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0 votes
0 answers
27 views

Can we deduce if a filed force is atractive in some situation from the differential cross-section?

When a beam of particles is directed against a target, the particles in the beam become scattered in different directions. The differential cross-section tries to describe this scattering: $$\frac{\...
Davius's user avatar
  • 1,640
0 votes
1 answer
261 views

Conceptual meaning of differential cross section with respect to theta

By doing a seminar paper about Compton scattering I came across two different differential cross-sections: $\frac{d\sigma}{d\Omega}$ and $\frac{d\sigma}{d\theta}$ where $\theta$ is the scattering ...
Jakov's user avatar
  • 35
2 votes
0 answers
283 views

$2 \to 2$ scattering cross section in arbitrary theory

What is the general method to compute the $2 \to 2$ scattering cross section given an arbitrary Lagrangian ? I would like a step by step recipe that can be easily implemented in Mathematica. For ...
Nichola's user avatar
  • 159
0 votes
2 answers
401 views

How is strong coupling constant related to cross section?

I've been looking through different Pdfs /articles on strong coupling constant and nearly all of them involve cross section, I've understood what cross section is but not how is it connected to ...
mevis's user avatar
  • 141
2 votes
1 answer
312 views

How to determine the sign of coupling constant in quantum field theory?

Experimentally, we determine the value of the coupling constant by measuring the scattering cross-section and compare it with the results calculated by the scattering amplitude. However, in the ...
feng lin's user avatar
  • 547
1 vote
1 answer
2k views

Difference between cross section and probability of interaction

When I read some textbooks I find that the definition of cross section is the probability. Of incident neutron interact with a matter .but I find many other (cross section of fission, scattering, ...
Aster Phoenix's user avatar
2 votes
0 answers
140 views

For which values of $n$ and $n'$ are $n \to n'$ particle scattering cross-sections well-defined?

When studying particle interaction events in QFT, we usually consider either (a) $2 \to 2$ particle "scattering" events, whose probabilities are quantified by scattering cross-sections, or (b) $1 \to ...
tparker's user avatar
  • 48.4k
2 votes
1 answer
2k views

From a cross section to a probability

This is homework problem: Given the cross-section of a neutrino-electron scattering, what is the probability for a solar neutrino to scatter with a electron as it goes through the center of the Earth? ...
user41746's user avatar
  • 489
3 votes
3 answers
143 views

Do molecular bounded systems shield or reduce neutron cross-sections?

When talking about neutron cross-sections, literature is usually investigating isolated cases of Neutron + Atom. Here, the abundance of hydrogen is dominating neutron fluxes through material. I ...
Martin's user avatar
  • 1,108