PDG code of particles

Questions about the interface between SARAH and SPheno as well as the FlavorKit functionality
Post Reply
Amin
Posts: 65
Joined: 7. Jun 2017, 19:38

PDG code of particles

Post by Amin » 12. Nov 2018, 17:01

Hi Florian,

I noticed that in the output of SPheno, the particles are ranked in increasing order of mass regardless of their PDG codes. For example, left stau (Se_3) PDG code is 1000015 and that for left selectron (Se_1) is 1000011. For my model point, the stau is lighter than the selectron, so instead of keeping the correct order, SPheno now gives 1000011 to the lighter one which is stau and still call it Se_1. I could tell after looking at the decay channel which is stau -> tau + \chi, which turned out to be 1000011 -> 15 + 1000022 instead of 1000015 -> 15 + 1000022.
How can I force SPheno to respect the PDG code for each particle?
Thank you.

Best,
Amin

FStaub
Site Admin
Posts: 822
Joined: 13. Apr 2016, 14:05

Re: PDG code of particles

Post by FStaub » 13. Nov 2018, 05:57

Hi,

This mass ordering is a proper PDG scheme and SPheno by SARAH always uses it.
You can read from the rotation matrix (ZE) what character your field is.

Cheers
Florian

Amin
Posts: 65
Joined: 7. Jun 2017, 19:38

Re: PDG code of particles

Post by Amin » 13. Nov 2018, 16:29

Hi Florian,

Got it. I will check the rotation matrices for this purpose.
I should note that the main SPheno models (not from SARAH) do not have the same nomenclature. I mean, the sleptons, for example, are not named Se_1, Se_2, etc ... but rather ~e_L, ~e_R, etc ... and this eliminates the confusion. I wonder why SARAH cannot do that.
In all cases, I will follow your tip.

Thank you,
Amin

Post Reply