Experiment	Measurement	Reference
Belle	\([2.4 ^{+0.5}_{-0.4}\mbox{ (stat)} \pm 0.3\mbox{ (syst)} \pm 0.3\mbox{ (fs)}] \times 10^{-3}\)	PRL 104, 231801 (2010)
Average	\(\mathbf{[2.4 ^{+0.7}_{-0.6}\mbox{ (combined)}] \times 10^{-3}}\)