Measurement of the relative width difference of the B0-B0 system with the ATLAS detector Aaboud, M. Aguilar Saavedra, Juan Antonio Atlas Collaboration, / B physics Hadron-Hadron scattering (experiments) This paper presents the measurement of the relative width difference ΔΓd/Γd of the B0-B0 system using the data collected by the ATLAS experiment at the LHC in pp collisions at √s = 7 TeV and √s = 8 TeV and corresponding to an integrated luminosity of 25.2 fb−1. The value of ΔΓd/Γd is obtained by comparing the decay-time distributions of B0 → J/ψKS and B0 → J/ψK*0(892) decays. The result is ΔΓd/Γd = (−0.1±1.1 (stat.)±0.9 (syst.)) × 10−2. Currently, this is the most precise single measurement of ΔΓd/Γd . It agrees with the Standard Model prediction and the measurements by other experiments. 2024-10-17T08:35:52Z 2024-10-17T08:35:52Z 2016-06-14 journal article The ATLAS collaboration., Aaboud, M., Aad, G. et al. Measurement of the relative width difference of the B0-B0 system with the ATLAS detector. J. High Energ. Phys. 2016, 81 (2016). https://doi.org/10.1007/JHEP06(2016)081 https://hdl.handle.net/10481/96049 10.1007/JHEP06(2016)081 eng http://creativecommons.org/licenses/by/4.0/ open access Atribución 4.0 Internacional Springer Nature