S) mesons relative to that of the J/ψJ/ψ meson is measured using the pˉpp¯p decay mode and is found to be σηc(1S)/σJ/ψ=1.69±0.15±0.10±0.18σηc(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;
5.
Amplitude analysis of the B+π+π+πB+π+π+π decay / LHCb Collaboration
The results of an amplitude analysis of the charmless three-body decay B+π+π+πB+π+π+π, in which CPCP-violation effects are taken into account, are reported. The analysis is based on a data sample corresponding to an integrated luminosity of 3fb13fb1 of pppp 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;
6.
Observation of several sources of CPCP violation in B+π+π+πB+π+π+π decays / LHCb Collaboration
Observations are reported of different sources of CPCP violation from an amplitude analysis of B+π+π+πB+π+π+π decays, based on a data sample corresponding to an integrated luminosity of 3fb13fb1 of pppp collisions recorded with the LHCb detector. A large CPCP asymmetry is observed in the decay amplitude involving the tensor f2(1270)f2(1270) resonance, and in addition significant CPCP violation is found in the π+ππ+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;
7.
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 fb11.3 fb1of pppp collision data recorded with the LHCb detector in 2017. This measurement exploits B+J/ψ(e+e)K+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;
8.
Search for the lepton-flavour violating decays B+K+μ±eB+K+μ±e / LHCb Collaboration
A search for the lepton-flavour violating decays B+K+μ±eB+K+μ±e is performed using a sample of proton-proton collision data, collected with the LHCb experiment at centre-of-mass energies of 77 and 8 TeV8 TeV and corresponding to an integrated luminosity of 3 fb1 fb1. No significant signal is observed, and upper limits on the branching fractions are set as B(B+K+μe+)<7.0 (9.5)×109B(B+K+μe+)<7.0 (9.5)×109 and B(B+K+μ+e)<6.4 (8.8)×109B(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;
9.
Measurement of ψ(2S)ψ(2S) production cross-sections in proton-proton collisions at s=7s=7 and 13 TeV / LHCb Collaboration
The cross-sections of ψ(2S)ψ(2S) meson production in proton-proton collisions at s=13 TeVs=13 TeV are measured with a data sample collected by the LHCb detector corresponding to an integrated luminosity of 275 pb1275 pb1. The production cross-sections for prompt ψ(2S)ψ(2S) mesons and those for ψ(2S)ψ(2S) mesons from bb-hadron decays (ψ(2S)frombψ(2S)fromb) are determined as functions of the transverse momentum, pTpT, and the rapidity, yy, of the ψ(2S)ψ(2S) meson in the kinematic range 2<pT<20 GeV/c2<pT<20 GeV/c and 2.0<y<4.52.0<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;
10.
Observation of new resonances in the Λ0bπ+πΛ0bπ+π system / LHCb Collaboration
We report the observation of a new structure in the Λ0bπ+πΛ0bπ+π spectrum using the full LHCb data set of pppp collisions, corresponding to an integrated luminosity of 9fb19fb1, collected at s=7s=7, 8 and 13TeV13TeV. 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;

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