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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
ZapperZ
1 21,052
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 34,419
I read it some where that there is very small decoherence for photons. The reason being that photons do not interact...
T 12:15 PM
Halaaku
0 15
Ive attached the R ratio formula to this post, please could someone who is familiar with it tell me what Nc is? ...
T 07:19 AM
rwooduk
4 102
What are the lowest energy transmutation caused by a neutrino and an antineutrino respectively?
Y 09:00 AM
Vanadium 50
7 215
Is there something like a "neutrino spectrum"?. Would it be analog to light spectrum?. Sorry for the ignorance, just...
Apr18-14 07:58 PM
kurros
3 254
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
Bill_K
1 232
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
mfb
3 230
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
andrien
4 279
What is the Decay Width of a particle and how is it related to the particle's lifetime ?
Apr18-14 06:19 AM
UltrafastPED
1 159
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
Mordred
20 559
I know that fermions and bosons can thermodynamics can be calculated via the Fermi-dirac or Bose_Einstein...
Apr17-14 01:54 PM
Mordred
4 246
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
rwooduk
3 291
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
metamathphys
3 369
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
1 244
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
teaforone
4 295
Hi folks, I've been reading about Montonen-Olive duality and understand that two different classical theories can...
Apr15-14 03:52 PM
metroplex021
0 218
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
RGevo
9 433
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
Einj
2 307
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
9 400
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
bcrowell
4 313
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
mfb
4 412
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
Naz93
3 361
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
mfb
2 275
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
mfb
6 539
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
Einj
6 328
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
samalkhaiat
5 333
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
Naz93
3 341
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
clem
2 318
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
ofirg
10 369
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
6 336
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
strangerep
67 5,343
How can we determine the ranges of strong interactions and weak interactions? Can calculations of relevant scattering...
Apr9-14 09:36 PM
Simon Bridge
4 325
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
spookyfish
2 285
Why is the chiral symmetry breakdown determined for the vector/axial current as: V =...
Apr9-14 05:07 PM
The_Duck
1 284
THREAD CHANGE *SPINOR IDENTITY*...although it's connected with SuSy in general, it's more basic... I am trying to...
Apr8-14 03:28 PM
andrien
3 388
The Monte Carlo simulation is a very important tool in particle physics specially to tune in the preciseness of the...
Apr8-14 02:33 AM
RGevo
3 504
I mean Goldstone bosons in the title. Sorry I don't know how to edit the title. Goldstone's Theorem says that...
Apr7-14 10:22 PM
karlzr
10 554
I have two related questions to ask relating to statements found in introductory particle physics textbooks. The...
Apr5-14 05:15 PM
Bill_K
1 374
Hello, I need some help understanding the possible decays of buttomonium b\bar{b}. If I consider weak and...
Apr5-14 10:52 AM
kuecken
2 519
I'm not sure if I can ask this question clearly, but anyway... We have this collection of 17 or so particles. Some...
Apr5-14 06:27 AM
mfb
9 561
Hi all, I've been seeing this again and again, that delayed neutrons are the ones that are allowing thermal nuclear...
Apr4-14 05:58 PM
mfb
7 426

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