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2024-10-04
10:45
Measurement of the effective leptonic weak mixing angle / LHCb Collaboration
Using pppp collision data at s=13s=13~TeV, recorded by the LHCb experiment between 2016 and 2018 and corresponding to an integrated luminosity of 5.45.4~fb11, the forward-backward asymmetry in the ppZ/γμ+μppZ/γμ+μ process is measured. The measurement is carried out in ten intervals of the difference between the muon pseudorapidities, within a fiducial region covering dimuon masses between 6666 and 116116 GeV, muon pseudorapidities between 2.02.0 and 4.54.5 and muon transverse momenta above 2020 GeV. [...]
arXiv:2410.02502; LHCb-PAPER-2024-028; CERN-EP-2024-230.- Geneva : CERN, 2024-12-03 - 28 p. - Published in : JHEP 2412 (2024) 026 Fulltext: 2410.02502 - PDF; document - PDF; Related data file(s): ZIP; Supplementary information: LHCb-PAPER-2024-028-supplementary - ZIP; supplementary (3) - PDF;

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2024-09-27
11:23
Search for B0(s)μ+μB0(s)μ+μ in B+cπ+μ+μB+cπ+μ+μ decays / LHCb Collaboration
A search for the very rare B0μ+μB0μ+μ and B0sμ+μB0sμ+μ decays is conducted by analysing the B+cπ+μ+μB+cπ+μ+μ process. The analysis uses proton-proton collision data collected with the LHCb detector between 2011 and 2018, corresponding to an integrated luminosity of 9 fb1fb1 [...]
arXiv:2409.17209; CERN-EP-2024-220; LHCb-PAPER-2024-026.- Geneva : CERN, 2025-01-13 - 16 p. - Published in : Eur. Phys. J. C 85 (2025) 20 Figures: ZIP; Fulltext: 2409.17209 - PDF; document - PDF;

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2024-09-20
11:34
Analysis of Λ0bpKμ+μΛ0bpKμ+μ decays / LHCb Collaboration
The differential branching fraction and angular coefficients of Λ0bpKμ+μΛ0bpKμ+μ decays are measured in bins of the dimuon mass squared and dihadron mass. The analysis is performed using a data set corresponding to 9fb1fb1 of integrated luminosity collected with the LHCbLHCb detector between 2011 and 2018. [...]
arXiv:2409.12629; CERN-EP-2024-212; LHCb-PAPER-2024-024.- Geneva : CERN, 2024-12-19 - 33 p. - Published in : JHEP 2412 (2024) 147 Fulltext: 2409.12629 - PDF; document - PDF; Related data file(s): ZIP; Supplementary information: ZIP;

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2024-09-06
14:06
Measurement of CPCP violation in B0D+DB0D+D and B0sD+sDsB0sD+sDs decaysMeasurement of CP violation in B00→ D++D and B0sB0sD+sDsD+sDs decays / LHCb Collaboration
A time-dependent, flavour-tagged measurement of CPCP violation is performed with B0D+DB0D+D and B0sD+sDsB0sD+sDs decays, using data collected by the LHCb detector in proton-proton collisions at a centre-of-mass energy of 13 TeV corresponding to an integrated luminosity of 6 fb11. In B0D+DB0D+D decays the CPCP-violation parameters are measured to be \begin{align} S_{D^{+}D^{-}} & = -0.552 \pm 0.100\text{(stat)} \pm 0.010\text{(syst)}, \nonumber \newline C_{D^{+}D^{-}} & = \phantom{-}0.128 \pm0.103\text{(stat)} \pm 0.010\text{(syst)}. [...]
arXiv:2409.03009; LHCb-PAPER-2024-027; CERN-EP-2024-217; LHCB-PAPER-2024-027.- Geneva : CERN, 2025-01-09 - 26 p. - Published in : JHEP 2501 (2025) 061 Fulltext: 2409.03009 - PDF; document - PDF; Related data file(s): ZIP;

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2024-09-06
12:25
Measurement of Λ0bΛ0b, Λ+cΛ+c and ΛΛ decay parameters using Λ0bΛ+chΛ0bΛ+ch decays / LHCb Collaboration
A comprehensive study of the angular distributions in the bottom-baryon decays Λ0bΛ+ch(h=π,K)Λ0bΛ+ch(h=π,K), followed by Λ+cΛh+Λ+cΛh+ with ΛpπΛpπ or Λ+cpK0SΛ+cpK0S decays, is performed using a data sample of proton-proton collisions corresponding to an integrated luminosity of 9 fb1fb1 collected by the LHCb experiment at center-of-mass energies of 7, 8 and 13 TeVTeV. The decay parameters and the associated charge-parity (CPCP) asymmetries are measured, with no significant CPCP violation observed. [...]
arXiv:2409.02759; LHCb-PAPER-2024-017; CERN-EP-2024-200.- Geneva : CERN, 2024-12-30 - 15 p. - Published in : Phys. Rev. Lett. 133 (2024) 261804 Fulltext: 2409.02759 - PDF; Publication - PDF; Related data file(s): ZIP;

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2024-09-06
09:49
Measurement of CPCP violation observables in D+KK+π+D+KK+π+ decays / LHCb Collaboration
A search for violation of the charge-parity (CPCP) symmetry in the D+KK+π+D+KK+π+ decay is presented, with proton-proton collision data corresponding to an integrated luminosity of 5.4 fb11, collected at a center-of-mass energy of 13 TeV with the LHCb detector. A novel model-independent technique is used to compare the D+D+ and DD phase-space distributions, with instrumental asymmetries subtracted using the D+sKK+π+D+sKK+π+ decay as a control channel. [...]
arXiv:2409.01414; CERN-EP-2024-204; LHCb-PAPER-2024-019.- Geneva : CERN, 2024-12-16 - 13 p. - Published in : Phys. Rev. Lett. 133 (2024) 251801 Fulltext: 2409.01414 - PDF; Publication - PDF; Related data file(s): ZIP;

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2024-08-30
08:53
Study of the rare decay J/ψμ+μμ+μJ/ψμ+μμ+μ / LHCb Collaboration
The rare electromagnetic J/ψμ+μμ+μJ/ψμ+μμ+μ decay is observed with a significance greatly exceeding the discovery threshold, using proton-proton collision data collected by the LHCb experiment during 2016--2018 at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.4fb15.4fb1. The rate of this decay is measured relative to that of the J/ψμ+μJ/ψμ+μ mode. [...]
arXiv:2408.16646; LHCb-PAPER-2024-016; CERN-EP-2024-201; LHCB-PAPER-2024-016.- Geneva : CERN, 2024-12-10 - 26 p. - Published in : JHEP 2412 (2024) 062 Fulltext: 2408.16646 - PDF; document - PDF; Related data file(s): ZIP;

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2024-08-12
13:51
Observation of muonic Dalitz decays of χbχb mesons and precise spectroscopy of hidden-beauty states / LHCb Collaboration
The decays of the χb1(1P)χb1(1P), χb2(1P)χb2(1P), χb1(2P)χb1(2P) and χb2(2P)χb2(2P) mesons into the Υ(1S)μ+μΥ(1S)μ+μ final state are observed with a high significance using proton-proton collision data collected with the LHCb detector and corresponding to an integrated luminosity of 9fb11. The newly observed decays together with the Υ(2S)Υ(1S)π+πΥ(2S)Υ(1S)π+π and Υ(3S)Υ(2S)π+πΥ(3S)Υ(2S)π+π decay modes are used for precision measurements of the mass and mass splittings for the hidden-beauty states..
arXiv:2408.05134; LHCb-PAPER-2024-025; CERN-EP-2024-207.- Geneva : CERN, 2024-10-16 - 29 p. - Published in : JHEP 2410 (2024) 122 Fulltext: 2408.05134 - PDF; Publication - PDF; Related data file(s): ZIP;

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2024-07-26
15:46
Measurement of <math display="inline"><mrow><msup><mrow><mi>D</mi></mrow><mrow><mn>0</mn></mrow></msup><mo>-</mo><msup><mrow><mover accent="true"><mrow><mi>D</mi></mrow><mrow><mo stretchy="false">¯</mo></mrow></mover></mrow><mrow><mn>0</mn></mrow></msup></mrow></math> mixing and search for <math display="inline"><mi>C</mi><mi>P</mi></math> violation with <math display="inline"><mrow><msup><mrow><mi>D</mi></mrow><mrow><mn>0</mn></mrow></msup><mo stretchy="false">→</mo><msup><mrow><mi>K</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>π</mi></mrow><mrow><mo>-</mo></mrow></msup></mrow></math> decays / LHCb Collaboration
A measurement of the time-dependent ratio of the D0K+π to ¯D0K+π decay rates is reported. The analysis uses a sample of proton-proton collisions corresponding to an integrated luminosity of 6 fb1 recorded by the LHCb experiment from 2015 through 2018 at a center-of-mass energy of 13 TeV. [...]
arXiv:2407.18001; LHCb-PAPER-2024-008; CERN-EP-2024-178; LHCB-PAPER-2024-008.- Geneva : CERN, 2025-01-01 - 25 p. - Published in : Phys. Rev. D 111 (2025) 012001 Fulltext: 2407.18001 - PDF; Publication - PDF; Related data file(s): ZIP; Suppelementary information: ZIP;

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2024-07-22
14:26
Study of charmonium production via the decay to pˉp at s=13TeV / LHCb Collaboration
Charmonium production cross-section in proton-proton collisions is measured at the centre-of-mass energy s=13TeV using decays to pˉp final state. The study is performed using a data sample corresponding to an integrated luminosity of 2.2fb1 collected in 2018 with the LHCb detector. [...]
arXiv:2407.14261; LHCb-PAPER-2024-004; CERN-EP-2024-165; LHCB-PAPER-2024-004.- Geneva : CERN, 2024-12-09 - 32 p. - Published in : Eur. Phys. J. C 84 (2024) 1274 Fulltext: 2407.14261 - PDF; document - PDF; Related data file(s): ZIP;

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