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The underlying event activity in proton-proton collisions at forwardpseudorapidity (-6.6 < eta < -5.2) is studied with the CMS detector at the LHC,using a novel observable: the ratio of the forward energy density, dE/d(eta),for events with a charged-particle jet produced at central pseudorapidity(abs(eta[jet]) < 2) to the forward energy density for inclusive events. Thisforward energy density ratio is measured as a function of the central jettransverse momentum, pt, at three different pp centre-of-mass energies (sqrt(s)= 0.9, 2.76, and 7 TeV). In addition, the sqrt(s) evolution of the forwardenergy density is studied in inclusive events and in events with a central jet.The results are compared to those of Monte Carlo event generators for ppcollisions and are discussed in terms of the underlying event. Whereas thedependence of the forward energy density ratio on jet pt at each sqrt(s)separately can be well reproduced by some models, all models fail tosimultaneously describe the increase of the forward energy density with sqrt(s)in both inclusive events and in events with a central jet.

Study of the underlying event at forward rapidity in pp collisions at sqrt(s) = 0.9, 2.76, and 7 TeV