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Article
Report number arXiv:1712.08683 ; LHCB-PAPER-2017-048 ; CERN-EP-2017-320
Title First measurement of the CP-violating phase ϕd¯ds in B0s(K+π)(Kπ+) decays
Author(s) LHCb Collaboration  Afficher les 798 auteurs
Publication 2018-03-23
Imprint 08 Jan 2018
Number of pages 33
Note All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2017-048.html
In: JHEP 03 (2018) 140
DOI 10.1007/JHEP03(2018)140
Subject category Particle Physics - Experiment ; hep-ex
Accelerator/Facility, Experiment CERN LHC ; LHCb
Free keywords flavor physics ; B physics ; polarization ; CP violation ; oscillation
Abstract A flavour-tagged decay-time-dependent amplitude analysis of B0s(K+π)(Kπ+) decays is presented in the K±π mass range from 750 to 1600 MeV/c2. The analysis uses pp collision data collected with the LHCb detector at centre-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3.0 fb1. Several quasi-two-body decay modes are considered, corresponding to K±π combinations with spin 0, 1 and 2, which are dominated by the K0(800)0 and K0(1430)0, the K(892)0 and the K2(1430)0 resonances, respectively. The longitudinal polarisation fraction for the B0sK(892)0¯K(892)0 decay is measured as fL=0.208±0.032±0.046, where the first uncertainty is statistical and the second is systematic. The first measurement of the mixing-induced CP-violating phase, ϕd¯ds, in bd¯ds transitions is performed, yielding a value of ϕd¯ds=0.10 ± 0.13 (stat) ± 0.14 (syst) rad.
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 Notice créée le 2018-01-08, modifiée le 2024-08-17


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