Simulation of $Z$ boson $p_T$ spectrum at Tevatron by leading-order event generators

Abstract

We show that the transverse momentum ($p_T$) spectrum of $Z$ boson production measured at Fermilab Tevatron can be well reproduced by leading-order event generators if $Z$ + 1 jet processes are included with a proper solution for the double-count problem and if the parton shower (PS) branch kinematics are defined appropriately. The choice of the PS evolution variable does not definitely determine the low-$p_T$ behavior. Our new event generator employing the limited leading-log (LLL) subtraction and a built-in leading-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.

13 pages, 4 figures: explanations were added to clarify the discussions. Minor changes for publication

References in corpus (7)

• The Transverse Momentum and Total Cross Section of E+ E- Pairs in the Z-Boson Region from P Anti-P Collisions at s**(1/2) = 1.8-Tev
• Measurement of the shape of the boson transverse momentum distribution in ppbar -> Z/gamma* -> ee+X events produced at sqrt{s}=1.96 TeV
• Transverse-momentum resummation: a perturbative study of Z production at the Tevatron
• Higgs Production: A Comparison of Parton Showers and Resummation
• QCD event generators with next-to-leading order matrix-elements and parton showers
• GR@PPA 2.7 event generator for $pp$/$p\bar{p}$ collisions
• Initial-state parton shower kinematics for NLO event generators

Cited by in corpus (7)

• GR@PPA 2.8: initial-state jet matching for weak boson production processes at hadron collisions
• Consistent simulation of non-resonant diphoton production at hadron collisions with a custom-made parton shower
• Consistent simulation of direct-photon production in hadron collisions including associated two-jet production
• ME-PS matching in the simulation of multi-jet production in hadron collisions using a subtraction method
• Consistent simulation of non-resonant diphoton production in hadron collisions including associated jet production up to two jets
• Precise simulation of the initial-state QCD activity associated with $Z$-boson production in hadron collisions
• GR@PPA 2.9: radiation matching for simulating photon production processes in hadron collisions