We report a set of measurements of particle production in
inelastic p anti-p collisions collected with a minimum-bias trigger
at the Tevatron Collider with the CDF II experiment. The inclusive
charged particle transverse momentum differential cross section is
measured, with improved precision, over a range about ten times wider
than in previous measurements. The former modeling of the spectrum
appears to be incompatible with the high particle momenta observed.
The dependence of the charged particle transverse momentum on the event
particle multiplicity is analyzed to study the various components of
hadron interactions. This is one of the observable variables most poorly
reproduced by the available Monte Carlo generators. A first measurement
of the event transverse energy sum differential cross section is also
reported. A comparison with a PYTHIA prediction at the hadron level is
performed. The inclusive charged particle differential production cross
section is fairly well reproduced only in the transverse momentum range
available from previous measurements. At higher momentum the agreement
is poor. The transverse energy sum is poorly reproduced over the whole
spectrum. The dependence of the charged particle transverse momentum on
the particle multiplicity needs the introduction of more sophisticated
particle production mechanisms, such as multiple parton interactions,
in order to be better explained.
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Updated: Tuesday, 2009 July 07 13:41:22 CDT automatically from input from carol picciolo