# How position of quarks decide the type of elementey particles ?

1. Jan 6, 2014

### jagdishdash

I red the book halliday resnick I come to know
protons and other such elementry particles are composed of further subparticles called quarks

also that these quarks decide rather its proton or antiproton
as if the arrangement of quarks are like 2up quarks up and 1down quark down then its proton
and if its 1down quark up and 2up quarks down then its antiproton
here comes my doubt if its so
while the proton and nutron interchanges their positions the proton moves down and up and left and right
at this time the proton's quarks postion changes to antiproton's quark position
but this doesnt happens ??
then how we can say that the position of quarks decide the type of elementry particle ??

Last edited: Jan 6, 2014
2. Jan 6, 2014

Staff Emeritus
I'm sorry, but I didn't understand this. Could you perhaps rewrite it? Also, it would help to gave something more specific than just "some books".

3. Jan 6, 2014

### jagdishdash

I re edited my thread and u can check it now rather its self explanatory to u know or not ??

4. Jan 6, 2014

### Staff: Mentor

Quarks come in different flavours, two of which are called "up" ($\mathrm{u}$) and "down" ($\mathrm{d}$), see http://en.wikipedia.org/wiki/Quark. It has nothing to do with position.

The proton is made up of two up quarks and one down quark ($\mathrm{u}\mathrm{u}\mathrm{d}$). The antiproton is made up of the corresponding antiparticles to those quarks, $\bar{\mathrm{u}}$ for the up antiquark and $\bar{\mathrm{d}}$ for the down antiquark. Therefore, the antiproton is composed of $\bar{\mathrm{u}} \bar{\mathrm{u}} \bar{\mathrm{d}}$.

5. Jan 6, 2014

### Meir Achuz

The 'up' and 'down' names for quarks have no connection to up or down positions in space.

6. Jan 6, 2014

### jagdishdash

Ok it means proton uud and antiproton anti uud
not the positions
thanx all

7. Jan 7, 2014

### Meir Achuz

Historically, the names 'up' and 'down' referred to a representation in (non-spatial) isotopic spin that sometimes used up and down arrows for those two quarks. The same representation later led to the names 'top' and 'bottom' for the two heaviest quarks.

8. Jan 8, 2014

### jagdishdash

ok yah I got it atlaaast
thanx all

9. Jan 8, 2014

### mathman

Names of quarks are purely made up - nothing to do with physics. Note that the intermediate level quarks are named charm and strange.

10. Jan 8, 2014

### Staff: Mentor

Then you have the quark color charges, red, green and blue, which have nothing to do with visual colors.