Recent content by shirosato

I suppose wiki has a clear enough answer: In particle physics, a Higgsino, symbol H͂, is the hypothetical superpartner of the Higgs boson, as predicted by supersymmetry. The Higgsino is a Dirac fermion and that is a weak isodoublet with hypercharge half under the Standard Model gauge...

Question 1: I am aware the Higgs lies in a chiral supermultiplet, but I realized I don't have an intuitive idea of i) how many Higgsinos there are (since the MSSM has 2 complex isodoublets) ii) how many Higgsinos there are after EWSB and you gauge away three of the scalar fields iii) their...

Short intro.: I'm a M.Sc. student finishing up a thesis on DM from a HEP aspect. My background in particle physics is ok, but I have had a lot of trouble with the cosmology aspects. Any help would be appreciated since I can't seem to find clear, concise answers for them with references (maybe...

The reference griffiths gives is: http://prola.aps.org/pdf/PR/v105/i4/p1413_1 , which doesn't seem to answer my question, unless I am missing something.

Hello all, This is something that has irked me for a while. The Li/Yang/Wu beta decay showed parity violation in the weak force, but from what I gather, it was the helicities of the electrons they measured, while it is the chiral states which are important. For a massive fermion, aren't the...

I believe the reason why we can't ignore them in quantum is because we need our Hilbert space to be complete, which throwing away negative-energy solutions would mess with.

So since I learning QFT a while ago, I've always struggled to understand fermions. I can do computations, but I feel at some level, something fundamental is missing in my understanding. The spinors encountered in QFT develop a lot from "objects that transform under the fundamental representation...

Hello all. Again, thank you for the help so far. Forgive the lack of tex in this post, it somehow was creating errors no matter what I tried. My question this time involves understanding the F and D terms in SUSY theories. From what I understood, they were introduced as auxiliary fields (EOM...

Thank you. Those answered clarified things quite a bit and I even agree quite a bit with your answer to question 6. I'm a 2nd year grad student in BSM pheno and am starting to realize 1) the large variance in knowledge over the range of topics in HEP theory among professional theorists 2) the...

..and a toast to you too. Hopefully in a few years, we'll be amazed once more.

So, I've been tasked to learn SUSY in a small time span (few weeks) and I've made some progress but I'm a little stumped on how deeply I should go into things while still making reasonable progress (get to phenomenology, etc). First of all, most primers seem to gloss over the algebra or go...

Thanks for the reply, it cleared things up a lot. Coincidentally, I believe you wrote a math primer I used when I first took QFT. See, that's what I never understood too well; the Hierarchy Problem stated as you stated it (as I often see it). Why is that unnatural? To me it seems equivalent to...

hey, I learned from Luke the first time too!

First of all, thank you to those who have helped me with questions; its been helpful and this forum is proving to be a useful learning device. This time, I'm just looking for some clarification. From what I understand, the 'Hierarchy Problem' lies in the self-energy corrections to the Higgs...

Thank you, that was pretty helpful. But what about the fundamental representation? I know its a bit odd to ask, but is there any physical intuition about any of this or some basic insight to how this was all deduced?