Question

What is the quark makeupof.${\overline{\mathbf{K}}}^{\mathbf{0}}$

Short answer

The kaons${\overline{K}}^0$ is made from.$s\overline{d}+\overline{s}d=0$

Step-by-step solution

Definition of kaon. 

A kaon is also named as $K$mesons. It is a group of your mesons divided by a quantum number called strangeness.

In the quark model there are bound states of a strange quark and an up or down antiquark.

The quark makeup of.K¯0 

The given kaons${\overline{K}}^0$ is neutrally charged antiparticle has the same mass and it contains a strange quark and a down antiquark.

The charge of ${\overline{K}}^0$is.$Q=0$

To make the overall charge zero, we need to take one quark and other an anti quark.

The possible quark is $s\overline{d}$ and $\overline{s}d$.

Strangeness of $s\overline{d}$ is $(-1)+0=-1$.

Strangeness of$\overline{s}d$ is.$(+1)+0=+1$

Hence the kaons ${\overline{K}}^0$are made from.$s\overline{d}+\overline{s}d=0$