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High Energy, Nuclear, Particle Physics

- Properties, relationships, and interactions of subatomic particles. Exp. & theo. physics of nuclei & elementary particles
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Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Feb23-13 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...
Jul11-12 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...
Mar9-14 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...
Apr10-14 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? ...
Apr20-14 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...
Mar21-11 07:20 AM
ZapperZ
20 2,630
hello there! your help is really appreciated. 1.For the Ruther alpha-particle scattering experiment, how come we...
Oct3-10 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...
Jan26-10 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...
Jan13-10 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 ->...
Dec2-10 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...
Mar2-11 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....
Dec5-11 12:33 PM
Parlyne
4 1,816
I've been told that the (thermally averaged) cross section for this process: ...
Dec12-11 03:41 PM
ryanwilk
0 1,349
Hi, this is probably very simple but what is the difference between these two Feynman propagators: ...
Jan11-12 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...
Mar8-12 03:12 AM
ofirg
1 977
Hi, quick question. "In electroweak theory, the neutrino belongs to an SU(2) doublet" So, does the neutrino...
Apr15-12 10:25 PM
The_Duck
2 1,310
Hi, Quick question. In the SM, why can't we have loop-level interactions that give neutrinos their small masses?...
Apr16-12 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...
Sep6-13 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...
Feb7-14 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...
Jun8-12 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...
Mar25-11 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...
Jan11-08 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...
Nov7-12 08:26 AM
ofirg
3 782
I need to know the applications of nuclear fusion, Is there anybody who could help?
Mar8-06 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...
Nov13-11 04:19 AM
Sada
0 1,302
One of the aims of the Large Hadron Collider is that it may be able to re-create conditions in the early universe and...
Oct7-11 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,
Mar9-13 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...
Apr13-13 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 . ...
Aug3-13 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...
Sep10-13 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 ...
Oct20-13 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. ...
Nov17-13 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...
Nov22-13 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...
Dec9-13 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,...
Nov24-13 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...
Nov25-13 08:04 AM
Safinaz
0 522
Hi all, I'd like to know what is the integrated luminosity of CMS exp. Cern ? Best, S.
Dec3-13 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 >...
Dec6-13 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...
Jan3-14 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...
Jan28-14 11:32 PM
Safinaz
3 890
Hi all, I'd like to know how the chiral symmetry protect the electron mass in the one-loop calculation of the...
Apr16-14 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

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