All Questions
Tagged with strong-force particle-physics
15
questions with no upvoted or accepted answers
2
votes
0
answers
121
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Are Feynman diagrams equivalent when gluons are emitted from different quarks?
3rd year physics undergrad here. I am new to particle physics.
We were asked to give the lowest order Feynman diagram of this reaction.
$$K_1^+(1400) \to K^+ \pi^+\pi^- $$
Now I came up with not ...
2
votes
1
answer
148
views
What happens if a neutron flies towards a nucleus?
Rutherford experiment shows that alpha-particles when they fly towards metal foil sometimes (in minority of cases) can bounce. An explanation proposed was that atoms in fact have positively charged ...
user168013
2
votes
0
answers
127
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Yukawa exchange model
For my physics class I have to answer the following question.
Why do we need two pion exchange and rho meson exchange , and not just one pion in order to explain the strong interaction.
My thought is ...
- 31
1
vote
0
answers
60
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What causes the difference in ranges of forces?
What causes the difference in ranges of forces? In other words, why is it that the weak force acts only at small distances whereas the Coulomb force has a very large range?
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1
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0
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92
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What is it about the mechanism for the strong force which creates a force?
So as I understand it, the mechanism for the strong force is that quarks emit/exchange gluons. Similarly, quark-anti-quark pairs are what pass between nucleons in an atom causing them to stick to each ...
- 19
1
vote
0
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244
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How are length and time scales for the different kinds of interactions (strong, weak, electroweak) determined?
I was recently asked what the length scale of the strong interaction is and found my self a bit lost at the question. A quick Google search revealed a result of $10^{-15}\,\text{m}\approx 1\,\text{GeV}...
- 1,215
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58
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Kinetic energy of quarks in a proton
If we say that a proton has a kinetic energy of 50 GeV, can we say that each of the three quarks that compose it have roughly a mean energy of $\approx \frac{50}3=17$ GeV?
- 13
0
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1
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45
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A very basic question about particle (leptons, hadrons) interactions
Suppose a particle reaction $A+B\to C+D$ is allowed in nature. Then, the reactions,
\begin{align}
A&\to \bar{B}+C+D,\\ \bar{C}+\bar{D}&\to \bar{A}+\bar{B},\\ B&\to\bar{A}+C+D,\\& \...
- 11.8k
0
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61
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How do mesons explain nuclear stability?
I understand that nuclear stability is explained by the presence of the residual nuclear force, which in turn is a result of the strong nuclear force, which I believe, is mediated between quarks via ...
0
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79
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Can we say that binding energy is the work done by the strong nuclear force?
I know that the strong nuclear force is the force that holds the nucleus together by overcoming electromagnetic repulsion between protons. Binding energy is the minimum energy that is required to ...
- 337
0
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33
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How can I build up my knowledge in particle physics to the level that I can calculate the path of elementary particles in a perfect vacuum?
I have to write a research paper (don't know the exact english translation) for school. The question I want the paper to answer/discuss is: 'Can the universe be predicted at sub-atomic level?'
The ...
- 1
0
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68
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How is strong coupling constant measured through deep inellastic scattering (DIS)?
is deep inelastic scattering a process? and how is it (DIS) used to measure strong coupling constant?
the traditional method of measuring $α_S$ in deep inelastic scattering is from the strength of ...
- 141
0
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0
answers
412
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Asymmetry in p-p, n-n and n-p interactions
Why does the asymmetry exist between the proton-proton, neutron-neutron and neutron-proton strong interactions in the nucleus (which results in nuclei preferring equal numbers of neutrons and protons)?...
- 975
0
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164
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Why is the decay $\rho ^+ \rightarrow \rho ^0 \pi^+$ allowed by parity conservation and angular momentum conservation?
In the following decay:
$$\rho ^+ \rightarrow \rho ^0 \pi^+$$
where $\rho^+$ and $\rho^0$has $J^P = 1^-$ and $\pi^+$ has $J^P = 0^-$
The parity conservation $P$ entails that $L$ (orbital angular ...
user63248
0
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0
answers
188
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Energy conservation when exchanging meson
In Prob 1.2 of Griffith's "Introduction to Elementary Particles" 2nd ed., it says that:
However, I don't understand why it states that "they must temporarily violate the conservation of energy by ...
- 198