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We show that the transverse momentum ($p_{T}$) spectrum of $Z$ bosonproduction measured at Fermilab Tevatron can be well reproduced byleading-order event generators if $Z$ + 1 jet processes are included with aproper solution for the double-count problem and if the parton shower (PS)branch kinematics are defined appropriately. The choice of the PS evolutionvariable does not definitely determine the low-$p_{T}$ behavior. Our new eventgenerator employing the limited leading-log (LLL) subtraction and a built-inleading-log PS reproduces the spectrum very well, not only in large $p_{T}$regions but also at low $p_{T}$ down to $p_{T}$ = 0.

Simulation of $Z$ boson $p_{T}$ spectrum at Tevatron by leading-order event generators