Running any SARAH-generated SPheno version produces a file called “Messages.out” containing some warnings. For example, for the SARAH model SM+Triplet/Real, running “bin/SPhenoTSM LesHouches.in.TSM” gives

Code: Select all

 sugra            1 .-iteration
 sugra            2 .-iteration
 Problem in Function B0, divergence for k->0, m1=m2=0
 Problem in Function B0, divergence for k->0, m1=m2=0
 Problem in Function B0, divergence for k->0, m1=m2=0
 Problem in Function B0, divergence for k->0, m1=m2=0
 Problem in Function B0, divergence for k->0, m1=m2=0
 Problem in Function B0, divergence for k->0, m1=m2=0
 Problem in Function B0, divergence for k->0, m1=m2=0
 Problem in Function B0, divergence for k->0, m1=m2=0
 Problem in Function B0, divergence for k->0, m1=m2=0
 C0: lambda(p1,p2,p3) < 0, unphysical configuration
 C0: lambda(p1,p2,p3) < 0, unphysical configuration
 C0: lambda(p1,p2,p3) < 0, unphysical configuration
 C0: lambda(p1,p2,p3) < 0, unphysical configuration
 C0: lambda(p1,p2,p3) < 0, unphysical configuration
 C0: lambda(p1,p2,p3) < 0, unphysical configuration
 C0: lambda(p1,p2,p3) < 0, unphysical configuration
 C0: lambda(p1,p2,p3) < 0, unphysical configuration
 C0: lambda(p1,p2,p3) < 0, unphysical configuration
 C0: lambda(p1,p2,p3) < 0, unphysical configuration
 C0: lambda(p1,p2,p3) < 0, unphysical configuration
 C0: lambda(p1,p2,p3) < 0, unphysical configuration
 C0: lambda(p1,p2,p3) < 0, unphysical configuration
 C0: lambda(p1,p2,p3) < 0, unphysical configuration
 C0: lambda(p1,p2,p3) < 0, unphysical configuration
 C0: lambda(p1,p2,p3) < 0, unphysical configuration
 C0: lambda(p1,p2,p3) < 0, unphysical configuration
 … [repeated many times]
 Higgs mass outside range of cross section fit (gluon fusion):            1
 Higgs mass outside range of cross section fit (vector boson fusion):            1
 Higgs mass outside range of cross section fit (associated W production):            1
 Higgs mass outside range of cross section fit (associated Z production):            1
 Higgs mass outside range of cross section fit (associated top production):            1
 Problem in Function B0, divergence for k->0, m1=m2=0
 Problem in Function B0, divergence for k->0, m1=m2=0
 Problem in Function B0, divergence for k->0, m1=m2=0
 Problem in Function B0, divergence for k->0, m1=m2=0
 Problem in Function B0, divergence for k->0, m1=m2=0
 Problem in Function B0, divergence for k->0, m1=m2=0
 Problem in Function B0, divergence for k->0, m1=m2=0
 Problem in Function B0, divergence for k->0, m1=m2=0
 Problem in Function B0, divergence for k->0, m1=m2=0
 Problem in Function B0, divergence for k->0, m1=m2=0
 Problem in Function B0, divergence for k->0, m1=m2=0
 Problem in Function B0, divergence for k->0, m1=m2=0
 Problem in Function B0, divergence for k->0, m1=m2=0
 Problem in Function B0, divergence for k->0, m1=m2=0
 Problem in Function B0, divergence for k->0, m1=m2=0

What is the origin/meaning of these warnings? Do I need to worry about them? In particular, why does it mention “sugra” when this model doesn’t really have anything to do with that?

Comes for instance from the neutriino corrections to the Z-selfenergies when using p2=0. However, this gets later multiplied by zero (the neutrino mass).
It's correct that SARAH calculates decays p1->p2 p3 at the loop level even if m1 is not bigger than m2+m3. The reason is that external Z-factors are used, where the decay amplitudes later are rotated to mass eigenstates.

Well, 'sugra' is still there since nobody changed it when SPheno/SARAH became independent of SUSY & supergravity.

Cheers,
Florian

Hi,

unrelated to the question, but also important for you: I just recognised that there is a bug in the TSM model file. It must be
The 1/Sqrt[2] for phiT was wrong because this leads to kinetic terms which are not canonical normalised.

Cheers,
Florian