[Flexiblesusy-commits] [FlexibleSUSY/FlexibleSUSY] 41ab09: disable check of 3L soft-squared beta functions ag...

[GitHub]

  Branch: refs/heads/feature-3l-MSSM-beta
  Home:   https://github.com/FlexibleSUSY/FlexibleSUSY
  Commit: 41ab095d618f0a3f087e7bfd1aa82fe14fc1ed8e
      https://github.com/FlexibleSUSY/FlexibleSUSY/commit/41ab095d618f0a3f087e7bfd1aa82fe14fc1ed8e
  Author: Alexander Voigt <Alexander.Voigt at desy.de>
  Date:   2015-12-04 (Fri, 04 Dec 2015)

  Changed paths:
    M test/test_CMSSM_model.cpp

  Log Message:
  -----------
  disable check of 3L soft-squared beta functions against Softsusy

The 3-loop soft-squared mass beta functions are buggy in SOFTSUSY <=
3.6.2.

The bug in the SOFTSUSY's expression is in the terms which are
proportional to a soft-squared mass and which are not proportional to
g3 at the same time.

I found that at least a part of the problem is due to a false
identification of tr(Ye*Yec*me) with tr(Yt*Ytc*mt):

Example:

Consider the 3L beta function for m_H1^2.  In allgennb.log there exist
(at 3-loop level) the three terms

  a1^2 * ( - 234/25*tr(Yt*Ytc*mt)
     - 3069/50*tr(Ye*Yec*me)
     + 27/50*tr(Ye*Yec*me)*k + ... )

In SOFTSUSY's implementation, however, the terms involving
tr(Ye*Yec*me) are missing.  Instead, in SOFTSUSY one finds

  a1^2 * ( - 234/25*tr(Yt*Ytc*mt)
     - 3069/50*tr(Yt*Ytc*me)
     + 27/50*tr(Yt*Ytc*mt)*k + ... )