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Feb2313 08:41 AM
ZapperZ

1 
21,109 
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 
34,660 
Hello.
When you have a plot of the cross section in function of the centre of mass energy of an e+e > hadrons...

Jul813 06:20 PM
mfb

5 
1,027 
Why is it necessary to use Monte Carlo methods in high energy physics?
There is Feynman calculus to evaluate matrix...

Jul713 03:43 PM
RGevo

2 
799 
I had a look at the production cross sections for W/Z at hadron colliders. These differ as a function of energy with...

Jul513 12:06 PM
Vanadium 50

2 
821 
Hello everybody! :wink:
I have some difficulties concerning the concept of nuclear binding energy.
First, look at...

Jul513 05:46 AM
Bill_K

6 
1,253 
Hello, everybody:
I have (what I think is) a silly question. We all know that μ and τ particles are just as...

Jul413 10:25 AM
MManuel Abad

3 
810 
i've been researching photons and i discovered on
http://http://van.physics.uiuc.edu/qa/listing.php?id=414
and ...

Jul313 07:51 AM
ZapperZ

42 
17,170 
The Fitch and Cronin experiment is put forward as one of the very few examples of CP violation in weak interactions...

Jul213 11:22 AM
Bill_K

1 
789 
I have a question.
From this government reference:
http://www.ncnr.nist.gov/resources/nlengths/
the...

Jul113 10:14 AM
Salman2

9 
1,310 
Can anyone help me with an approximate answer to this or point me in the direction of avenues to get an answer to...

Jun2813 12:05 PM
Vanadium 50

17 
1,667 
So I'm intending to teach myself some Particle Physics and Standard Model type stuff, I was wondering if someone who's...

Jun2713 03:04 PM
dkotschessaa

1 
913 
Hi all. I have a question. What is the behaviour of the polarization vector of a pseudoscalar particle under a parity...

Jun2713 01:47 AM
Einj

8 
871 
Does anybody understand this theory? Would this be the way of implementing it?
Step 1.) Use DimReg to set the...

Jun2613 11:19 PM
Jim Kata

0 
683 
I am reading Mohapatra's book: "Massive Neutrinos in Physics and Astrophysics". At the beginning of chapter 7, it is...

Jun2613 02:21 PM
lalo_u

4 
870 
Hi,
I have a question regarding the possibilities of analyzing the activity of Ra226 in a sample from a collected...

Jun2513 12:33 PM
mfb

3 
1,069 
I'm trying to understand the process that destroys particles very shortly after they "appear". I have read that they...

Jun2213 02:44 PM
mfb

12 
1,462 
Hello everybody, I am a first year physics student and I have a question about neutrinos and antineutrinos.
In a...

Jun2113 04:47 PM
IsometricPion

3 
870 
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 
1,246 
Does anyone know of a site that lists particle half life times, all in one place?

Jun2113 12:36 AM
Haborix

1 
716 
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 
820 
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 
892 
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 
773 
http://news.discovery.com/space/quirky4quarkquantummonstediscovered130618.htm
Do you think this is legit? How...

Jun1913 04:07 AM
mfb

2 
1,165 
can anybody help me to derive eqn. (9.19) of Srednicki's QFT book?

Jun1813 06:40 PM
Haborix

3 
774 
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 
1,136 
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 
822 
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 
606 
http://www.eurekalert.org/pub_releases/201306/vustm061013.php
http://arxiv.org/abs/1211.0503
Anapole Dark Matter...

Jun1713 12:56 PM
Mordred

5 
893 
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 
946 
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 
1,019 
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 
626 
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 
590 
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 
801 
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 
606 
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 
2,459 
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 
786 
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 
1,608 
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 
710 
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 
740 
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 
631 
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 
788 