PRL 109, 131801 (2012)

LHCb: INSPIRE

ParameterMeasurement
\(\frac{ {\cal{B}} ( \bar{B}^0 \to \bar{D}^0 K^- K^+ )} {{\cal{B}} ( \bar{B}^0 \to \bar{D}^0 \pi^- \pi^+ )} \)\([0.056 \pm 0.110\mbox{ (stat)} \pm 0.007\mbox{ (syst)}]\)