Journal Article Measurement of the relative width difference of the B0-B¯¯¯¯0 system with the ATLAS detector

The ATLAS collaboration  ,  Hara, K.  ,  Kim, S.H.  ,  Okawa, H.  ,  Sato, K.  ,  Ukegawa, F.

2016 ( 6 )  , p.81 , 2016-06 , Springer
This paper presents the measurement of the relative width difference ΔΓd/Γd of the B0-B¯¯¯¯0 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.

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