The subsection Heavy_Flavor of the Collision_Term section can be used to modify the suppression parameters for AQM cross sections regarding bottom and charm hadrons. For example:

Collision_Term:
    Heavy_Flavor:
        AQM_Bottom_Suppression: 0.93
        AQM_Charm_Suppression: 0.8

AQM_Bottom_Suppression — double, optional, default = 0.93 — Conditions on key value: \(0\leq x\leq 1\)

Suppression parameter for AQM cross sections involving a bottom hadron. Default value taken from Angantyr (Bierlich:2022pfr [11]).

AQM_Charm_Suppression — double, optional, default = 0.8 — Conditions on key value: \(0\leq x\leq 1\)

Suppression parameter for AQM cross sections involving a charm hadron. Default value taken from Angantyr (Bierlich:2022pfr [11]).

Charm_Rescattering_Method — string, optional, default = "resonances" — Conditions on key value: Only valid strings

With this key, the method of charm rescattering at lower energies can be chosen for two to two reactions including charmed hadrons that are mentioned in Included_2to2.

"resonances" → Charm interactions are realized via resonance formations.
"T-matrix" → Tabulated cross sections (Abreu:2011ic [1], Tolos:2013kva [69], Torres-Rincon:2014ffa [70]) are used, which handle elastic and inelastic binary collisions.
Attention
Currently, only the following interactions are included: \( D\pi \leftrightarrow D\pi \), \( D\eta \leftrightarrow D\eta \), \( DK \leftrightarrow DK \), \( DN \leftrightarrow DN \), \( D\Delta \leftrightarrow D\Delta \), \( D^*\pi \leftrightarrow D^*\pi \), \( D^*\eta \leftrightarrow D^*\eta \), and \( D^*K \leftrightarrow D^*K \).
\( N \) refers to protons and neutrons and \(\Delta\) to \(\Delta\)(1232), including all their antiparticles, and D* to D*(2007) and D*(2010). All other interactions including charmed hadrons are treated via intermediate resonances.
When using this option of charm rescattering, Force_Decays_At_End should be set to true to handle decays properly.
"none" → Interactions of charmed hadrons will not be taken into account, i.e. their cross sections are set to zero.

Note: This config key facilitates disabling the two to two interactions of charmed hadrons that would otherwise be included via "Charm_T-matrix" in Included_2to2, without listing every possible value except "Charm_T-matrix".