  Jets are identified and their properties studied in center-of-mass energy
sqrt(s) = 7 TeV proton-proton collisions at the Large Hadron Collider using
charged particles measured by the ATLAS inner detector. Events are selected
using a minimum bias trigger, allowing jets at very low transverse momentum to
be observed and their characteristics in the transition to high-momentum fully
perturbative jets to be studied. Jets are reconstructed using the anti-kt
algorithm applied to charged particles with two radius parameter choices, 0.4
and 0.6. An inclusive charged jet transverse momentum cross section measurement
from 4 GeV to 100 GeV is shown for four ranges in rapidity extending to 1.9 and
corrected to charged particle-level truth jets. The transverse momenta and
longitudinal momentum fractions of charged particles within jets are measured,
along with the charged particle multiplicity and the particle density as a
function of radial distance from the jet axis. Comparison of the data with the
theoretical models implemented in existing tunings of Monte Carlo event
generators indicates reasonable overall agreement between data and Monte Carlo.
These comparisons are sensitive to Monte Carlo parton showering, hadronization,
and soft physics models.
