f="MultipartonInteractions.html" target="page">rescattering</a> 
is switched on in the multiparton interactions scenario. For a normal 
interaction the rapidity and mass of a system is preserved when
primordial <i>kT</i> is introduced, by appropriate modification of the
incoming parton momenta. Kinematics construction is more complicated for 
a rescattering, and two options are offered. Differences between these 
can be used to explore systematic uncertainties in the rescattering 
framework.<br/>
The defaul