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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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Feb23-13 08:41 AM
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God particle is 'found': Scientists at Cern expected to announce on Wednesday Higgs boson particle has been discovered...
Jul11-12 01:13 AM
178 34,706
Hi everyone, I have studied QFT, the SM and the Higgs mechanism when I was in university and after reading an...
T 05:03 PM
3 129
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
1 178
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Hi everyone. I'm studying Heavy Quark Effective Theory and I have some problems in proving an equality. I'm am...
Y 06:01 PM
7 282
All nuclei with A > 210 are alpha emitters, yet very few emit protons spontaneously. Yet both decays lower the...
Apr22-14 06:52 PM
2 309
Hi all, I am currently trying to calculate the beta function for scalar QCD theory (one loop for general su(n)). ...
Apr22-14 03:07 PM
1 198
Here's an example of the graphs I am currently studying. ...
Apr22-14 02:53 AM
2 292
Starting from the Lagrangian density: L= -\frac{1}{4}F_{\mu\nu}F^{\mu\nu} + \frac{m^{2}}{2} B_{\mu}B^{\mu} we can...
Apr21-14 08:03 AM
1 308
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
5 247
What are the lowest energy transmutation caused by a neutrino and an antineutrino respectively?
Apr19-14 09:00 AM
Vanadium 50
7 328
Is there something like a "neutrino spectrum"?. Would it be analog to light spectrum?. Sorry for the ignorance, just...
Apr18-14 07:58 PM
3 331
Hi, I am just learning some materials and struggling to find what the other octet is. I know the following: 3...
Apr18-14 09:37 AM
1 317
All the Feynman diagrams I have seen so far for a neutron colliding with a neutrino have a w+ with an arrow from the...
Apr18-14 09:26 AM
3 332
So I'm trying to show that one choice of representation for the SuSy generators fulfills the SuSy algebra.... (one of...
Apr18-14 07:11 AM
4 354
What is the Decay Width of a particle and how is it related to the particle's lifetime ?
Apr18-14 06:19 AM
1 240
Hi folks -- does anyone know of a proof that particle (quanta) number in QFT is / is not Lorentz invariant? I'd be...
Apr17-14 03:53 PM
20 664
I know that fermions and bosons can thermodynamics can be calculated via the Fermi-dirac or Bose_Einstein...
Apr17-14 01:54 PM
4 312
i've looked online and the closest i've found to a definition is this: what does this mean? i understand that...
Apr17-14 07:21 AM
3 359
This is related to a homework problem but I want to understand it as well. How can a proton break up into a positron...
Apr16-14 11:14 AM
3 429
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
1 309
Hi Folks, We use a UV bulb in my workplace which contains deuterium gas. The bulb is safely contained within a...
Apr15-14 06:04 PM
4 350
Hi folks, I've been reading about Montonen-Olive duality and understand that two different classical theories can...
Apr15-14 03:52 PM
0 277
Consider e+e* -> q+q* in the centre of mass frame. Where I am using star for antiparticle. the quark and anti...
Apr15-14 07:11 AM
9 489
I'm looking at charmonium and its decays. Given a list of data on the charmonium states I'm asked to say why ψ'' has...
Apr14-14 07:20 AM
2 361
Hi all, I have a couple questions about radiation from radioactive elements. I've read a lot of articles on the...
Apr13-14 10:46 PM
Simon Bridge
9 458
Hi. This may be a trivial question, but I'm unable to find a definitve answer. How is the mass on a atomic...
Apr12-14 06:01 PM
4 367
Why are exited states of an Isotope metastable? Is it because they have a large spin and therefore the final states...
Apr12-14 10:00 AM
4 465
I came across a worked example question in a particle physics book this morning that had a beam of neutrinos of energy...
Apr12-14 03:34 AM
3 412
So i have a question regarding a homework question i'm working on which suggest a neutral pion travelling with...
Apr11-14 05:55 PM
2 328
I read this on a website called Physics for Idiots "If an electron gets near another electron it emits a virtual...
Apr11-14 04:06 PM
6 594
Hi everyone. I have been studying CP violation in kaon systems. I would like to know is someone can explain why, to...
Apr11-14 02:16 PM
6 385
I am trying to derive the conserved charge from the symmetry of the action under Lorentz transformations, but I am...
Apr11-14 02:04 PM
5 386
I'm learning about particle physics at the moment, and have read that the J=3/2 multiplet contains baryons comprised...
Apr10-14 01:50 PM
3 396
In SM, people say the ##SU(2)\otimes U(1)## theory unify the EM and weak interaction. I understand that the two...
Apr10-14 12:35 PM
2 377
I don't completely understand why an electron positron pair cannot be created from an isolated photon. I understand it...
Apr10-14 07:59 AM
10 422
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
6 385
1) Since Wigner it is well known that for massless particles of spin s the physical states are labelled by helicity h...
Apr9-14 10:37 PM
67 5,560
How can we determine the ranges of strong interactions and weak interactions? Can calculations of relevant scattering...
Apr9-14 09:36 PM
Simon Bridge
4 379
Hi. I was reading Griffiths page 289 and I wasn't sure how the transition from Eq. (8.45) to (8.46) was allowed. What...
Apr9-14 07:20 PM
2 334
Why is the chiral symmetry breakdown determined for the vector/axial current as: V =...
Apr9-14 05:07 PM
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