# Questions tagged [quantum-chromodynamics]

Quantum-ChromoDynamics (QCD) is the quantum field theory believed to describe the strong nuclear force.

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### Asymptotic Freedom QCD

I'm trying to understand the derivation of asymptotic freedom with the renormalisation group equations. I'm reading Taizo Muta's book on QCD. What I don't understand is how he obtains the last ...
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### Colour Factor in QCD Pair Annihilation

My question occurred when I was reading Introduction to Elementary Particles by David J. Griffiths. In chapter 8, part 8.5, he is calculating the colour factor of quark-antiquark annihilation. My ...
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### Quark-Gluon vertex 1-loop correction in QCD

I'm trying to calculate the one loop correction to the quark-gluon vertex of QCD using euclidean formalism ($x^0 \rightarrow -ix^4$) and I'm having trouble to compute the integral in the picture below....
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### What is the meaning of dynamically generated states in particle physics?

In hadron spectroscopy, a structure may be interpreted as various "configurations", such as conventional quark-antiquark states, tetraquarks, hybrid states, dynamically generated states or ...
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### Do all antiquarks carry and anti-color charge, or can they carry RGB color charges as well?

I know there are antiquarks with anticolor charges. Are there also antiquarks that instead carry color charges? Basically, which of these lists describes the types of quarks that there are: List one: ...
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### Euclidean LQCD not on a lattice?

How much the idea of calculating Euclidean path integrals in LQCD is fundamentally tied to using formulations based on the discretized spacetime lattice? In computational approaches to quantum many-...
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### How relevant is the electric charge of quarks within hadrons?

Given that each quark flavor has a particular electric charge (i.e., either +2/3 or -1/3): how do these charges effect the internal dynamics of hadrons? Do the attractive and repulsive effects of ...
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### Deriving Euler-Lagrange Equations in Light-Front Quantization from the Heisenberg Equation

I'm delving into light-front quantization, with a focus on understanding the roles of good and bad fermions. Using Collins' formulation in Foundations of Perturbative QCD, we define the projectors as: ...
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### How can dense quark matter stabilize wormholes?

I have read in several articles, such as https://www.sciencedirect.com/science/article/abs/pii/S0577907323000266 and https://arxiv.org/abs/1403.0771 that dense quark matter can stabilize wormholes. ...
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### QCD in Coulomb Gauge Kernel Expansion

I was re-reading the Hamiltonian QCD in Coulomb gauge section in Particle Physics and Introduction to Field Theory by T.D. Lee and I was trying to understand better the form of the Coulomb kernel that ...
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### Why is it justified to focus on gauge transformations constant at spatial infinity in QCD instantons?

In the context of Yang-Mills theories and QCD instantons, much of the literature and conventional treatment hinges on the consideration of gauge transformations that remain constant at spatial ...
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