Recent content by rjseen

An assumption in deducing the Bethe equation is that the momentum transfer is perpendicular to the direction of the particle. ALSO In Allison & Cobb (1980), just after eq. 28, they state that the first two terms of the Photoabsorption Ionization model arise from the magnetic vector potential...

Hi, so I have the spatial distributions of detected hits in figure 1. When plotting fig 1 as a regular scatter plot I thought I could discern some sort of pattern. So I got the idea of taking its Fourier transform and to see the result of the analysis. I am not very well acquainted with the...

Hi! It is all about hard work and dedication and it's never too late to start! For myself the math was a necessary evil, but after having gone through it I started finding itself a very interesting subject. The main difference between high school and college math would be the emphasis on...

So I have been thinking a little more about the problem I had and I'd like to share it for future reference. The missing mass squared we define using the 4-momenta P as (Pπ-PK)2 where we investigate it under a so called π+ hypothesis, meaning we assume the mass of the particle we detected is...

O nevermind I figured it out :) I was completely disregarding how I calculated the missing mass. They are of course bounded by 0.122 GeV2=(m(K+)-m(pion))^2, or simply the mass that's missing compared to the assumed mass.

I am assuming you are referring to decays and interactions between particles. A beta decay is one involving the weak interaction, as I see ChrisVer also mentioned. This huge document from the Particle Data Group (1600 pages) has information on pretty much everything in the standard model...

Hi, so for example in the figure below the missing mass squared has been calculated under the assumption of the detection of a pi+ particle decaying from a K+. What I am wondering is what is it that's bounding all the decays at 0.122 GeV2? And for the decays at all, what is e.g. bounding the...

Thank you for your replies! And especial thank you to Vanhees for those links. The one at scholarpedia is really well written for rudimentary understanding. For future browsers I can try and conclude (or be corrected!): -There are no Flavor-Changing Neutral Currents (FCNC) in the Tree level...

Thanks for the quick answer. I have come across that explanation in various theses, so that's apparently the real thing I have to understand in this. So, I have understood that the K⁺ -> π⁺ ν ν-bar is called an FCNC, is the flavor part because of the strange anti-quark ending up as a down...

Hello, my question is, why does the decay of K⁺ -> π⁺ ν ν-bar require a loop to be allowed. See images below.* -What is it that makes the decay forbidden in figure 1.4 and not forbidden in figure 1.5? -What does being a first order weak decay and a second order weak decay mean? -I suspect...