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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 25,026
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 57,771
(1) Is it true that when a pair of particles is created from a Photon, that the Photon Energy (h x nu) is equal to...
Mar19-04 08:53 PM
mathman
2 1,745
At the beginning of cpt 9, Griffiths states that massive bosons have three polarization states (m_s = 1, 0, -1), but...
Feb3-13 12:30 PM
Bill_K
1 763
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
2 825
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
1 888
https://particle.phys.uvic.ca/twiki/pub/Main/AlisonFaulkner/Drell-Yan.jpg The Feynman diagram for Drell Yan has a...
Jan30-13 10:46 AM
jtbell
10 1,390
The parity operator has eigenvalues of +/- 1 and particles can have intrinsic parity of +/- 1. What does it matter?...
Feb10-13 08:06 AM
mfb
1 683
I am confused about when and to what extent parity is violated in weak decays. On the one hand, there's Wu's famous...
Mar18-13 11:39 AM
ofirg
3 837
I am reading about group theory in particle physics and I'm slightly confused about the word "representation". ...
Mar17-13 01:34 PM
JoePhysicsNut
2 744
A quark and antiquark have opposite parity. The quark is customarily taken to have positive parity. I understand this...
Apr3-13 11:35 AM
JoePhysicsNut
2 1,210
The W couples to left-handed particles only. What about the Z? Is it the same? Thanks in advance!
Apr23-13 07:22 AM
JoePhysicsNut
2 846
Both Rho^0 and Pi^0 are bosons so require an overall symmetric wavefn. However, they are in different spin states: the...
May9-13 03:19 PM
JoePhysicsNut
3 606
I had a look at the production cross sections for W/Z at hadron colliders. These differ as a function of energy with...
Jul5-13 12:06 PM
Vanadium 50
2 942
Why is it necessary to use Monte Carlo methods in high energy physics? There is Feynman calculus to evaluate matrix...
Jul7-13 03:43 PM
RGevo
2 936
I've heard of cosmic rays affecting measurements made at the LHC in the context of muons. Is it just muons that can...
Jul23-13 03:09 PM
JoePhysicsNut
3 1,155
Why is there seemingly so little interest among particle physicists about discovering the graviton? Is it because it...
T 11:42 AM
joeyb9
0 1
We know that the Higgs-particle gives an explanation as to why there is mass in the universe. But mass has another...
Jul4-12 06:21 PM
Ricky116
7 1,715
Some time agoo I read in a posting here that someone had pedicted a SM Higgs mass around 126 GeV because a heavier...
Jul5-12 08:40 AM
johanw
0 583
I had always assumed that the simplest possible standard model Higgs particle had isospin 0, but when I tried to...
Jul9-12 06:33 AM
johanw
2 1,278
I seem remember hearing that spin-1 was ruled out but since reading this paper I am unable to find any info on spin-1...
Feb22-13 08:19 AM
Bill_K
2 161
At school I was taught that when any matter particle is accelerated until it almost reaches light speed, its mass...
Jul7-12 02:07 PM
alemsalem
1 778
The LEP collider operated at a maximum of 209 GeV. Could it have been used to confirm the existence of the 125.3 GeV...
Jul9-12 02:18 PM
mfb
3 764
The problem is showing (□+m^2)<0| T(∅(x)∅(y)) |0> = -δ^4 (x-y) I know that it is relavent to Green's function,...
Nov12-13 09:34 AM
ehms
2 1,576
I'm trying to calculate the symmetry factor in this diagram. I'm calculating in a way expanding the interaction...
Dec7-12 07:20 AM
johnahn
0 766
Lagrangian I have is little bit massy so I don't write in here. Like in ψψ(dagger) , or ψ∅ -> ψ∅, How can I...
Dec14-12 02:48 AM
andrien
2 875
Hi, I understand that anti-particles have the opposite charge to particles. Do anti-particles have the opposite...
Feb5-12 06:35 AM
clem
9 3,852
Has a very light (less than 1eV) Higgs mass been excluded by theory and/or experiment?
Sep26-11 09:51 AM
fermi
2 1,722
Is this the correct form for a Dirac electron in a Higgs field with scalar potential \phi and an electromagnetic field...
Dec21-11 07:06 PM
johne1618
2 2,455
I understand that the the Higgs field has a vacuum expectation value of 246 GeV. I think that means that the...
Dec12-11 01:32 PM
Bill_K
1 2,519
Would electromagnetic coupling between an electron with charge e and an electromagnetic field with scalar potential...
Dec13-11 12:32 PM
BDOA
3 2,620
If most of the mass/energy of a proton is due to the kinetic energy of its quarks and gluons, rather than interaction...
Dec20-11 02:38 PM
torquil
15 3,098
The Dirac electron in the Higgs vacuum field v and an electromagnetic field with vector potential A_\mu is described...
Dec27-11 04:24 AM
johne1618
7 2,073
Hi, Despite decades of searching magnetic monopoles haven't been found. Could it be that they are existing as...
Apr2-12 08:53 AM
ZapperZ
1 1,131
Roger Penrose in Chapter 25 of his book The Road to Reality describes a "zigzag" model of the electron that consists...
Jul22-12 06:48 AM
johne1618
8 1,939
As I understand it in a normal superconductor electromagnetic fields are extinguished by opposing fields produced by...
Jul25-12 04:51 PM
Bill_K
1 904
What is the current state of the hypothesis of mirror matter today? Are there any experimental data or theoretical...
Apr10-13 07:26 PM
kurros
12 1,322
I expect you've heard about how the proton's weak charge has been measured directly: ...
Sep29-13 09:22 AM
Bill_K
4 1,154
Sorry - a very vague question: Could a superconductor be used to detect dark matter? The dark matter might...
Nov5-13 08:16 AM
johne1618
2 809
Imagine that two electrons interact by exchanging a virtual photon. Electron A gains momentum ##-\vec{p}## and...
Nov5-13 07:43 AM
johne1618
2 867
Can the classical electromagnetic force between two arbitrarily moving electrons, described by the Lienard-Wiechert EM...
Dec1-13 03:38 PM
meopemuk
1 699
Let us assume that we want to describe the full process of photon emission by electron A and absorption by electron B....
Jan8-14 03:10 PM
johne1618
0 648

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