Evidence for exclusive γγ → W + W − production and constraints on anomalous quartic gauge couplings in pp collisions at s = 7 $$ \sqrt{s}=7 $$ and 8 TeV

Evidence for exclusive γγ → W + W − production and constraints on anomalous quartic gauge couplings in pp collisions at s = 7 $$ \sqrt{s}=7 $$ and 8 TeV