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CMS_2015_I1385107

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A measurement of the underlying event (UE) activity in proton-proton collisions is performed using events with charged-particle jets produced in the central pseudorapidity region (|η|jet<2) and with transverse momentum 1pjetT<100 \text{GeV}. The analysis uses a data sample collected at a centre-of-mass energy of 2.76 \text{TeV} with the CMS experiment at the LHC. The UE activity is measured as a function of pjetT in terms of the average multiplicity and scalar sum of transverse momenta of charged particles, with |η|<2 and pT>0.5 \text{GeV}, in the azimuthal region transverse to the highest-pT jet direction. By further dividing the transverse region into two regions of smaller and larger activity, various components of the UE activity are separated.

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