TY - CONF

T1 - Lifetime, mixing and CPV in ATLAS

AU - Skinner, Malcolm

PY - 2016/5/6

Y1 - 2016/5/6

N2 - The latest results measured by the ATLAS experiment on lifetime, mixing and CP violation in the B 0 and B 0 s systems are presented. First, the measurement of the B 0 s → J/ψφ decay parameters using 4.9 fb−1 and 14.3−1 of integrated luminosity collected by the ATLAS detector at the LHC in pp collisions at √ s = 7 TeV and √ s = 8 TeV respectively is given. The measured values include the CP-violating phase φs and the width difference of the mass eigenstates ∆Γs . The measurements for the 7 and 8 TeV data samples are combined, giving values of φs = −0.098±0.084(stat.)±0.040(syst.) rad and ∆Γs = 0.083±0.011(stat.)±0.007(syst.) ps−1 . The measured values agree with the Standard Model predictions. Second, the measurement of the relative width difference ∆Γd/Γd of the B 0–B¯0 system at √ s = 7 TeV and √ s = 8 TeV, corresponding to an integrated luminosity of 25.2 fb−1 is presented. The measured value is ∆Γd/Γd = (−0.1 ± 1.1 (stat.) ± 0.9 (syst.)) × 10−2 . Currently, this is the most precise single measurement of ∆Γd/Γd. It agrees with the Standard Model prediction and measurements by other experiments.

AB - The latest results measured by the ATLAS experiment on lifetime, mixing and CP violation in the B 0 and B 0 s systems are presented. First, the measurement of the B 0 s → J/ψφ decay parameters using 4.9 fb−1 and 14.3−1 of integrated luminosity collected by the ATLAS detector at the LHC in pp collisions at √ s = 7 TeV and √ s = 8 TeV respectively is given. The measured values include the CP-violating phase φs and the width difference of the mass eigenstates ∆Γs . The measurements for the 7 and 8 TeV data samples are combined, giving values of φs = −0.098±0.084(stat.)±0.040(syst.) rad and ∆Γs = 0.083±0.011(stat.)±0.007(syst.) ps−1 . The measured values agree with the Standard Model predictions. Second, the measurement of the relative width difference ∆Γd/Γd of the B 0–B¯0 system at √ s = 7 TeV and √ s = 8 TeV, corresponding to an integrated luminosity of 25.2 fb−1 is presented. The measured value is ∆Γd/Γd = (−0.1 ± 1.1 (stat.) ± 0.9 (syst.)) × 10−2 . Currently, this is the most precise single measurement of ∆Γd/Γd. It agrees with the Standard Model prediction and measurements by other experiments.

M3 - Conference paper

T2 - The 16th International Conference on B-Physics at Frontier Machines, "Beauty 2016

Y2 - 1 May 2016 through 6 May 2016

ER -