CERN Accelerating science

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1.
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 - 26 p. - Published in : JHEP 2412 (2024) 026 Fulltext: LHCb-PAPER-2024-028 - PDF; 2410.02502 - PDF; document - PDF; Related data file(s): ZIP; Supplementary information: LHCb-PAPER-2024-028-supplementary - ZIP; supplementary (3) - PDF;
2.
Transverse polarization measurement of Λ hyperons in pNe collisions at sNNsNN = 68.4 GeV with the LHCb detector / LHCb Collaboration
A measurement of the transverse polarization of the ΛΛ and ˉΛ¯Λhyperons in ppNe fixed-target collisions at sNNsNN=68.4 GeV is presented using data collected by the LHCb detector. The polarization is studied using the decay ΛpπΛpπ together with its charge conjugated process, the integrated values measured are PΛ=0.029±0.019(stat)±0.012(syst),PΛ=0.029±0.019(stat)±0.012(syst), PˉΛ=0.003±0.023(stat)±0.014(syst)P¯Λ=0.003±0.023(stat)±0.014(syst) Furthermore, the results are shown as a function of the Feynman xx variable, transverse momentum, pseudorapidity and rapidity of the hyperons, and are compared with previous measurements..
arXiv:2405.11324; CERN-EP-2024-121; LHCb-PAPER-2024-009.- Geneva : CERN, 2024-09-17 - 18 p. - Published in : JHEP 2409 (2024) 082 Fulltext: 2405.11324 - PDF; document - PDF; LHCb-PAPER-2024-009 - PDF; Related data file(s): ZIP;
3.
Search for the B0sμ+μγB0sμ+μγ decay / LHCb Collaboration
A search for the fully reconstructed B0sμ+μγB0sμ+μγ decay is performed at the LHCb experiment using proton-proton collisions at s=13s=13 TeV corresponding to an integrated luminosity of 5.4fb15.4fb1. No significant signal is found and upper limits on the branching fraction in intervals of the dimuon mass are set B(B0sμ+μγ)<4.2×108, m;(μμ)[2mμ, 1.70]GeV/c2,B(B0sμ+μγ)<7.7×108, m;(μμ)[1.70, 2.88]GeV/c2,B(B0sμ+μγ)<4.2×108, m;(μμ)[3.92, mB0s]GeV/c2,B(B0sμ+μγ)<4.2×108, m;(μμ)[2mμ, 1.70]GeV/c2,B(B0sμ+μγ)<7.7×108, m;(μμ)[1.70, 2.88]GeV/c2,B(B0sμ+μγ)<4.2×108, m;(μμ)[3.92, mB0s]GeV/c2, at 95% confidence level. [...]
arXiv:2404.03375; LHCb-PAPER-2023-045; CERN-EP-2024-065.- 2024-07-11 - 28 p. - Published in : JHEP 2407 (2024) 101 Fulltext: 2404.03375 - PDF; document - PDF;
4.
Study of CPCP violation in B0(s)toDK(892)0B0(s)toDK(892)0 decays with DKπ(ππ)DKπ(ππ), ππ(ππ)ππ(ππ), and KKKK final states / LHCb Collaboration
A measurement of CPCP-violating observables associated with the interference of B0D0K(892)0B0D0K(892)0 and B0¯D0K(892)0B0¯¯¯¯¯D0K(892)0 decay amplitudes is performed in the D0Kπ±(π+π),D0Kπ±(π+π), D0π+π(π+π)D0π+π(π+π), and D0K+KD0K+K final states using data collected by the LHCb experiment corresponding to an integrated luminosity of 99~fb1fb1. CPCP-violating observables related to the interference of B0sD0¯K(892)0B0sD0¯¯¯¯¯K(892)0 and B0s¯D0¯K(892)0B0s¯¯¯¯¯D0¯¯¯¯¯K(892)0 are also measured, but no evidence for interference is found. [...]
arXiv:2401.17934; LHCb-PAPER-2023-040; CERN-EP-2024-007; LHCB-PAPER-2023-040.- Geneva : CERN, 2024-05-03 - 31 p. - Published in : JHEP 2405 (2024) 025 Fulltext: document - PDF; 2401.17934 - PDF; Related data file(s): ZIP;
5.
Measurement of forward charged hadron flow harmonics in peripheral PbPb collisions at <math><mrow><msqrt><msub><mi>s</mi><mrow><mi>N</mi><mi>N</mi></mrow></msub></msqrt><mo>=</mo><mn>5.02</mn><mspace width="0.16em"/><mi>TeV</mi></mrow></math> with the LHCb detector / LHCb Collaboration
Flow harmonic coefficients, vnvn, which are the key to studying the hydrodynamics of the quark-gluon plasma (QGP) created in heavy-ion collisions, have been measured in various collision systems, kinematic regions, and using various particle species. The study of flow harmonics in a wide pseudorapidity range is particularly valuable to understand the temperature dependence of the shear viscosity to entropy density ratio of the QGP. [...]
arXiv:2311.09985; LHCb-PAPER-2023-031; CERN-EP-2023-240.- Geneva : CERN, 2024-05-15 - 12 p. - Published in : Phys. Rev. C 109 (2024) 054908 Fulltext: 2311.09985 - PDF; Publication - PDF; Related data file(s): ZIP;
6.
Measurement of the DD longitudinal polarization in B0Dτ+ντB0Dτ+ντ decays   / LHCb Collaboration
The longitudinal polarization fraction of the DD meson is measured in B0Dτ+ντB0Dτ+ντ decays, where the τ lepton decays to three charged pions and a neutrino, using proton-proton collision data collected by the LHCb experiment at center-of-mass energies of 7, 8 and 13 TeV and corresponding to an integrated luminosity of 5 fb1. The D polarization fraction FDL is measured in two q2 regions, below and above 7 GeV2/c4, where q2 is defined as the squared invariant mass of the τντ system. [...]
arXiv:2311.05224; LHCb-PAPER-2023-020; CERN-EP-2023-225.- Geneva : CERN, 2024-11-01 - 18 p. - Published in : Phys. Rev. D 110 (2024) 092007 Fulltext: 2311.05224 - PDF; Publication - PDF; Related data file(s): ZIP;
7.
A model-independent measurement of the CKM angle γ in partially reconstructed B±Dh± decays with DK0Sh+h(h=π,K) / LHCb Collaboration
A measurement of CP-violating observables in B±DK± and B±Dπ± decays is made where the photon or neutral pion from the DDγ or DDπ0 decay is not reconstructed. The D meson is reconstructed in the self-conjugate decay modes, DK0Sπ+π or DK0SK+K. [...]
arXiv:2311.10434; LHCb-PAPER-2023-029; CERN-EP-2023-241.- Geneva : CERN, 2024-02-16 - 30 p. - Published in : JHEP 2402 (2024) 118 Fulltext: LHCb-PAPER-2023-029 - PDF; Publication - PDF; 2311.10434 - PDF; Related data file(s): ZIP;
8.
Curvature-bias corrections using a pseudomass method / LHCb Collaboration
Momentum measurements for very high momentum charged particles, such as muons from electroweak vector boson decays, are particularly susceptible to charge-dependent curvature biases that arise from misalignments of tracking detectors. Low momentum charged particles used in alignment procedures have limited sensitivity to coherent displacements of such detectors, and therefore are unable to fully constrain these misalignments to the precision necessary for studies of electroweak physics. [...]
arXiv:2311.04670; LHCb-DP-2023-001; CERN-EP-2023-246.- 2024-03-12 - 22 p. - Published in : JINST 19 (2024) P03010 Fulltext: document - PDF; 2311.04670 - PDF;
9.
Measurement of the CKM angle γ in the B0DK0 channel using self-conjugate DK0Sh+h decays / LHCb Collaboration
A model-independent study of CP violation in B0DK0 decays is presented using data corresponding to an integrated luminosity of 9fb1 collected by the LHCb experiment at centre-of-mass energies of s=7,8 and 13 TeV. The CKM angle γ is determined by examining the distributions of signal decays in phase-space bins of the self-conjugate DK0Sh+h decays, where h=π,K. [...]
arXiv:2309.05514; LHCb-PAPER-2023-009; CERN-EP-2023-138.- Geneva : CERN, 2024-02-29 - 29 p. - Published in : Eur. Phys. J. C 84 (2024) 206 Fulltext: document - PDF; 2309.05514 - PDF; Related data file(s): ZIP; Supplementary information: ZIP;
10.
A search for rare BDμ+μ decays / LHCb Collaboration
A search for rare BDμ+μ decays is performed using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9 fb1. No significant signals are observed in the non-resonant μ+μ modes, and upper limits of B(B0¯D0μ+μ)<5.1×108, B(B+D+sμ+μ)<3.2×108, B(B0s¯D0μ+μ)<1.6×107 and fc/fuB(B+cD+sμ+μ)<9.6×108 are set at the 95 % confidence level, where fc and fu are the fragmentation fractions of a B meson with a c and u quark respectively in proton-proton collisions. [...]
arXiv:2308.06162; LHCb-PAPER-2022-048; CERN-EP-2023-121; LHCB-PAPER-2022-048.- Geneva : CERN, 2024-02-07 - 23 p. - Published in : JHEP 2402 (2024) 032 Fulltext: document - PDF; 2308.06162 - PDF; Related data file(s): ZIP;

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