
God particle is 'found': Scientists at Cern expected to announce on Wednesday Higgs boson particle has been discovered...

Jul1814 12:32 PM
ChrisVer

187 
61,655 
Before posting anything, please review the Physics Forums Global Guidelines.
If you are seeking help with a...

Feb2313 08:41 AM
ZapperZ

1 
25,736 
I'm not sure which location to post this in; but since it deals with the very small (subatomic), then I'll post it...

Oct1607 09:02 PM
Rahmuss

2 
1,333 
Hello you guys. I was wondering about the energy limits of the gamma rays. I allready know that the gamma ray spectrum...

Aug1507 07:55 PM
chroot

2 
2,409 
An electron has a negative charge and a proton has a positive charge, we say. Meaning that both are opposites of each...

Aug3007 03:31 PM
dextercioby

2 
1,844 
This has been annoying me since I read this somewhere.
Beta decay is only possible if energetically allowed. For...

Sep107 01:57 PM
Astronuc

2 
3,088 
The muon energy loss equation (at high energies) is:
dE/dx = a(E) + b(E)E
where a(E) represents the ionization...

Sep2107 05:08 PM
Astronuc

2 
1,529 
If you have a proton and an antiproton travelling in the same direction with momentum from A to B but during the...

Sep507 07:45 AM
max_emerso

2 
1,733 
From Resonance(s)
http://resonaances.blogspot.com/2007/09/drowninghierarchyproblem.html
Extremely contrived,...

Sep1207 05:29 AM
Haelfix

2 
1,682 
Let me see if I get it right or I dreamed it: in order to give mass to a quark or a lepton the higgs field must be in...

Sep1307 05:56 PM
arivero

2 
1,350 
Dear all,
Have you any idea about the electron speed at 0K when the electron is free?
Patrick

Sep1407 12:23 AM
Gokul43201

2 
1,807 
I'm looking for some resources, as part of a project, where the deuteron quadrupole moment is worked out (from, say,...

Sep2407 08:37 PM
rahuldandekar

2 
1,913 
What research steps must be taken before we are able to convert hydrogen into carbon, oxygen, potassium, and so on? My...

Oct3007 04:11 AM
pallidin

2 
2,091 
QED = Quantum electrodynamics.
QCD = Quantum chromodynamics.
Is Electroweak Theory = Quantum flavordynamics (QFD)?...

Oct3107 05:01 PM
Urvabara

2 
3,016 
Hi, as I understand the photon can according to todays theory have a very small mass. What would this actually mean if...

Nov607 02:13 PM
blechman

2 
2,623 
uranium is fblock element..is there any relation between fblock elements and nuclear fuel...what i mean is ,i think...

Nov907 07:49 AM
Astronuc

2 
998 
I recently had a test question posed to me that asked firstly for an explanation of the terms in the semi empircal...

Nov1607 04:59 AM
genloz

2 
1,847 
I know we use radioactive elements in nuclear reactors and the heat given of to generate electricity in the...

Nov1607 04:04 PM
mathman

2 
2,958 
Hi.. I recently stumbled across a question that seemed a little bit odd "Show that the set of rotations in a plane...

Nov1607 08:26 AM
Norman

2 
1,394 
I read this in a paper: Suppose there is a theory describing fermions transforming nontrivially under SU(3) gauge...

Nov2307 09:36 PM
blechman

2 
4,449 
Can anybody help me with two confusions regarding notations in group theory/topology?
1. When we consider symmetry...

Nov2507 10:51 AM
George Jones

2 
3,220 
I am trying to study QFT from Weinberg's Vol. 1.
I am at the moment stuck at the path integral quantization of QED...

Dec307 02:28 PM
Reggaerules

2 
1,583 
I'm in a hurry so I'm going to say this quick.
For angular momentum you have
= i\hbar \varepsilon _{ijk} J_k ...

Dec2007 10:23 AM
blechman

2 
1,375 
Suppose a beta particle source. Using a G.M. scintillator and several aluminium foils we can find the absorption of...

Jan508 11:09 AM
Astronuc

2 
5,676 
Hi i got a short question if i know the following
U238 decays spontaniously to 2 Neutrons and Tellurium136 and some...

Jan808 09:16 AM
Mr.Brown

2 
3,422 
What does it mean when they say s wave cross section, p wave cross section .. ?

Jan2208 01:40 PM
Smoochie

2 
2,999 
Hello, I understand that the nonzero (or nonsmall) rate for \pi^0 \rightarrow \gamma\gamma was historically a big...

Jan3008 10:57 PM
Avodyne

2 
3,573 
http://xxx.lanl.gov/abs/hepph/0703260
Unparticle physics is currently a very popular research area. (The initial...

Mar1108 04:15 AM
Demystifier

2 
1,880 
I don't have access to Georgi's and Wilcheck's work, if somebody has some good links to an overview of the su(5),...

Feb108 02:27 AM
Barmecides

2 
1,782 
In equation (2.5.47),
I am getting
U(R(\hat p) = e^{+i \phi J_3} e^{+i \theta J_2}
Instead of the "" signs...

Feb408 08:56 AM
Reggaerules

2 
1,154 
Can there be cases where the cross section for the production of a radiative soft photon or gluon be larger than its...

Feb1108 09:30 PM
Vanadium 50

2 
1,915 
I'm currently taking intermediate Lab II (Physics 414) and we're currently working on Gamma Ray Spectroscopy. We are...

Feb1308 02:18 AM
Vanadium 50

2 
2,889 
Hello All,
I was doing some research on different particle accelerator designs when I came across this interesting...

Feb1308 03:36 PM
Jdo300

2 
1,407 
Why do they always say parity is maximally violated in weak interaction? This is true for W boson interactions. But...

Feb1308 07:35 PM
pam

2 
1,766 
Could someone please explain why relatively light nuclei do not undergo spontaneous fission? Thanks.

Feb1508 06:49 PM
Vanadium 50

2 
2,803 
Hello, I'm having trouble finding the rest energy of delta, on the internet. Can anyone give me this value please....

Feb1908 03:50 PM
pam

2 
1,813 
Alright, I've been looking around for an opinion on this for awhile:
Suppose you have a tube of deuterium whose...

Mar108 03:17 PM
Astronuc

2 
1,214 
A search of Quarkgluon_plasma at arxiv.org gave 112 hit for 2008...

Mar2808 10:20 AM
jal

2 
3,369 
I'm reading Feynman's book QED, and while I'll need at least another couple of readthroughs to grasp what I can,...

Mar2708 03:57 PM
rks1222

2 
3,836 
Hi All
I have some questions about monopoles, I would be grateful if someone help me in answering them.
1Does all...

Mar2508 12:09 PM
Haelfix

2 
1,260 
Hi,
While googling around further, I came across this reference:
...

Apr308 05:32 PM
sanman

2 
1,266 
Hey folks,
I have a pretty interesting Lagrangian setup:
\mathcal{L}=\frac{1}{4}(\nabla_a u_b \nabla_b...

Apr508 04:22 PM
robousy

2 
871 