Version 1 (modified by 12 years ago) ( diff ) | ,
---|
Yes, you can, the shape of distributions are kept. However the normalization change. In the case you use scalefact and alpsfact in the run_card, this change of scales can be compensated by using the parameters %$PARP(64)$% and %$PARP(72)$%. Let's see this in more details:
For ME, the parameters are as follows:
- scalefact multiplies the (linear) factorization scale and
- for non-matched production also the renormalization scale since those are set equal in this case
- for matched production the renormalization scale of QCD vertices that are not considered "extra jet" vertices
- alpsfact multiplies the renormalization scale for extra jets for matched production only.
For Pythia, the parameters are:
- For spacelike showers: PARP(64) is factor of %$K_{T}{2}$% (note squared, so alpsfact=2 corresponds to PARP(64)=4)
- For timelike showers: %$\Lambda_{QCD}$% is given in PARP(72), so this value should be multiplied by 0.5 when alpsfact is 2, and by 2 when alpsfact is 0.5. The default value is 0.25 !GeV.
-- Main.SimonDeVisscher - 02 Mar 2009
Attachments (4)
- latexfcc48017bd73e5281e5cb2010d569394.png (522 bytes ) - added by 12 years ago.
- latex3a01b8d8a66b4758d77c4b3420b568e1.png (349 bytes ) - added by 12 years ago.
- latex2c18c2b6d3164afcd65aeebd714de401.png (531 bytes ) - added by 12 years ago.
- latexa6670ec3b04c8b52d9976f239dedfda8.png (303 bytes ) - added by 12 years ago.
Download all attachments as: .zip
Note:
See TracWiki
for help on using the wiki.