|Mar29-12, 03:02 PM||#1|
Electro weak vertices
I have a question about Feynman Diagrams:
let's say we have a process: up antidown -> W+ -> up antidown...
the first vertex is like V_CKM G PL ( mixing, gamma, projector)
the second is the same..only with the complex conjugate CKM matrix...
If I compute the M* I have to bar the vertices..and there I got the same vertex..with the same flow..but there I would change PL to PR and interchange PL and Gamma..why is that the case?
physics news on PhysOrg.com
>> Promising doped zirconia
>> New X-ray method shows how frog embryos could help thwart disease
>> Bringing life into focus
|Mar30-12, 03:19 AM||#2|
|Mar30-12, 07:03 AM||#3|
I think another way of looking at it is like this.
That Feynman diagram also describes the processes
u → W+ + das all I have done here is replace the incoming anti-d with an outgoing d, and the outgoing anti-d with an incoming d.
The CKM matrix, as defined, is the factor for 'converting' down-type quarks to up-type, eg
|u> = Vud |d>Provided only the three known generations of quarks exist, the CKM matrix must be unitary, and hence
V-1 = V†so
|d> = V*ud |u>
|Similar Threads for: Electro weak vertices|
|Is electro-weak force intermediate for strong force happening?||High Energy, Nuclear, Particle Physics||4|
|What if electro-weak symmetry is broken at all energies?||High Energy, Nuclear, Particle Physics||4|
|A Question About Weinberg's Electro-Weak Lagrangian||General Physics||3|
|Number of Graphs on n vertices without isolated vertices||Calculus & Beyond Homework||0|
|Nuetralization Reaction involving a weak acid and weak base||Chemistry||3|