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Feb2313 08:41 AM
ZapperZ

1 
21,122 
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 
34,692 
Hi,
Given the initial energy of a pion is it possible to calculate the probability and mode of its decay?
Ive...

Mar914 05:22 AM
ChrisVer

8 
584 
Hi, I'm in the process of revision for upcoming exams, one likely question will give a number of decays (~5) and ask...

Apr1014 06:37 AM
rwooduk

6 
383 
Ive attached the R ratio formula to this post, please could someone who is familiar with it tell me what Nc is?
...

Apr2014 04:19 PM
mfb

5 
242 
I'm wondering who out there believes a Higgs field exists, and why you do/don't believe that? It seems like an aether...

Mar2111 07:20 AM
ZapperZ

20 
2,630 
hello there! your help is really appreciated.
1.For the Ruther alphaparticle scattering experiment, how come we...

Oct310 01:07 PM
Parlyne

2 
990 
Hi,
I'm doing an essay on the Higgs boson and I'm confused about what the "four degrees of freedom" of the Higgs...

Jan2610 08:58 AM
HarryDaniels

13 
2,537 
Hi,
In particle physics, what does 'coupling' mean? I can't find a definition anywhere and books just assume you...

Jan1310 10:07 AM
blechman

1 
2,392 
Hi, I'm currently producing an undergraduate poster on CP violation and I have a few questions:
 Was K0 >...

Dec210 04:43 PM
ryanwilk

4 
1,175 
Hi, I'm currently carrying out a computer project on resonant scattering and I need to find literature values for the...

Mar211 04:30 PM
ryanwilk

0 
1,029 
The Dirac propagator (e.g. for an electron) is given by the inverse of the field equation in momentum space i.e....

Dec511 12:33 PM
Parlyne

4 
1,816 
I've been told that the (thermally averaged) cross section for this process:
...

Dec1211 03:41 PM
ryanwilk

0 
1,349 
Hi, this is probably very simple but what is the difference between these two Feynman propagators:
...

Jan1112 02:03 PM
ryanwilk

2 
1,107 
Hi, this is probably very simple.
1) What is the product of two singlets?
2) What is the product of two singlets...

Mar812 03:12 AM
ofirg

1 
977 
Hi, quick question.
"In electroweak theory, the neutrino belongs to an SU(2) doublet"
So, does the neutrino...

Apr1512 10:25 PM
The_Duck

2 
1,310 
Hi,
Quick question. In the SM, why can't we have looplevel interactions that give neutrinos their small masses?...

Apr1612 09:48 PM
Parlyne

1 
1,069 
Hi, this is probably pretty simple but it's puzzling me...
In neutrino oscillation, you produce and detect...

Sep613 07:12 PM
mfb

1 
934 
I have a very lamans understanding of particle accelerators, one of the things I gather is that their large size...

Feb714 06:54 PM
mfb

5 
638 
Hello all, I was just wondering if anyone could give me links to any websites that allow any one to post their own...

Jun812 02:25 AM
s.tovell

2 
1,127 
When more matter collides with less antimatter, is all of the antimatter and matter destroyed, or just equivalent...

Mar2511 08:13 PM
daumphys

22 
3,957 
Because of the existence of sterile neutrino, how and why it gives effect on the big bang nucleosynthesis more than...

Jan1108 04:10 PM
ZapperZ

3 
2,138 
i would like to ask a few questions about Neutrino oscillation
1) How can i calculate/obtain the mass eigenstates...

Nov712 08:26 AM
ofirg

3 
782 
I need to know the applications of nuclear fusion, Is there anybody who could help?

Mar806 06:41 AM
Astronuc

7 
2,019 
Hi all,
Can any one suggest me a nice topic for radioactive control of composite materials using low energy photons...

Nov1311 04:19 AM
Sada

0 
1,302 
One of the aims of the Large Hadron Collider is that it may be able to recreate conditions in the early universe and...

Oct711 04:12 AM
Saddlestone

3 
1,326 
Hi,
How can I calculate such terms
d^Aae d^ebD f^AaE f^EbD
d^Aae d^EbD f^AaE f^ebD
Cheers,

Mar913 05:45 AM
andrien

3 
902 
Hi all,
Has any one know how to calculate the loop function of Higgs decay to photons/ gluons by t quark , or a...

Apr1313 04:53 PM
Safinaz

4 
708 
Hi all,
I try to calculate the Higgs production cross section by Mathematica using
for example the formula in .
...

Aug313 04:36 AM
Safinaz

6 
1,109 
Hi all,
I'm not so expert in C++, but I try to make a a simple program to calculate
and plot the ttbar pair mass...

Sep1013 01:08 PM
Safinaz

4 
1,009 
Hi all,
I'd like to more understand what is the difference between when we draw the differential cross section
...

Oct2013 04:24 AM
Safinaz

0 
619 
Hi all,
Do any one know what is the spin correlation and what its relation to theNarrow Width Approximation.
...

Nov1713 04:11 PM
RGevo

1 
646 
Hi all,
I try to understand the difference which can made by using or not using NWA ..
I have a process have...

Nov2213 02:09 PM
Safinaz

2 
543 
Hi all,
I'd like to know what if we have a scatteing process A+B > C > E+D,
what is the relation between the width...

Dec913 12:43 PM
RGevo

4 
926 
Hi all,
why in SUSY we tend to use 2 components Weyl spinor field
not the ordinary Dirac filed ..
Regards,...

Nov2413 11:47 AM
dauto

3 
629 
Hi all,
Let me ask about what is meant that
Narrow width approximation has an error ~ ## \Gamma/m ##, is it mean...

Nov2513 08:04 AM
Safinaz

0 
522 
Hi all,
I'd like to know what is the integrated luminosity of CMS exp. Cern ?
Best,
S.

Dec313 12:39 PM
mfb

5 
694 
Hi all,
Could any one help for calculating the hadronc production cross section for example for
tree level : p p >...

Dec613 09:13 AM
ChrisVer

1 
881 
Hi all,
Is it not preferable to detect a particle at the LHC with final states of photons, that when I read
in...

Jan314 04:34 PM
mfb

1 
708 
Hi all,
There is a CMS (Cern) program in which can display similar to the attached figures, do any
one know what...

Jan2814 11:32 PM
Safinaz

3 
890 
Hi all,
I'd like to know how the chiral symmetry protect the electron mass in the oneloop calculation of the...

Apr1614 10:09 AM
andrien

1 
304 
Hi all,
I think that the off shell decay dosn't decrease the decay cross section, I mean if a particle X
decays...

T 01:31 PM
mfb

1 
165 