Formulae for diphoton SFs adapted according to run-3 discussions, CSEV SF included
Implementing Run-3 CSEV SF from Junquan's presentation. Please check if it is as intended, @jtao. Addressing issue #88 (closed).
For other diphoton SFs, using formula shown in S14 of Suman's presentation.
Edited by Florian Alexander Mausolf