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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
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 54,686
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 24,626
A few years ago, Tamar Friedmann (then at MIT) wrote two papers proposing a new interpretation of the hadron spectrum,...
Jan29-13 07:48 PM
Vanadium 50
1 878
Hi I'm trying to understand how the sum over spin polarizations is treated when using the Narrow Width...
Jan29-13 08:15 AM
andrien
6 1,272
I have been reading a lot about nuclear plants and how when things go wrong the whole area becomes inhabitable. I have...
Jan29-13 06:20 AM
mfb
3 1,162
A question I'm sure I've seen asked here and/or elsewhere is why there doesn't seem to be any classical force...
Jan29-13 04:26 AM
Bill_K
3 925
I need to find the statistical error in a counting experiment. Specifically, a decay can proceed via option A or...
Jan28-13 09:33 PM
Meir Achuz
2 823
Hello Everybody, I am learning QFT using Sidney Colemans lecture notes (and the Peskin Schroeder book). They can be...
Jan28-13 01:54 PM
silverwhale
4 807
Some researchers seem to have measured the proton as being 4% smaller than previously thought: ...
Jan28-13 09:25 AM
mfb
4 943
Why do some isotopes occur naturally even though a seemingly valid decay with non-negligible energy release ~Mev,...
Jan27-13 09:02 AM
snorkack
6 1,015
Okay, so I've just begun to have a grasp on the concepts of quantum chromodynamics. And what amazes me is that quarks...
Jan27-13 08:07 AM
AdrianTheRock
11 2,382
Material in context is in a different color (blue) Okay I'd like to first begin by claiming/stating a few things....
Jan26-13 12:31 PM
mfb
5 1,019
Hi! I have a little problem. Consider a 4-fermion interaction (neglecting constant factors) of the form ...
Jan26-13 06:22 AM
andrien
1 719
Say we have a particle, what are the most fundamental properties that distinguishes it from another kind of a...
Jan25-13 10:58 AM
mfb
13 3,061
Or, more generally, can we destroy a nucleon? I know we can convert between a proton and a neutron, but what about...
Jan24-13 08:15 PM
Aromal
8 1,878
I'd just like to clarify something I read on Wikipedia: "The branching ratio of the common purely leptonic tau...
Jan24-13 10:15 AM
Einj
1 884
Physicists often remark about the absence of antimatter in the universe. My question here sounds simple, but the...
Jan24-13 03:33 AM
Simon Bridge
4 829
I've read that the experimental results of Z-Boson resonance confirm the theoretical expectations that there are...
Jan22-13 07:06 PM
Ngineer
3 939
What's the least energy required to create a fundamental particle of mass m,what would be ur answer? mc^2 or 2mc^2 ...
Jan22-13 05:05 PM
Ezio3.1415
5 928
I read that matter-antimatter annihilation is not as useful as we thought because a large amount of energy is carried...
Jan20-13 04:30 PM
mfb
3 1,116
On decays I have only a preliminary understanding. I was looking up the half life of a neutron for another reason. ...
Jan20-13 01:02 PM
Mordred
2 2,198
Hi, I am reading in some books that after the \beta-decay of neutrons, the maximum energy of the resulting...
Jan20-13 04:05 AM
mfb
2 935
I remember learning that a pseudoscalar is one that changes sign under a parity inversion, like the determinant of a...
Jan18-13 04:27 PM
D H
3 1,204
I understand that nucleons (protons and neutrons) consist of 3 valence quarks and a sea of other stuff, virtual...
Jan18-13 09:05 AM
mfb
6 1,000
In Mark Srednicki's book "Quantum Field Theory" He says that a tensor field B^{αβ} with no particular symmetry can...
Jan17-13 03:03 PM
su-ki
3 881
In quark-level diagrams of decays, I often see, for instance, a baryon with one quark emitting a gluon and then the...
Jan17-13 07:57 AM
mfb
5 998
During nuclear fission a heavy nucleus of low binding energy splits into two middle mass nuclei with high binding...
Jan17-13 07:08 AM
mfb
5 1,177
It is well known due to the famous argument by Dyson that the perturbation series for quantum electrodynamics has zero...
Jan16-13 12:06 PM
The_Duck
1 1,044
Provided they aren't in an excited state (which would allow a decay via EM or strong). I had a question asking why the...
Jan16-13 08:58 AM
mfb
9 1,834
Why does the Z boson only decay to fermion-antifermion pairs? I'd just like to understand the basic reason why...
Jan16-13 08:43 AM
mfb
4 1,099
Hello! I have a small question, and Im not sure if im missing something: Today I glanced at the wikipedia page for...
Jan14-13 11:55 AM
FeynmanIsCool
1 1,100
100mbq tc 99 requires how much mo 99? Answer in number of atoms, assume equilibrium conditions: 67/6.4 *1x10^8 = 1...
Jan13-13 11:33 PM
jtbell
2 662
can anyone give an example in which a nucleus absorbs a neutron and becomes a stable nucleus? or the combination...
Jan13-13 12:32 PM
Astronuc
7 1,073
Part 1----------------------------------------- Ok, the site I have just read through is this one. I have a few...
Jan13-13 12:20 PM
Astronuc
19 2,168
protons and neutrons interact with each other with the strong force, which is very strong however, there are many...
Jan13-13 07:29 AM
mfb
4 676
Ive searched in vain for a listing of what particles with which interactions decay into which particles. This is a...
Jan12-13 12:04 PM
Mordred
2 834
I'm looking at a model of plasma which is using the quantum Boltzmann kinetic equation in the non-degenerate limit. I...
Jan11-13 10:32 AM
Alexjcb
0 713
When two high energy photons collide with each other, what determines whether a pair production results or whether a...
Jan11-13 06:42 AM
andrien
6 993
(high school level physics btw) apparently all baryons eventually decay into protons, so I was just curious to know...
Jan10-13 12:15 PM
question dude
2 991
Not sure where to post this, but this question has been frustrating me for hours now because I'm pretty sure it has a...
Jan10-13 08:07 AM
Bballer152
0 568
Would it just be the same as with two electrons? (or any other pair of particles with the same charge) ...
Jan10-13 01:37 AM
agostino981
20 3,425
If two protons collide at the LHC and a quark from each undergo a weak interaction together to form a W/Z boson, then...
Jan9-13 07:20 PM
Vanadium 50
3 775

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