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    Measurement of the relative width difference of the B0B^0-Bˉ0\bar B^0 system with the ATLAS detector

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    20 pages plus author list + cover page (38 pages total), 5 figures, 2 tables, submitted to Journal of High Energy Physics, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/BPHY-2015-01/ - See paper for full list of authorsInternational audienceThis paper presents the measurement of the relative width difference ΔΓd/Γd\Delta \Gamma_d / \Gamma_d of the B0B^0-Bˉ0\bar B^0 system using the data collected by the ATLAS experiment at the LHC in ppp p collisions at s=7\sqrt{s} = 7 TeV and s=8\sqrt{s} = 8 TeV and corresponding to an integrated luminosity of 25.2 fb1^{-1}. The value of ΔΓd/Γd\Delta \Gamma_d / \Gamma_d is obtained by comparing the decay-time distributions of B0J/ψKSB^0 \to J/\psi K_S and B0J/ψK0(892)B^0 \to J/\psi K^{*0}(892) decays. The result is \Delta \Gamma_d / \Gamma_d = (-0.1 \pm 1.1~\mbox{(stat.)} \pm 0.9~\mbox{(syst.)}) \times 10^{-2}. Currently, this is the most precise single measurement of ΔΓd/Γd\Delta \Gamma_d / \Gamma_d. It agrees with the Standard Model prediction and the measurements by other experiments

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