Evolution of parton showers and parton distribution functions
arXiv:2002.04125 · doi:10.1103/PhysRevD.102.014025
Abstract
Initial state evolution in parton shower event generators involves parton distribution functions. We examine the probability for the system to evolve from a higher scale to a lower scale without an initial state splitting. A simple argument suggests that this probability, when multiplied by the ratio of the parton distributions at the two scales, should be independent of the parton distribution functions. We call this the PDF property. We examine whether the PDF property actually holds using Pythia and Deductor. We also test a related property for the Deductor shower and discuss the physics behind the results.
18 pages, 8 figures, including an appendix; close to accepted version
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- On the role of soft gluons in collinear parton densities and parton shower event generators
- Multivariable evolution in final state parton shower algorithms
- Multivariable evolution in parton showers with initial state partons
- Collinear and TMD distributions with dynamical soft-gluon resolution scale