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We study the simulation of initial-state radiation in angular-ordered partonshowers in order to investigate how different interpretations of the orderingvariable affect the logarithmic accuracy of such showers. This also enables usto implement a recoil scheme which is consistent between final-state andinitial-state radiation. We present optimal values of the strong coupling andintrinsic transverse momentum to be used in each version of the parton shower,tuned using $Z^0$-boson production at the LHC at 7 TeV. With these tunedshowers, we perform a phenomenological study of the Drell-Yan process atseveral centre-of-mass energies.

Initial State Radiation in the Herwig 7 Angular-Ordered Parton Shower