
God particle is 'found': Scientists at Cern expected to announce on Wednesday Higgs boson particle has been discovered...

Jul1814 12:32 PM
ChrisVer

187 
62,493 
Before posting anything, please review the Physics Forums Global Guidelines.
If you are seeking help with a...

Feb2313 08:41 AM
ZapperZ

1 
25,932 
Just wondering whether there's any interaction, where the tchannel is prohibited, only the schannel ?

Jun408 05:17 PM
Timo

1 
1,456 
What is the definition of lightcone gauge? Is there any advantage for working in this gauge?

Jun308 12:57 AM
VanLoon

3 
3,184 
Hi, Does anyone know how to calculate this quantity: <DeltaH_i(0)*DeltaH_j(t)>/<DeltaH_i(0)*DeltaH_i(0)>, where...

Jun208 07:14 PM
unica

0 
1,800 
Please take a look at the file "Feynman.pdf". The ratio rate for the two decays is shown in the second file,...

Jun208 09:42 AM
vertices

3 
1,343 
Is weak interaction invaraint under CPT Symmetry? Why?

Jun208 05:21 AM
Haelfix

3 
1,652 
I was reading a NY Times article on the lawsuit filed by Wagner and Sancho and amongst the usual doomsday predictions...

Jun108 10:25 AM
GeorgeVT

5 
2,096 
Is there a general dependence of some physical quantities for the decay width of any particles?

May3108 02:12 PM
vertices

1 
6,689 
This is a known fact that CKM matrix, a matrix that is used to connect the weak interaction eigenstates to mass...

May3008 06:41 AM
Atakor

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3,338 
Dear All,
I've some confusion/doubt and want to clear those :smile: . They are following,
1....

May2908 08:52 AM
ikku

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2,322 
I attach a solution to a problem. I don't understand the highlighted bit:
I mean, firstly why can we assume that qc...

May2908 08:23 AM
vertices

5 
1,816 
hi,
I want to change the date to my old genie2k .cnf file.
Any suggestion?

May2908 02:57 AM
malawi_glenn

2 
1,452 
i was thinking about propagators, and I've got bit of a silly question.
The amplitude for any given decay takes the...

May2808 10:46 PM
vertices

9 
2,151 
The Higgs mechanism can give gauge bosons mass. However, in the electroweak theory, only W and Z get masses, not the...

May2808 05:58 PM
arivero

13 
5,101 
Hello !
I will probably start a phd thesis about neutrinos (theoretical/phenomenological aspect) on october ...
I...

May2808 08:41 AM
malawi_glenn

9 
2,001 
Hi, just curious because I don't have it in my notes, say for fixed A (Atomic Number) we have Z_s which is the proton...

May2708 01:12 AM
malawi_glenn

1 
1,223 
Please look at the attach file.
If we take case a) it proves the C and P are independly violated (neutrinos are...

May2608 05:29 PM
vertices

4 
1,477 
I have just read, in general, weak interactions, have the lowest Q values; meaning they have the smallest cross...

May2608 02:24 PM
philip041

2 
1,727 
I understand the following:
The cross section \frac{d\sigma}{d(cos \theta )} (e^+e^ \rightarrow \mu^+ \mu^)...

May2508 04:51 PM
neu

8 
2,253 
I'm confused about how parities 'add up'.
(I'm using the shell model of a nucleus)
If you have e.g.a neutron in a d...

May2508 03:07 PM
malawi_glenn

3 
1,525 
Suppose there's an interaction AB > CD, that goes via a virtual W boson, my question is, will the virtual boson...

May2308 06:50 PM
touqra

3 
1,980 
Hello.
I was wondering what's the purpose of using Thallium (Tl) in Iodine Sodium (NaI) scintillators.

May2308 04:43 PM
Ed Aboud

1 
1,232 
Hey!
Virtual particles appear and annihilate all over the universe.
If a pair is created just on a black hole event...

May2308 09:23 AM
humanino

3 
1,385 
basically, what is it?
also, is there such a thing as "colour change"?
ahh, i have PHY3 tomorrow i can't believe i...

May2208 05:38 PM
arivero

5 
3,903 
Hi,
I'm trying to cover the basics of Cabibbo theory, yet the materials Ive been presented with give a very...

May2208 03:29 AM
Barny

2 
2,536 
Hi everybody!
While reading PeskinSchroeder, i stuck in the in equation 5.4 about the unpolarized cross section of...

May2208 01:36 AM
malawi_glenn

19 
3,324 
Hello!
I hear an elementary particle course and I wonder about one question: There is the multiplett of \pi^+,...

May2108 08:23 PM
pam

4 
1,972 
Quick question, regarding massenergy equivalence (e=mc2) and matter creation.
Knowing that there are many concete...

May2108 01:54 PM
malawi_glenn

30 
19,216 
I'm interested in hearing from the experts (practicing physicists and teachers) here about what you think of the...

May2108 12:24 PM
lzkelley

16 
3,760 
Please correct anything i have wrong, im not a physics guy :). So my skills are lacking.
Say i have two points a...

May2108 11:53 AM
m3the01

0 
1,626 
hi  I'm stuck on a question...
use the graph to calculate the binding energy of uranium 235 nucleus:
the graph...

May2108 11:19 AM
funnybunny

3 
4,135 
why is the cross section of photon  proton less than the electron photon cross section for the same photon energy??

May2008 05:10 PM
daschaich

5 
3,938 
I don't know where this should go or who is interested.
http://lanl.arxiv.org/abs/0804.2021
Parton fragmentation in...

May2008 04:53 PM
jal

11 
2,265 
How come that higgs boson hasn't been found yet? According to wikipedia,The nonobservation of clear signals leads to...

May2008 04:20 PM
daschaich

10 
4,235 
According to contemporary ideas the spin of elementary particle is a certain mysterious inner moment of impulse for...

May1908 09:44 PM
gorgos

9 
1,478 
Can someone please explain me with what and how antimatter is created.
thanks!

May1908 03:11 AM
malawi_glenn

1 
1,264 
When electrons collide with positrons, we get gammarays and other particles. Keeping in mind E=mc^2, is the result...

May1908 03:04 AM
malawi_glenn

25 
3,038 
I am inquiring if anyone here is qualified to numerically demonstrate the solution to this equation?
The equation...

May1808 09:41 AM
Orion1

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2,172 
Feynman wrote: "Throughout this entire story there remains one especially unsatisfactory features: the observed...

May1808 05:37 AM
cristo

30 
5,447 
I'm doing some research on the history of particle physics from 19471964, and have been completely unable to find an...

May1708 07:39 PM
pam

2 
1,974 
Can someone provide some help with a derivation in Peskin and Schroeder (equation 4.126, p.122):
V(\bold{x}) =...

May1708 02:01 PM
malawi_glenn

1 
5,855 