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Feb2313 08:41 AM
ZapperZ

1 
20,991 
God particle is 'found': Scientists at Cern expected to announce on Wednesday Higgs boson particle has been discovered...

Jul1112 01:13 AM
tom.stoer

178 
34,135 
I'm studying the \tau \rightarrow \rho \; \nu_{\tau} decay. I'm asked to calculate the decay width, using a...

Jun2113 08:37 AM
GWSguy

2 
1,233 
Does anyone know of a site that lists particle half life times, all in one place?

Jun2113 12:36 AM
Haborix

1 
708 
I could only find abstracts for proposals of methods that could accomplish this. I don't have any subscriptions to...

Jun2013 05:26 PM
mfb

2 
809 
The leptons and hadrons carry the weak isospin charge. What allows the weak bosons do carry the charge? Is it because...

Jun2013 03:47 PM
AlephClo

7 
883 
Hello everybody, I am a first year physics student and I have a question about the probability for 'heavy' nucleus to...

Jun1913 09:53 AM
Bill_K

1 
767 
http://news.discovery.com/space/quirky4quarkquantummonstediscovered130618.htm
Do you think this is legit? How...

Jun1913 04:07 AM
mfb

2 
1,159 
can anybody help me to derive eqn. (9.19) of Srednicki's QFT book?

Jun1813 06:40 PM
Haborix

3 
769 
Hi,
I don't know very much about the weak force, but gravity, EM and the strong force all seem to apply an actual F...

Jun1813 12:48 PM
Vanadium 50

13 
1,130 
So I have a bit of a story here. First of all, I work in my university's radiation safety department, where, among...

Jun1813 03:16 AM
mfb

2 
809 
Hi,
I'm trying to calculate the matrix element for the process g*q>q.
I can't find the formula for polarization sum...

Jun1713 01:18 PM
chamster

0 
600 
http://www.eurekalert.org/pub_releases/201306/vustm061013.php
http://arxiv.org/abs/1211.0503
Anapole Dark Matter...

Jun1713 12:56 PM
Mordred

5 
884 
Hello guys.
I am studying the experiment conducted by Chamberlain, Segrč, Wiegand and Ypsilantis in 1955 at Berkeley...

Jun1713 06:23 AM
Bill_K

10 
937 
Hello everybody! :shy:
What is the strength of the strong force between, for instance, a proton and a neutron...

Jun1513 06:09 PM
HakimPhilo

11 
1,007 
I'm in undergrad doing research with a professor. He's leaving for vacation for a few weeks, and has tasked me with a...

Jun1413 11:01 PM
eigenstaytes

0 
620 
How can I prove by using the Lagrangian of some gauge theory (GWS say) that the vertex ##f \rightarrow f \gamma ##,...

Jun1413 08:46 PM
LayMuon

0 
582 
Hi Everyone.
In the Resonaances blog, I recall that it was mentioned there that the particle physics group at CERN...

Jun1413 08:44 AM
mfb

2 
796 
I can't seem to find one, but does anyone have a reference to the fourvector polarizations for a massive vector...

Jun1313 12:43 PM
Hepth

0 
596 
Greetings to all
I had some problems using MCNP5 for gamma shielding calculation. The original input file is from a...

Jun1213 09:31 AM
damyoro

13 
2,430 
I know the trace tr in 4dimensional spacetime, how is the result of it in D dimension? Is it the same as in 4...

Jun1213 08:32 AM
andrien

1 
773 
In case I'm wrong, the formula for energy of a photon is E=hf.
Or E=hc/λ, because f=c/λ.
Basically the second...

Jun1213 07:41 AM
Aspchizo

3 
1,570 
I am studying QFT from Srednicki's book. Let me ask a question about symmetry factor from this book.
Let, for...

Jun1213 12:27 AM
omephy

0 
697 
I am learning QFT from Srednicki's book.
However, in Figure 9.2 Srednicki has given all connected diagrams with E=0...

Jun1113 04:38 PM
Bill_K

3 
728 
The Z0 is a linear combination of W0 and B0 bosons, so unlike the charged current interaction it can interact with...

Jun1013 01:07 PM
bayners123

2 
622 
Hi all,
If I take an action involving two point particles coupled together by a delta function contact interaction...

Jun813 03:09 PM
Illuminatum

2 
780 
I am no expert on this stuff, so please forgive any errors.
I've read some Feynman and seen his diagrams showing a...

Jun713 03:29 AM
mpv_plate

7 
1,113 
Greeting people of Physics,
Why are the laws of physics not symmetrical between left and right, future and past,...

Jun713 01:55 AM
AlfieD

13 
1,346 
Quick, probably obvious, question. If there was equal amounts of matter and antimatter and they collided and exploded,...

Jun513 03:32 PM
mfb

3 
663 
Could anybody explain why neutrinos have only ever been observed to be lefthanded and antineutrinos righthanded? If...

Jun513 07:27 AM
Bill_K

7 
905 
(PS: this post was also posted at the quantum mechanics/field theory forum, but I did not get any replies there)
...

Jun513 03:30 AM
andrien

2 
763 
why without the higgs boson, would partical physics be nonsense. why does this particle have such an important impact...

Jun413 09:25 AM
llynne

6 
1,325 
I've been thinking about dark matter, WIMPs and neutrinos, and why these particles would not interact with matter...

Jun413 08:45 AM
llynne

5 
1,229 
Does anyone have any good technical papers covering the Majorana particle?
...

Jun313 04:48 PM
Mordred

2 
600 
Does anyone have a reference for the details of energy and byproducts produced in an annihilation reaction of a...

Jun213 09:20 AM
mfb

1 
763 
Hello,
I am opening this thread so as to discuss if possible what you believe is the science case of building a...

Jun113 07:29 PM
e.chaniotakis

7 
763 
Hi, I have always wondered, is there a known formula that predicts the half life of an atom based on known values...

May3113 01:33 PM
Bill_K

2 
703 
Dear Physics Forum,
I was thinking about the properties of the combined electroweak force. Does it maintain the ...

May3113 03:43 AM
mpv_plate

2 
711 
I've PMd some of you with this question, but I got some conflicting replies or no replies at all lol, so I'm posting...

May3013 02:31 PM
The_Duck

4 
835 
Has the experiment been done to drop antimatter and see if it falls the same speed as regular matter? I seem to have...

May2913 01:39 PM
DrClaude

2 
784 
I have been interested in how they can be made in large amounts. If you could post the energy and projectile particle...

May2813 02:49 PM
mfb

1 
714 
\pi^0s decay to two photons via the EM interaction. The J^{PC} of the pion is 0^{+} and of a \gamma is 1^{}. ...

May2813 06:19 AM
bayners123

7 
848 