Changes between Version 20 and Version 21 of ComplexMassScheme


Ignore:
Timestamp:
Aug 13, 2015, 3:23:01 AM (9 years ago)
Author:
Valentin Hirschi
Comment:

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  • ComplexMassScheme

    v20 v21  
    99The CMS implementation is rather straightforward at leading-order (LO) but it becomes more involved at next-to-leading-order (NLO) because of mainly two points
    1010 * The widths must be LO accurate at least in the offshell region and NLO accurate in the onshell region.
    11  * Because of the modified onshell renormalization condition in the CMS, the logarithms appearing in the UV wavefunction renormalization must be evaluated in the correct Riemann sheet.
     11 * Because of the modified onshell renormalization condition in the CMS, the logarithms appearing in the UV wavefunction renormalization counterterms must be evaluated in the correct Riemann sheet.
    1212
    1313The details of these issues will be discussed in a forthcoming publication;  this wiki page is mainly to describe the various options to the command '{{{check cms}}}' which automatically tests the consistency of the CMS implementation. The core idea of the test is to compare amplitudes in the CMS scheme ($\mathcal{A}_{\text{CMS}}$) and in the case of widths set to zero ($\mathcal{A}_{\Gamma=0}$) for a given kinematic configuration where all resonances are far off-shell.