Particle Physics Questions
Q3. The table gives information about some fundamental particles.
particle |
quark
structure |
charge |
strangeness |
baryon
number |
proton  |
u u d |
+1 |
0 |
+1 |
Sigma
+ |
u u s |
+ 1 |
-1 |
+1 |
π+ or positive pion |
u  |
+1 |
0 |
0 |
(a) Complete the table by filling in the missing information.
(7 marks)
(b) Each of the particles in the table has an antiparticle.
(i) Give one example of a baryon particle and its corresponding antiparticle.
proton and antiproton
(1 mark)
(ii) State the quark structure of an antibaryon.
three antiquarks
(1 mark)
(iii) Give one property of an antiparticle that is the same for its corresponding particle and one property that is different.
They have the same (rest) mass (energy) but diffent baryon number or charge
(2 marks)
(Total 11 marks)
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