What is forward-backward assymetry, charge assymetry?

[kristobal hunta]

Hello!

I am studying particle physics. While reading the papers I realized that many authors of papers regarding the search for Odderon refer to "forward-backward assymetry", "charge assymetry". However, all my attepms to find a good description and definition of mentioned assymetries failed without a hint of success. Intuitively I understand that it should be a kind of "angle distribution" (for different charges it would be different probably?).

If you have learned anything about the assymetries could you please explain them to me.
Thank you :)

 

[Meir Achuz]

Hello!

I am studying particle physics. While reading the papers I realized that many authors of papers regarding the search for Odderon refer to "forward-backward assymetry", "charge assymetry". However, all my attepms to find a good description and definition of mentioned assymetries failed without a hint of success. Intuitively I understand that it should be a kind of "angle distribution" (for different charges it would be different probably?).

If you have learned anything about the assymetries could you please explain them to me.
Thank you :)

"forward-backward assymetry" can be with respect to a beam dilrection or the flight direction of a decaying particle. F-B symmetry would be when
there is no difference between event in the forward hemisphere than the backward hemisphere. Asymmetry is when there is a difference.

"charge assymetry" can have several meanings.
In nuclear physics, charge symmetry meant that there is no difference between n-n interactions and p-p interactions.
I don't think that's what you mean now.
In your context, it probably refers to more + particles than - particles from a neutral decay (or vv).

 

[arivero]

The point is, why is forward/backward assymmetry important in Z0 decays?

 

[Meir Achuz]

It would probably indicate parity nonconservaton.