Evolution variable dependence of jet substructure

Studies on jet substructure have evolved signicantly in recent years. Jet substructure is essentially determined by QCD radiations and non-perturbative eects. Predictions of jet substructure are usually dierent among Monte Carlo event generators, and are governed by the parton shower algorithm implemented. For leading logarithmic parton shower, even though one of the core variables is the evolution variable, its choice is not unique. We examine evolution variable dependence of the jet substructure by develop- ing a parton shower generator that interpolates between dierent evolution variables using a parameter �. Jet shape variables and associated jet rates for quark and gluon jets are used to demonstrate the �-dependence of the jet substructure. Wend angular ordered shower predicts wider jets, while relative transverse momentum (p?) ordered shower pre- dicts narrower jets. This is qualitatively in agreement with the missing phase space of p? ordered showers. Such dierence can be reduced by tuning other parameters of the show- ering algorithm, especially in the low energy region, while the dierence tends to increase for high energy jets.