A How Does the ss¯ Pair Affect the Partial Width Γ2 in Gluon Decays?

  • A
  • Thread starter Thread starter VikasRajG
  • Start date Start date
  • Tags Tags
    Particle physics
Click For Summary
The discussion centers on calculating the partial width Γi for gluon decays, specifically how the presence of an ss¯ pair affects Γ2. The initial example illustrates that Γ1 is proportional to the product of CKM matrix elements V2cb and V2cs. When introducing an additive gluon leading to an ss¯ pair, the relationship for Γ2 shifts to V2cb and V2cd, but the impact of the gluon on the decay width remains unclear. Participants express frustration over the lack of clarity on how to incorporate the gluon contribution into the decay width calculations. The conversation emphasizes the need for resources or articles on three-body decays to better understand these dynamics.
VikasRajG
Messages
3
Reaction score
0
TL;DR
How to calculate/estimate partial decay width of a decay when gluons decaying to a quark-antiquark pair are involved?
How do we normally calculate the partial width Γi for a decay involving gluons.Consider the following example:

feynmanbjks.png
feynmareal.png

in the first example, I know that one can estimate the partial width Γ1 using CKM matrix elements to get "Γ1 is directly proportional to V2cb V2cs
."Now, for the second diagram it is essentially the same but with an additive gluon going to ss¯¯¯

. Ofcourse, the partial width now changes to look like:
"Γ2 is directly proportional to V2cb V2cd
."BUT,this doesn't tell anything on how the gluon changes things. So what I want to know is, how exactly does the ss¯¯¯

pair changing the Γ2
!!!????If there are any sources/articles for this, it would be really helpful as I haven't found much regarding these 3 body decays!
 
Physics news on Phys.org
What are you looking for exactly? Someone to calculate the matrix element for you?
 
Have you even read the whole thing?
I know how to calculate the CKM matrix element, I am asking how to consider the gluon to ssbar contribution in decay width!
 
VikasRajG said:
Have you even read the whole thing?
In am not your servant. Don't treat me like one.

You put a propagator in for the gluon, and T matrices at each colored vertex.
 
Thank You!
Sorry for that, I was just a bit frustrated.
 
Thread 'Some confusion with the Binding Energy graph of atoms'

Thread 'Some confusion with the Binding Energy graph of atoms'

My question is about the following graph: I keep on reading that fusing atoms up until Fe-56 doesn’t cost energy and only releases binding energy. However, I understood that fusing atoms also require energy to overcome the positive charges of the protons. Where does that energy go after fusion? Does it go into the mass of the newly fused atom, escape as heat or is the released binding energy shown in the graph actually the net energy after subtracting the required fusion energy? I...
View full post »

Similar threads

I How often would a ϕ meson decay to a electron-positron pair?
Replies
2
Views
2K
I Why Do Gluons Decay into u-anti-u Pairs Instead of Z0 Bosons?
Replies
3
Views
1K
How Does the Mass of the Bottom Quark Affect Z Boson Decay Calculations?
Replies
6
Views
4K
I How do the collider experiments measure the mass of the W boson?
Replies
4
Views
4K
Particle Physics: Partial Decay Widths and Branching Ratios
Replies
5
Views
10K
I B -> s µµ decays: Current status
Replies
49
Views
12K
How Does Detector Resolution Affect the True Width of the J/psi Particle?
Replies
1
Views
4K
I How does the raster scan frequency affect the accuracy of a CRT TV picture?
Replies
32
Views
3K
B Decays affected by all new particles/fields?
Replies
18
Views
3K
A How Does MWI explain Type I PDC Photon Polarization Entanglement?
Replies
19
Views
414