Abstract
We study the simulation of initial-state radiation in angular-ordered parton showers in order to investigate how different interpretations of the ordering variable affect the logarithmic accuracy of such showers. This also enables us to implement a recoil scheme which is consistent between final-state and initial-state radiation. We present optimal values of the strong coupling and intrinsic transverse momentum to be used in each version of the parton shower, tuned using Z0-boson production at the LHC at 7 TeV. With these tuned showers, we perform a phenomenological study of the Drell-Yan process at several centre-of-mass energies.
Highlights
Research in this area over the last decade has focused on matching the parton shower with fixed-order hard processes, but there have been recent attempts to improve the parton shower algorithms themselves
In this paper we have generalized our previous study [4] of the logarithmic accuracy of angular-ordered parton showers to include initial-state radiation
To the final-state case, we find that the q2-preserving scheme has problems in the strongly-ordered regime, with later emissions being able to modify the kinematics of an earlier soft emission and diminish its logarithmic accuracy
Summary
We consider the emission of initial-state radiation from a parton coming from a proton. Space-like partons are always considered massless, while the time-like parton can have a mass mj = 0. This means that when a g → bb splitting is considered, one quark will be considered as massless, while the final-state one will be treated as massive. That the transverse momenta are defined relative to the direction of P and n.
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