Recent content by Hluf

Hello to all When we study the Confinement of QCD, the coupling strength increases as the momentum transfer decreases (i.e, p→0) and the coupling strength decreases as the momentum transfer increases (i.e, p→∞). My question is: can we say ω =m; where ω is the energy which is given as...

When we describe the amplitude of two interacting particles, we are integrating w.r.t the relative momentum of the particles. Why we do this? Thank you all of you.

Dear All, I need some explanations of properties of tensor and the tensor product on different states; σ1ijσij2=_____________ Thank you.

Dear all; why we study hadron physics? For instance different people calculates the decay constant of mesons using different methods and they get approximately the same result, the difference is too small. So why not people they apply the same mathematical method?

Dear all When we calculating the cross section of particles, we apply the trace calculation. This is not clear for me, why we use the trace calculation? Thank you all.

I am not clear with the difference of heavy and light mesons; 1. what is their difference? 2. how can we treat their decay properties? 3.for instance many people describe them using the Bethe-Salpeter equation at 4-dimension or at 3-dimension. which one is the better method? To help me...

Mass of pion meson We know pion is the composite of up and down quarks. The mass of charged pion is 139.6 Mev/Mev/c2 and mass of u=1.7 to 3.0 Mev/c2 and mass of d=4.1 to 5.7Mev/c2. From these we see that the mass of single quark greater than the mass of the pion. This is my question, why? Any...

Mass of pion meson We know pion is the composite of up and down quarks. The mass of charged pion is 139.6 Mev/c and mass of u=1.7 to 3.0 Mev/c2 and mass of d=4.1 to 5.7Mev/c2. From these we see that the mass of single quark greater than the mass of the pion. This is my question, why? Any one...

Why not have a single value? For instance; q=1/2(p1-p2), if we consider at center of mass collision for equal mass particle, i.e. p1=(p,im1) and p2=-p[/B,im2] then q becomes q=1/2((p1+p2),i(m1-m2)) but for equal mass, p1=p2)=p where p is a vector q=1/2(2p,0)⇔q=([B]p,0)→why not this, the...

When we study the bound state of quarks, i.e. mesons, the relative momentum is given as; q=1/2(p1-p2). Where p1 and 2, are momentum of quark and anti-quark, respectively.My question is, what is the value of q at center of mass frame? For example, P=(0,iM), at center of mass frame, where P is...

For instance, on the leptonic decays of mesons, the Bethe-Salpeter wave function expresses in terms of the hadron quark-antiquark vertex function of mesons. see the following journal on google; A.N. Mitra, S. Bhatnagar, Intl. J. Mod. Phys. A7, 121(1992)

I need to know the relation of wave function and vertex function of mesons. Any one give me an explanation of them. Are they same? in some journals their expressions are the same and in other papers the wave function expresses as a function of the vertex function of meson. Which one is the...

I'm a new comer to study the hadron physics.Why light quarks are more stable than heavy quarks and which one is easy to study? why? Thank you

We say on-shell and off-shell mass of quarks. 1) What is the difference on-shell and off-shell mass of quarks. 2) At lab. center of mass frame for lepton particles p2= -m2. Can we apply this equation for quarks. Thank you!

Hi every one, This time i am studying Quantum field theory and some times we call also high energy physics. But when we study QCD, more we focus on the confinement part, i.e non-perturbative part. That means low energy or large distance. My question is, can we consider non-perturbative QCD as...