Experiment	Measurement	Reference
ATLAS	\([2.8 ^{+1.2}_{-0.8}\mbox{ (stat)} \pm 0.3\mbox{ (syst)}]\)	CERN-PH-EP-2015-163
Average	\(\mathbf{[2.8 ^{+1.2}_{-0.9}\mbox{ (combined)}]}\)