Must we add QED correction to perturbative QCD?

In summary, the conversation discusses the relationship between high momentum, strong interaction, and perturbative QCD. It is mentioned that when considering large momentum, the electric force between quarks cannot be neglected and QED correction may need to be added to perturbative QCD. The conversation also touches on the symmetry corresponding with lepton and baryon number conservation laws, and suggests that SU(2)xU(1) symmetry corresponds with lepton number conservation and SU(3) symmetry corresponds with baryon number conservation. It is noted that due to these conservation laws, when considering the hadron sector, there is no need to consider the lepton sector and vice versa. It is also mentioned that in some cases, the le
  • #1
ndung200790
519
0
Please teach me this:
It seem to me that when we consider high momentum,then the strong interaction become asymtotic week force,so we can use perturbative QCD.But at the same time,when considering large momentum,the ''electric charge'' became large,then the ''electric force'' between quarks can not be neglected.So must we add the QED correction to perturbative QCD?
Thank you very much in advance.
 
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  • #2
By the way, what is the symmetry corresponding with the lepton,barion...number conservative laws?
 
  • #3
At the moment,I think that lepton number convervative law corresponds with SU(2)xU(1) symmetry and barion number conservative law corresponds with SU(3) symmetry.Because of the conservative laws,when we consider hadron sector we need not consider lepton sector and vice versa(meaning we need not consider QED correction in perturbative QCD in many cases).Is that correct?
 
  • #4
I hear that still in framework of standard model,there are some cases that the lepton number conservative law is violated.Then how about the combination of QED and QCD in this case?
 
  • #5
Sorry,I have mistaken:the lepton number conservation violate in each family,but still being conservative in considering all families of leptons.
 
  • #6
Now I hear that neutrino has tiny mass,then standard model is slightly broken and lepton number conservation is violated?
 
  • #7
In collision of electron and proton,if we have imagination of quarks being electric chargeless,then the collision was only elastic collision but could not produce hadrons other proton?(meaning output particle were electron and proton).In annihilation process of electron and positron producing hadrons,first the electro force process happens(through virtue photon) producing quarks,after that the strong force happends producing hadrons?
 
  • #8
How can we explain the strong force process happen in collision between lepton and hadron producing new hadrons?
 

1. What is QED correction in perturbative QCD?

QED correction refers to the incorporation of quantum electrodynamics (QED) effects into perturbative quantum chromodynamics (QCD) calculations. This is necessary because QCD and QED are the two fundamental theories that describe the interactions of subatomic particles, and they both play a role in the behavior of particles at high energies.

2. Why do we need to add QED correction to perturbative QCD?

QCD and QED have different mathematical descriptions and parameters, so they cannot be directly combined. In order to accurately describe the behavior of particles at high energies, we need to incorporate the effects of both theories. QED corrections are particularly important for processes involving light particles, such as electrons and photons.

3. How do QED corrections affect perturbative QCD calculations?

QED corrections can have a significant impact on perturbative QCD calculations. They can change the predicted cross-sections for particle interactions, as well as the energy dependence and angular distribution of the particles involved. In some cases, QED corrections can even make the difference between a predicted process being possible or impossible.

4. Are QED corrections always necessary for perturbative QCD calculations?

No, QED corrections are not always necessary for perturbative QCD calculations. In some cases, the QED effects may be negligible and can be safely neglected. However, for precision calculations and in processes involving light particles, QED corrections are typically included to ensure accuracy and consistency with experimental data.

5. How are QED corrections incorporated into perturbative QCD calculations?

QED corrections are typically incorporated into perturbative QCD calculations through the use of renormalization techniques, which allow for the combination of the two theories. This involves calculating the contributions from QED interactions and then subtracting them from the QCD calculations. This process can be complex and requires advanced mathematical methods, but it allows for precise predictions of particle behavior at high energies.

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