1.1. From the following set of particles

$p$ $\overset{¯}{n}$ ${ \mu }^{+}$ ${e}^{+}$ $\gamma$

identify all examples of:   

(i) hadrons, 

(ii) leptons, 

(iii) antiparticles, 

(iv) charged particles, 

(v) exchange particles.      

1.2. State the quark composition of 

 (i) a proton, 

 (ii) an antineutron.

1.3. A sigma plus particle,∑⁺ , is a baryon and has a strangeness –1.

Complete the missing information in Table 1 for the ∑⁺.

Table 1

1.4. State the name of the particle to which the sigma plus ∑ ⁺ will eventually decay.