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A Measurement of the Underlying Event Distributions in Proton-Proton Collisions at sqrt(s) = 7 TeV in Events containing Charged Particle Jets using the ATLAS Detector at the Large Hadron Collider


Underlying Event distributions are studied in events containing at least one charged particle jet produced in proton-proton collisions at sqrt(s) = 7 TeV. Jets are reconstructed from charged particles using the anti-Kt algorithm with radius parameter R = 0.6. The jet with the largest transverse momentum (pT) and | η | ≤ 1.5 defines the azimuthal φ = 0 direction. Distributions of the charged particle multiplicity, the scalar sum of the transverse momenta of charged particles, and the average charged particle are measured as functions of jet pT in the transverse region (π / 3 ≤ | φ | ≤ 2 π / 3) for 4 GeV ≤ pTjet ≤ 100 GeV.

The data are compared to predictions from the Monte Carlo generators which have been tuned to data from the Large Hadron Collider,

and are found in to be good agreement.

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