Changes between Version 1 and Version 2 of FAQ-Matching-2


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Timestamp:
04/06/12 16:33:02 (7 years ago)
Author:
trac
Comment:

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  • FAQ-Matching-2

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    22
    33Yes, you can, the shape of distributions are kept. However the normalization change.
    4 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 %$PARP(72)$%.
     4In 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 $PARP(72)$.
    55Let's see this in more details:
    66
     
    1313For Pythia, the parameters are:
    1414
    15    * For spacelike showers: PARP(64) is factor of %$K_{T}^{2}$% (note squared, so alpsfact=2 corresponds to PARP(64)=4)
    16    * 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.
     15   * For spacelike showers: PARP(64) is factor of $K_{T}^{2}$ (note squared, so alpsfact=2 corresponds to PARP(64)=4)
     16   * 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.
    1717
    1818-- Main.SimonDeVisscher - 02 Mar 2009
     
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