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

by jagdishdash
Tags: decide, elementey, particles, position, quarks, type
 P: 11 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 ??
 Mentor P: 15,576 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".
P: 11
 Quote by Vanadium 50 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".

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

PF Gold
P: 1,111

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

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}}##.
 Sci Advisor HW Helper P: 1,933 The 'up' and 'down' names for quarks have no connection to up or down positions in space.
 P: 11 Ok it means proton uud and antiproton anti uud not the positions thanx all
 Sci Advisor HW Helper P: 1,933 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.
P: 11
 Quote by 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.

ok yah I got it atlaaast
thanx all
 Sci Advisor P: 5,935 Names of quarks are purely made up - nothing to do with physics. Note that the intermediate level quarks are named charm and strange.
 Mentor P: 11,231 Then you have the quark color charges, red, green and blue, which have nothing to do with visual colors.

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