We have to analyze the following decays or reactions in terms of the quark contents of the particles: (a) ; (b) ; (c) ; (d) .

Solution:             Click For PDF Version

We write the quark contents of the particles involved in the decays and reactions that we are analyzing.

(a)

We write the quark contents of the particles in the decay . We get

.

Cancelling the two dd from the left and the right sides of the decay relation, we get

.

That is in the weak interaction process an s quark is transformed into a d quark and a pair is created from the decay energy.

(b)

We write the quark contents of the decay process

. We get

.

Cancelling d from the left and the right sides of the decay process relation, we get

.

That is in the weak interaction process an quark is transformed into a quark and a pair is created from the decay energy.

(c)

We write the quark contents of the particles in the reaction . We get

By cancelling out uuu from the left and the right hand sides of the reaction, we note that pair goes into pair. The reaction process takes place due to strong force.

(d)

We write the quark contents of the particles in the reaction . We get

.

In this reaction process which is due to force of electromagnetic interaction udd goes into udd plus pair.