Register to reply

Red quark going to a red quark via an gluon emission

by Tauk-De
Tags: emission, gluon, quark
Share this thread:
Tauk-De
#1
Aug15-13, 09:08 PM
P: 2
Hi, I'm currently doing a course in particle physics at masters level and I have this problem:

I know that having an red:anti-red gluon isn't possible as this produces an non-zero trace for its representation, but if I have a red quark that emits a gluon and afterwards is still a red quark, what would be the possible gluon combinations/colors? is it just the two linear combinations: (R:aR - B:aB)/sqrt(2) and (R:aR + B:aB - 2G:aG)/sqrt(6) ???

Thanks in advance
Phys.Org News Partner Physics news on Phys.org
Mapping the optimal route between two quantum states
Spin-based electronics: New material successfully tested
Verifying the future of quantum computing
Tauk-De
#2
Aug15-13, 11:12 PM
P: 2
never mind I found out
tom.stoer
#3
Aug16-13, 12:28 AM
Sci Advisor
P: 5,366
Quote Quote by Tauk-De View Post
... if I have a red quark that emits a gluon and afterwards is still a red quark ...
That's not possible b/c the gluons living in the adjoint rep. of su(3) always change color. A process where the quark color is not affected is possible only in u(3) = su(3) + u(1) where the last u(1) term corresponds to a color-neutral force which would look like QED.

lpetrich
#4
Aug16-13, 12:31 PM
P: 518
Red quark going to a red quark via an gluon emission

In a common presentation of SU(3) operator matrices, two of them won't change color, but will give different phases to different colors.

A colorless operator would give the same phase to every color.


Register to reply

Related Discussions
Quark-gluon plasma High Energy, Nuclear, Particle Physics 4
Quark Gluon Plasma High Energy, Nuclear, Particle Physics 1
Quark-Gluon liquid High Energy, Nuclear, Particle Physics 2
Quark Gluon Plasma High Energy, Nuclear, Particle Physics 5
Quark-Gluon Plasma Atomic, Solid State, Comp. Physics 15