Strong interaction Definition and 34 Threads

The strong nuclear force keeps the protons together. The larger the number of protons, the larger the nucleus, but the weaker the bonds between the protons as the radius of the nucleus increases and more unstable is the element. However, since the strong nuclear force originates from within each...

The longer-range inter-nucleon force is not a direct result of the gluon field, but is indirectly affected by a quark-antiquark pair (meson). If this ‘residual’ strong interaction between nucleons is mediated by a π-meson, then what is the maximum time period in which the interaction takes...

The deuterium exists only with the proton and neutron of aligned spin, which suggests that the residual strong force is greated with aligned spins, i.e. the binding energy is greater if the spins are aligned. On the other hand the mass of ##\Delta^{+}## is greater than the mass of proton ##p##...

Any recommedations for intro into the weak force? Also ones for the strong force?

The strong interaction outside nucleons - what mediates it? Is it gluons? Is it mesons? Is it gluons within mesons? Thank you.

Is there any type interaction between neutron and matter other than strong interaction? When a neutron elastically or inelastically scattered, does the strong interaction still govern the whole process? Thank you!

Hi everyone, I have the following question When a positive pion interacts with a proton, a kaon can be produced, along with another strange particle, as shown in this equation \pi^++\textrm{P}\longrightarrow \textrm{K}^++\textrm{X} Circle the type of interaction shown...

Homework Statement In electromagnetic interactions, the force carrier is the photon, and it interacts with anything which has electric charge. Electric charge can be represented by the integers on a single number line and photons themselves carry no electric charge. (a) In the case of the...

I'm a high school student reading through a book on the discovery of the Higgs boson, and, among several other things, there's one part that I don't understand completely. I understand that the Higgs field is what gives mass to lots of particles that would otherwise be the same without the...

In QFT, we can expand the propagator and obtain the diagrammatic expansion to build up the Green's function. If we have a hamiltonian of the type H = H_{0}+V, where V is the perturbation, we can build up the Feynman diagrams,and if we could build up all of them to infinite order, we would...

Homework Statement (a)Draw feynman diagrams of upsilon meson. Why is decay to ##q\bar q## states suppressed? Explain why width for 4s is much wider. (b) How do B mesons decay? Why is no other type of interaction possible? Draw feynman diagrams. (c) Find the distance traveled by 1s and 4s. (d)...

If you consider the ##\chi_0 ## with a mass of ## 3.4 GeV/c^2## meson, why doesn't it decay to a pair of charged leptons? Technically it is possible though the weak interaction (Z boson) or EM interaction, right? Is it because it is so heavily suppressed because the strong interactions are...

Homework Statement (a) Draw the feynman diagram for ##p \bar p \rightarrow## reaction. (b) Find an expression for mass of the particle. (c) Find an expression for number of ##\mu^{+} \mu^{-}## produced. (d) Find an expression of ##n_{jj}## in terms of ##m_{inv}## and its spin. (e) Deduce the...

Homework Statement (a) Explain the results. (b) Why is the cross section much higher? Suggest the dominant decay product pair.[/B] Homework EquationsThe Attempt at a Solution [/B] Part(a) For a centre of mass energy of ##170GeV##, you produce pairs of oppositely charged ##W^{\pm},W^{\mp}##...

The question is for which of the ##1P## meson states - ##1^{1}P_{1}, 1^{3}P_{0},1^{3}P_{1}, 1^{3}P_{2} ## ##D_{s}## states decaying to a ##1S## state is the decay: ##D_{s}**^{+} -> D_{s}^{+}\pi^{0} ## possible? Solution So the strong interaction conserves parity. Parity of meson is given by...

Hi everyone, I have a simple and foolish question. I want to compare the energy of a given mass (obviously e=mc2); let's say the energy of a hydrogen atom, with the energy that binds together the fundamental particles of that atom (strong interaction). I know that e=mc2 holds always true, and...

Dear all, this is my first thread in the forum. I am trying to solve the following problem. it was given during a written exam at my university (many years ago) and I really would appreciate if someone will help me to solve it 1. Homework Statement Show that if the hamiltonian of the strong...

Hello All, I am quiet new to the subject, so if anybody can help me. The four fundamental forces of nature, gravity, strong, weak,electromagnetism. Through weak force, all the electrons, protons and neutrons interact with each other. An attempt was made late in the 20th.century to unify...

Homework Statement Homework Equations This one has confused me, I know that Baryon number has to be conserved so X has to be a baryon. I can see how charge is conserved The Attempt at a Solution I know this is the strong interaction. Is it a collision? Is that where the...

My understanding of colour so far is that if we had, say, a baryon with quark content uuu, we would need to invoke a new quantum number that would allow each quark not to be in the same quantum state to avoid violating the Pauli principle. Now apparently this new quantum number is called colour...

hey, i want to find the lowest order strong interaction feynman diagram for the following process: \Sigma^{++}_c \rightarrow \Lambda^+_c \pi^+ the quark composition is: \Sigma^{++}_c = (c u u) \ \Lambda^+_c = (c u d). \pi^+ =( \bar{d} u ) an image of a correct process is attached...

Gluon is massless particle ,why strong interaction is short-range force?

As we know:Gravitation is attractive force, electric force is attractive and repulsive force. Weak and strong interaction are attractive or repulsive force?

I hope this is the right section for this topic... I'm not a student of physics, I actually study engineering, and there's something I've been wondering for a while. I know - more or less - inside and out two of the four "forces" of the universe: gravity and electromagnetism. However, since I...

the strong interaction's range is 10-15m, but because gluons are massless shouldn't it be infinite? is it something to do w/ confinement?

I am having some difficulty understanding the concept of colour charge. I realize that protons and neutrons are made up of a different number of quarks, and this is how they have the charges +1 and zero. I then realized that different quarks have color charge and that in a hadron (protons...

And would the potential be equal in magnitude yet opposite in sign? If you were to approximate a yukawa potential for some baryon and had it "near" its antiparticle, what would the potential look like. The same for a baryon and another baryon but opposite? This would just be like a...

I have a proton and an antiproton scattering, via a pion exchange. The matrix element has the form: M=g*(\bar{u}_{1}\gamma ^{5}u_{2})\frac {1} {q^2-m^2}( \bar{v}_{1}\gamma ^{5}v_2) Wher g is my coupling constant, and q the 4-momentum of the pion. The problem is that when I compute the...

Hello, Does anyone know why in pionic hydrogen the strong interaction should be attractive whilst in kaonic hydrogen it is repulsive. I have heard it is something to do with a sub-threshold resonance but nothing more. Thanks Sham

In the Residual Strong Interaction, energy and momentum are exchanged not through gluons but through exchange of quarks, for example in the soft hadronic scattering of a pi + and proton. Is the interaction mediated by a single meson or by two quarks, and if the latter doesn't this violate quark...

I have a problem in understanding the dependence by isospin of strong interaction. In this potential one have a lot of operatorial terms which include central, spin-spin, tensor force, spin-orbit terms, and all this four terms multiply by a factor isospin-dependent (tau_i dot tau_j). I don't...

Is there a general equation for the Strong Interaction?

Is there a general equation for the Strong Interaction? Thanks!