Off-shell Particle Decay: Does Mass Affect Cross Section?

This is true regardless of whether the decay is off-shell or on-shell. In summary, the mass of a particle can affect the cross-section of a process, regardless of whether the decay is off-shell or on-shell.
  • #1
Safinaz
259
8
Hi all,

I think that the off shell decay dosn't decrease the decay cross section, I mean if a particle X
decays into a jet pair has mass for example Mjj ~ 130 GeV, being X has mass M ~ 130 GeV so decay
in resonance or on shell into jj or being MX even much greater ~ 2000 GeV , this won't affect the
cross section value . So is that right ?

Bests,
Safinaz
 
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  • #2
I don't understand what you are asking.
"decrease" the cross-section where, relative to what? "affect" in which way?

The particle mass influences the cross-section of a 130 GeV process. A particle mass of 130 GeV will lead to a larger cross-section than other particle masses.
 

1. What is off-shell particle decay?

Off-shell particle decay refers to the process in which a particle decays into other particles without being on its mass shell, meaning its energy and momentum do not satisfy the mass-energy relation. This type of decay typically occurs when the particle has a very short lifetime and does not have enough time to reach its mass shell before decaying.

2. How does off-shell particle decay differ from on-shell decay?

In on-shell decay, the particle decays into other particles while still on its mass shell, meaning its energy and momentum satisfy the mass-energy relation. This type of decay is more common for particles with longer lifetimes. Unlike off-shell decay, on-shell decay conserves energy and momentum.

3. How does mass affect the cross section of off-shell particle decay?

The cross section of off-shell particle decay is affected by the mass of the decaying particle. This is because the mass of the particle determines its lifetime and therefore the probability of it decaying before reaching its mass shell. A heavier particle will have a shorter lifetime and a smaller cross section for off-shell decay compared to a lighter particle.

4. What factors influence the cross section for off-shell particle decay?

Aside from the mass of the decaying particle, other factors that can influence the cross section for off-shell particle decay include the energy of the particle, the strength of the interaction responsible for the decay, and the masses of the particles it decays into.

5. How is off-shell particle decay studied and measured?

Off-shell particle decay is studied and measured through experiments using particle accelerators. By colliding particles at high energies, scientists can observe and measure the decay products and their properties, such as their energy and momentum. These measurements can then be used to study the cross section and other properties of off-shell particle decay.

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