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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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Jan16-12 Greg Bernhardt
rules Sticky Thread Pinned: Forum Rules
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Feb23-13 08:41 AM
ZapperZ
1 24,159
God particle is 'found': Scientists at Cern expected to announce on Wednesday Higgs boson particle has been discovered...
Jul18-14 12:32 PM
ChrisVer
187 51,594
Hi everyone... I have answered already a lot of questions here on the topic of the different elementary particles...
Jun19-09 10:48 AM
malawi_glenn
73 70,115
what is the physical meaning of the scattering length of neutrons? What does mean -ve scattering length( for instance...
May21-09 06:15 AM
Vanadium 50
6 13,234
I have the following contour integral form of Wick's theorem (C indicating contraction): C=\frac{1}{2 \pi i} \int...
May31-09 07:03 PM
Super_Leunam
1 4,305
In Standard Model, we have 19 free parameters: me Electron mass 511 keV mμ Muon mass 106 MeV mτ Tauon mass ...
Jun12-09 09:40 AM
ophase
3 2,512
Quick question. If particles that mediate interactions are called gauge bosons, why isn't Pion considered a gauge...
Jun2-09 05:13 PM
blechman
8 2,302
Dear experts, Does renormalization mean discarding corrections to a known constant? I mean, we assign a known...
Jun18-09 03:40 PM
Bob_for_short
36 7,019
I am facing a dilemma which leaves me quite puzzled. I hope someone can straighten this out. The short version is...
May20-09 06:31 PM
RedX
13 4,137
Hey. I was wondering, can we 'see' antimatter? By this, I mean, does a positron ever emit photons, or can we shine a...
May25-09 07:34 AM
malawi_glenn
23 2,888
I have been researching about fusion power to understand how it operates during thermonuclear reactions. I do not...
May24-09 05:20 PM
ozgurakkas
5 1,408
I have a few questions about this. My understanding is this: In the canonical approach to QFT there is an ambiguity...
May20-09 02:06 AM
Bobhawke
5 1,487
Hey all, My year 13 physics students stumped me with this one: Why don't Neutron-Neutron (or P-P for that matter)...
May21-09 12:29 AM
Hepth
2 1,429
I was going through an article on antiparticles: http://www.statemaster.com/encyclopedia/Antiparticles The article...
May24-09 04:12 PM
malawi_glenn
15 2,241
I've been searching online and in my qft books (im an early phd student) and I can't find a clear explanation. If you...
May26-09 08:07 PM
nrqed
7 1,773
I've been wondering, Iron has the most binding energy per nucleon amongst elements and thus realized to be the most...
May22-09 10:02 AM
coverme
4 2,040
The nuclear shell model is based on the shell model for electrons, and in the electron shell model, lasing is possible...
May23-09 07:04 AM
Bob_for_short
1 1,189
http://en.wikipedia.org/wiki/Mirror_matter "In physics, mirror matter, also called shadow matter or Alice matter,...
May24-09 11:29 PM
ensabah6
0 3,195
Hello! What do we mean when we say a particle in on shell? What is off shell? I gather it is related to energy and...
May25-09 02:41 AM
ylem
4 2,660
In my physics class my teacher said that a meson is made up of one quark and one anti-quark. But when, for example,...
May25-09 06:12 PM
xepma
5 1,228
Can we use this tool for computing cross-section?
May26-09 10:25 AM
piggy1983
0 1,028
To my understanding this is an electron in the K-Shell being absorbed by the the nucleus and along with a proton...
Jun3-09 07:19 AM
quZz
14 2,243
I am reading a book (Di Francesco's "CFT", pg 337) in which it is given that if we take the operator that translates...
Jun14-09 12:38 PM
Avodyne
2 3,589
Can someone please tell me the history of high-energy electron-positron collisions? In specific when was it...
Jun2-09 04:01 PM
dseabroo
12 1,979
I have a few questions: 1) The tensor product of two matrices is define by A \otimes B =\left(...
Jun2-09 02:55 AM
Bobhawke
4 1,758
For SU(2) rotational invariance there is a clear interpretation of what all the generators mean. They correspond to...
May31-09 03:27 AM
Bobhawke
0 1,062
I was reading about AdS/CFT and its possible description of superconductors. It is said that superconductors may...
Jun2-09 01:29 PM
Bob_for_short
6 3,368
Question: Does the dimensionless quantity derived from the constants below have any physical meaning? ...
Jun9-09 02:32 PM
Krakers
8 1,399
I'm looking for a probability plot for the beam target D-D & D-T reaction versus deuteron energy. I can calculate the...
Jun5-09 09:12 AM
jnavarros
0 962
What is Universal weak coupling hypothesis?
Jun11-09 04:25 AM
malawi_glenn
2 1,736
i am a student working on theoretical atomic, molecular, optical physics i now need to know some techniques in...
Jun8-09 10:18 AM
malawi_glenn
3 1,606
assume that we have N spin-1 bosons all on the same spatial orbit. The problem is that what values the total...
Jun9-09 10:10 PM
Avodyne
6 1,664
Hi there! The experiment: I'm counting Gamma and beta rays emitted from gamma and beta cylindrical sources, for...
Jun15-09 08:04 AM
EsPg
10 2,946
If I have a theory... some Lagrangian and I need to impose a gauge condition... what is more preferable 1) The...
Jun8-09 03:07 PM
Neitrino
0 678
An understandable explanation please.
Jun15-09 12:15 PM
Max™
21 3,049
Hi. I'm doing some jobs about hadron physics, and i have a question now. How can i make a three body phase space...
Jun10-09 08:10 AM
Harry Potter
0 2,241
Would anyone care to explain this equation/model to me? Here is the link:...
Jun10-09 03:32 PM
malawi_glenn
3 1,006
Suppose an antimatter at lower energy(K.E) collides with a matter in higher energy then what will be the output.
Jun12-09 01:45 PM
malawi_glenn
1 967
Can antimatter(positron) can be converted into a matter(electron) . If yes what other particles are created in that...
Jun12-09 03:54 PM
Bob S
1 860
Gluon is massless particle ,why strong interaction is short-range force?
Jun16-09 11:36 AM
Abbas Sherif
8 5,709
Reference: Ununbium - Wikipedia
Jun14-09 06:23 AM
malawi_glenn
2 1,695
Hi, 1: I just want to ask that what does SU(3) x SU(2) x U(1) means? and when a lagrangian is invariant under...
Jun15-09 11:13 AM
nrqed
2 5,926

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