publication . Article . 2016

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

Cox, Brian; Watts, Stephen; Wyatt, Terence; Da Via, Cinzia; Pater, Joleen; Pilkington, Andrew; Price, Darren; Oh, Alexander;
Open Access English
  • Published: 14 Jun 2016
This paper presents the measurement of the relative width difference ΔΓd/Γd of the B0-B¯¯¯¯0B0-B¯0 system using the data collected by the ATLAS experiment at the LHC in pp collisions at s√=7s=7 TeV and s√=8s=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.
free text keywords: hep-ex
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