Hi there,
There has been 2 questions that bother me and couldn't find a good answer to them. Maybe some experts out there could help?
Question 1:
It is said that the representation of photon spin-up is
-(1/Sqrt(2)) (1, i, 0)
And the representation of photon spin-down is
(1/Sqrt(2))...
Hi,
I've just read Griffiths...and I've heard Martin's text is roughly at about the same level as Griffiths. I think I'm ready to go a step higher now and I'd like to learn QFT in a semi-formal sense.
I did some research about the book by Peskin/Schroeder. At amazon.com, it doesn't seem...
Hi all,
I am wondering if anyone out there could give your recommendation as to what my first QFT book should be considering that I'm an experimentalist interested in particle physics.
Having said that, obviously the goal is to quickly understand the "derivations" of Feynman rules and be...
Hi there,
I almost cried when I found your post at physics forum! I'm a grad student from UC Berkeley currently trying to teach myself string theory. I'd appreciate if you can send me the solution to Zwiebach's text.
My email is:
joechien0218@yahoo.com
By the way, as far as I know...
Oh Hi Meir again, sorry to bother you again ...
you've mentioned that the original paper that talks about baryon mass estimation is found in Physics review. I tried finding it yesterday and failed. I'd like to take a look at it. Do you have it? Would you mind sending it to me?
My email...
Hi Meir, thanks for the response again...I kind of know what you mean...
One more question though, when you said "The Xi total spin 1/2 wave function is (ssu)[2aab-aba-baa]/sqrt{6}", how did you obtaint his result?
Here's what I think:
Xi is a spin 1/2 particle and one should use EQ...
Hi Meir,
For lambda, the two nucleon quarks are in spin zero state, but Why?
You've mentioned in the previous post that "one can show that the probability is higher if the nucleons in lambda are in spin zero state". How were you able to conclude that?
thx
joe
Hi! Thanks for the lightning response!
Actually when I created that thread, I was just trying to understand what Griffiths's saying on page 183, namely how he was able to conclude that
For sigma, (Su+Sd)^2 = 2 h h (EQ 5.129)
For lambda, (Su+Sd)^2 = 0 (EQ...
Hi All,
I'm wondering what the difference is between flavor and isospin.
If you own a book by Griffiths titled Elementary Particles, on page 183 in the paragraph above EQ 5.129, he mentions isospin and spin together and the former seems to imply the latter.
Does anyone out there know...
Achuz said, "The difficulty comes for two different quarks (like s-d).
Then their spin addition can give 1 or 0. For spin zero, s1.s2=-3/4.
YOu can show that the s-d pair has probability 1/4 of being in the spin one state and probabilty 3/4 of being in the spin zero state."
Why do you say...