Quarks

[ChromeStar]

I have to say it can be difficult o find what your looking for on the web and sometimes you get results but not quite the right ones.

So i just wanted to know if any one knows a little about Quarks, i don't mean info lik they make up sub atomic particles and bosoms and so on, but info on things like what they're made of. I hear they go further.

[bossman20081]

Click here for some info on quarks.

[Betelgeuse]

Quarks are subatomic particles that are thought to be completely elemental and indivisible. They are known as being one of the two "spin-1/2 fermions". Objects that are made up from quarks are known as "hadrons". You'll find that protons and neutrons found in the nucleus of the atom are the most obvious examples of hadrons.

Quarks have a colour charge - this makes them different to leptoms - the other type of "spin-1/2 fermions". Quarks have a fractional eletric charge - +2/3 or −1/3. Leptons have integral electric charge - −1 or 0 in units of the proton charge.

Quarks are in fact believed to never exist alone but only in color-neutral groups of two or three.

Here are some definitions of quarks you may find interesting.

I do hope this helps.
Rigel

[StarLab]

To expand on what Rigel said:

There's only six quarks in nature: up, down, top, bottom, charm, and strange. The first two are the most common, as protons are two ups and one down, and neutrons are two downs and one up (thus their electric charges). Electrons are also elementary, so they are not made up of quarks. Quarks can come in groups greater than three, but those are rare and probably only produced in high-tech particle accelerators.

To find out about leptons, fermions, bosons, hadrons, etc., do a google on Tom Potter's physics tutorial.

[ChromeStar]

Shot, thanx for the help!!!

[wstevenbrown]

Quarks aren't the only game in town. Other kinds of partons can have unitary charges. In the conventional history, this is glossed over, but even Feynman gave the idea serious consideration. My impression is that it was computationally more difficult, so we took the path of least computation. S

[blueshift]

Originally posted by wstevenbrown@Nov 19 2004, 08:32 PM
Quarks aren't the only game in town. Other kinds of partons can have unitary charges. In the conventional history, this is glossed over, but even Feynman gave the idea serious consideration. My impression is that it was computationally more difficult, so we took the path of least computation. S

Abdus Salam speculates that that color and flavor of quarks can be separated into
preons..He even proposes assigning leptons a color of their own..Then, with just ten preons ( 4 colors and 6 flavors) all leptons and quarks can be created..

blueshift

[wstevenbrown]

Blueshift-- Info request. Did the preons solve the problems with spin angular momentum distribution inside the hadrons? When last I looked, QCD was working well, except for this. :blink: Steve

[blueshift]

Originally posted by wstevenbrown@Nov 22 2004, 06:25 PM
Did the preons solve the problems with spin angular momentum distribution inside the hadrons? When last I looked, QCD was working well, except for this.

Steve,

Thanks for the reply...I did a search and found a pdf file by Sverker Fredriksson who proposes that he can sove the problems you raised with just 3 stable preons arranged in a supersymmetric model that he insists can bring an electrostrong unification; explain neutrino oscillation; and throws out the need for the Higgs by
relooking at W and Z bosons and reclassifying them..Go here.

Can't say if it holds water, but sounds pretty good...and it's readable.

blueshift