QCD vs QCD⊗QED
The evolution mode is controlled by the QED field in the theory card:
| Mode | QED |
Basis size | DGLAP objects | Coupling |
|---|---|---|---|---|
| Pure QCD | false |
13 × 13 | apfel::DglapObjects |
apfel::AlphaQCD |
| QCD+QED | true |
20 × 20 | apfel::DglapObjectsQCDQED |
apfel::AlphaQCDQED |
In QCD mode, PineAPFEL supports three convolution types (determined automatically from the grid):
UNPOL_PDF— unpolarised PDFsPOL_PDF— longitudinally polarised PDFsUNPOL_FF— unpolarised fragmentation functions
In QCD+QED mode, PineAPFEL currently supports:
UNPOL_PDF— unpolarised PDFs with QED corrections