wht are the quarks,,,,,???

Question

michele_laino · Answer

quarks are subnuclear particles, which was introduced by G. Zweig first, and M. Gellman after. For example a proton is composed by three quarks, namely
$p=uud$ wher $u$ is the $up-quark$, and $d$ is the $down-quark$.
Similarly, neutron is composed by three quarks:
$n=udd$
Furthermore, all known particles have their corresponding quark content. I'm speaking about the $Quark\;Model$. Such model is in continuous development, especially after the experimental observation of the $Higgs$ boson, whose existence was theoretically predicted by the same scientist $P.\;Higgs$

michele_laino · Answer

oops... which were* introduced

michele_laino · Answer

I mean $Quark \;Model$ or better $Standard\;Model$

anonymous · Answer

wht  is isospin direction up & down??? quuarks hv charges ,how tht charges defined as u=+2/3,isospin=+1/2 & strangness=0.....wht is stragness in this??

michele_laino · Answer

here are some data:
there are six types of quarks, namley:
first generation:  $u$, and $d$
second generation: $s$ and $c$, where $s$ stands for $stangeness$ and $c$ stands for $charm$
third generation: $b$ and $c$, where $b$ stands for $beauty$ and $t$ stands for $top$

anonymous · Answer

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michele_laino · Answer

strangeness is a quantum number
furthermore, the spin of $u-$quark is 1/2, whereas the spin of the $d-$quark is -1/2
next we have the subsequent electrical charges:
$u-$quark--->q=2/3 e
$d-$quark---> q=-1/3 e
here $e=4.8 \cdot 10^{-10}$ esu