Measurement of the exclusive ${\rm Y}$ production cross-section in $pp$ collisions at $\sqrt{s}=$7 TeV and 8 TeV

LHCb collaboration, R. Aaij, B. Adeva +705

A study is presented of central exclusive production of ${\rm Y}(nS)$ states, where the ${\rm Y}(nS)$ resonances decay to the ${\mu }^{+}{\mu }^{-}$ final state, using $pp$ collision data recorded by the LH…