Recent content by DMESONS

Thanks for your comment. The integral is convergent for some values of (n) which can be either positive or negative. As I mentioned, if I set b =0, the result have the form of hypergeometric function! But if b is not zero, Mathematica can't solve it.

How can I perform this integral \begin{equation} \int^∞_a dq \frac{1}{(q+b)} (q^2-a^2)^n (q-c)^n ? \end{equation} all parameters are positive (a, b, and c) and n>0. I tried using Mathemtica..but it doesn't work! if we set b to zero, above integral leads to the hypergeometric...

Yes..it is correct...don't forget to show the time follow (for example from bottom to up). Also, you should say if we consider the proton as a fundamental particle then the EM interaction between electron and proton is .. one you posted)

I've no idea about your course structure..but this scattering is known as deep inelastic scattering in which electrons scatter with proton constituents (quarks)..Any way, if your A-level textbook doesn't treat proton as a composite particle then you can consider it as a fundamental particle...

This article has discussed the rare B-meson decay into baryons. http://arxiv.org/abs/1211.1856

Many refs. but for example; http://arxiv.org/abs/1208.6568

I think proton (field) should be considered as external source and denoted by (X) in feynman diagram. The above diagram is valid for scattering of fundamental particles (leptons& quarks)

The combination of special relativity and quantum mechanics in a single framework makes our understanding of such systems to be true only in 4D, Minkowski space...I have noticed that recent published work concerning 2D systems and I am not sure about this reduction of 4D to only 2D, does it mean...

I strongly encourage you reading (Quantum Field Theory in a Nutshell) https://www.amazon.com/dp/0691010196/?tag=pfamazon01-20 It helps you to understand all topics related to QFT

Thank you ..the online edition contains all information

In Particle Data Group booklet, many refined determinations of the masses and decay widths processes are collected and listed in a fabulous way. But it is still (at least for me) to find the sources of these Data, I mean from which experiments, FOCUS, or BELLE..., are taken? is there other...

We know this tiny splitting in degenerate levels in Hydrogen spectrum due to magnetic interactions between spins of electron and proton. but is that true the proton spin is independent of energy in this (hyperfine) splitting? I want to understand the physics of this splitting and how the spin...

Bill_K and Hepth, I am so grateful for your help I am new in this subject :smile:

Can someone help me to expand the following gamma functions around the pole ε, at fisrt order in ε \Gamma[(1/2) \pm (ε/2)] where ε= d-4

Thanks for your concern.