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Measurement of the underlying event activity using charged-particle jets in proton-proton collisions at s√=2.76s=2.76 TeV
CMS Collaboration Sanders, Stephen J.
CMS Collaboration
Sanders, Stephen J.
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Abstract
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 (|ηjet| < 2) and with transverse momentum 1 ≤ pTjet < 100 GeV. The analysis uses a data sample collected at a centre-of-mass energy of 2.76 TeV with the CMS experiment at the LHC. The UE activity is measured as a function of pTjet in terms of the average multiplicity and scalar sum of transverse momenta (pT) of charged particles, with |η| < 2 and pT > 0.5 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. The measurements are compared to previous results at 0.9 and 7 TeV, and to predictions of several Monte Carlo event generators, providing constraints on the modelling of the UE dynamics.
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Date
2015-09-21
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Springer Verlag
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Keywords
Hadron-Hadron scattering, Particle correlations and fluctuations
Citation
Wang, W. Y., A. H. Chan, and C. H. Oh. "Measurement of the Underlying Event Activity Using Charged-Particle Jets in Protonâ Proton Collisions at $sqrt{s} = 2.76 ; textrm{TeV}$." Advanced Series on Directions in High Energy Physics Massive Neutrinos (2015): 283-94.