CERN Accelerating science

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1.
Identification of charm jets at LHCb / LHCb Collaboration
The identification of charm jets is achieved at LHCb for data collected in 2015-2018 using a method based on the properties of displaced vertices reconstructed and matched with jets. The performance of this method is determined using a dijet calibration dataset recorded by the LHCb detector and selected such that the jets are unbiased in quantities used in the tagging algorithm. [...]
arXiv:2112.08435; LHCb-DP-2021-006.- 2022-02-22 - 22 p. - Published in : JINST 17 (2022) P02028 Fulltext: document - PDF; Aaij_2022_J._Inst._17_P02028 - PDF; 2112.08435 - PDF;
2.
Measurement of the photon polarization in Λ0b Λ γ decays / LHCb Collaboration
The photon polarization in bsγ transitions is measured for the first time in radiative b-baryon decays exploiting the unique spin structure of Λ0bΛγ decays. A data sample corresponding to an integrated luminosity of 6fb1 collected by the LHCb experiment in pp collisions at a center-of-mass energy of 13TeV is used. [...]
arXiv:2111.10194; LHCb-PAPER-2021-030; CERN-EP-2021-230.- 2022-03-01 - 11 p. - Published in : Phys. Rev. D 105 (2022) L051104 Fulltext: 2111.10194 - PDF; Lb2L0Gamma_Angular_Paper - PDF; Related data file(s): ZIP; Supplementary information: ZIP;
3.
Centrality determination in heavy-ion collisions with the LHCb detector / LHCb Collaboration
The centrality of heavy-ion collisions is directly related to the medium created therein. A procedure to determine the centrality of collisions with the LHCb detector is implemented for lead-lead collisions at sNN=5TeV and lead-neon fixed-target collisions at sNN=69GeV. [...]
arXiv:2111.01607; CERN-LHCb-DP-2021-002.- 2022-05-05 - 31 p. - Published in : JINST 17 (2022) P05009 Fulltext: 2111.01607 - PDF; document - PDF;
4.
Search for massive long-lived particles decaying semileptonically at s=13 TeV / LHCb Collaboration
A search is performed for massive long-lived particles (LLP) decaying semileptonically into a muon and two quarks. Two kinds of LLP production processes were considered. [...]
arXiv:2110.07293; LHCb-PAPER-2021-028; CERN-EP-2021-186; LHCB-PAPER-2021-028.- Geneva : CERN, 2022-04-28 - 31 p. - Published in : Eur. Phys. J. C 82 (2022) 373 Fulltext: 2110.07293 - PDF; document - PDF; Related data file(s): ZIP; Supplementary information: ZIP;
5.
Observation of Two New Excited Ξ0b States Decaying to Λ0bKπ+ / LHCb Collaboration
Two narrow resonant states are observed in the Λ0bKπ+ mass spectrum using a data sample of proton-proton collisions at a center-of-mass energy of 13TeV, collected by the LHCb experiment and corresponding to an integrated luminosity of 6 fb1. The minimal quark content of the Λ0bKπ+ system indicates that these are excited Ξ0b baryons. [...]
arXiv:2110.04497; LHCb-PAPER-2021-025; CERN-EP-2021-188; LHCB-PAPER-2021-025.- Geneva : CERN, 2022-04-21 - 20 p. - Published in : Phys. Rev. Lett. 128 (2022) 162001 Fulltext: PDF; Fulltext from publisher: PDF; Related data file(s): ZIP; Supplementary information: ZIP;
6.
Simultaneous determination of CKM angle γ and charm mixing parameters / LHCb Collaboration
A combination of measurements sensitive to the CP violation angle γ of the Cabibbo--Kobayashi--Maskawa unitarity triangle and to the charm mixing parameters that describe oscillations between D0 and ¯D0 mesons is performed. Results from the charm and beauty sectors, based on data collected with the LHCb detector at CERN's Large Hadron Collider, are combined for the first time. [...]
arXiv:2110.02350; LHCb-PAPER-2021-033; CERN-EP-2021-183; LHCB-PAPER-2021-033.- Geneva : CERN, 2021-12-21 - 32 p. - Published in : JHEP 2112 (2021) 141 Fulltext: document - PDF; 2110.02350 - PDF; Related data file(s): ZIP;
7.
Observation of the suppressed Λ0bDpK decay with DK+π and measurement of its CP asymmetry / LHCb Collaboration
A study of Λ0b baryon decays to the DpK final state is presented based on a proton-proton collision data sample corresponding to an integrated luminosity of 9fb1 collected with the LHCb detector. Two Λ0b decays are considered, Λ0bDpK with DKπ+ and DK+π, where D represents a superposition of D0 and ¯D0 states. [...]
arXiv:2109.02621; LHCb-PAPER-2021-027; CERN-EP-2021-179; LHCB-PAPER-2021-027.- 2021-12-01 - 14 p. - Published in : Phys. Rev. D 104 (2021) 112008 Fulltext: 2109.02621 - PDF; LHCb-PAPER-2021-027 - PDF; Fulltext from publisher: PDF; Related data file(s): ZIP;
8.
Study of Z bosons produced in association with charm in the forward region / LHCb Collaboration
The fraction of Z+jet events that contain a charm jet is measured for the first time in the forward region of proton-proton collisions. The data sample used corresponds to an integrated luminosity of 6 fb1 collected at a center-of-mass energy of 13 TeV with the LHCb detector. [...]
arXiv:2109.08084; LHCb-PAPER-2021-029; CERN-EP-2021-176; LHCB-PAPER-2021-029.- Geneva : CERN, 2022-02-24 - 24 p. - Published in : Phys. Rev. Lett. 128 (2022) 082001 Fulltext: 2109.08084 - PDF; LHCb-PAPER-2021-029 - PDF; PhysRevLett.128.082001 - PDF; Related data file(s): ZIP; Supplementary information: ZIP;
9.
Search for the doubly charmed baryon Ξ+cc in the Ξ+cππ+ final state / LHCb Collaboration
A search for the doubly charmed baryon Ξ+cc is performed in the Ξ+cππ+ invariant-mass spectrum, where the Ξ+c baryon is reconstructed in the pKπ+ final state. The study uses proton-proton collision data collected with the LHCb detector at a centre-of-mass energy of 13TeV, corresponding to a total integrated luminosity of 5.4fb1. [...]
arXiv:2109.07292; LHCb-PAPER-2021-019; CERN-EP-2021-155; LHCB-PAPER-2021-019.- Geneva : CERN, 2021-12-16 - 27 p. - Published in : JHEP 2112 (2021) 107 Fulltext: 2109.07292 - PDF; document - PDF; Fulltext from publisher: PDF; Related data file(s): ZIP; Supplementary information: ZIP;
10.
Measurement of χc1(3872) production in proton-proton collisions at s=8 and 13 TeVMeasurement of χc1(3872) production in proton-proton collisions at s = 8 and 13 TeV / LHCb Collaboration
The production cross-section of the χc1(3872) state relative to the ψ(2S) meson is measured using proton-proton collision data collected with the LHCb experiment at centre-of-mass energies of s=8 and 13 TeV, corresponding to integrated luminosities of 2.0 and 5.4 fb1, respectively. The two mesons are reconstructed in the J/ψπ+π final state. [...]
arXiv:2109.07360; LHCb-PAPER-2021-026; CERN-EP-2021-182; LHCB-PAPER-2021-026.- Geneva : CERN, 2022-01-24 - 27 p. - Published in : JHEP 01 (2022) 131 Fulltext: 2109.07360 - PDF; document - PDF; Related data file(s): ZIP;

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