Answer
Particle J made track 2.
Work Step by Step
The particle that created track 8 is known to have a seriousness quantum number of zero.
Then the particle that created track 8 is D or F.
D has a charge of -1 and F has a charge of 1.
According to the direction of curvature, only two other particles have the same charge as the particle that created track 8.
Thus the particle that created track 8 must have a charge of -1.
Particle D created track 8.
The particle that created track 9 must also have a charge of -1.
The sum of the charges of the particles that created tracks 7,8, and 9 must be positive.
Therefore, the particle that created track 7 must have a charge of at least +3.
Particle H created track 7.
The sum of the quantum numbers of the particles that made tracks 7, 8, and 9 must equal the quantum numbers of the particle that made track 6.
The particle that made track 9 is either E or G.
The sum of the quantum numbers of particles D, H, and E are: {1, 2, -3, -1}
The sum of the quantum numbers of particles D, H, and G are: {1, 1, 2, 0}
Only the sum of the quantum numbers of particles D, H, and E match up with a particle in the table.
Therefore, particle E made track 9, and particle C made track 6.
The particle that made track 5 must have a charge of -1.
By process of elimination, particle G made track 5.
The sum of the quantum numbers of the particles that made tracks 4, 5, and 6 must equal the quantum numbers of the particle that made track 1.
The particle that made track 4 is either A, F, or J, since the charge is 1.
The sum of the quantum numbers of particles C, G, and A are: {1, 2, -4, -4}
The sum of the quantum numbers of particles C, G, and F are: {1, 1, -2, -2}
The sum of the quantum numbers of particles C, G, and J are: {1, -5, -6, -8}
Only the sum of the quantum numbers of particles C, G, and F match up with a particle in the table.
Therefore, particle F made track 4, and particle A made track 1.
The particle that made track 2 must have a charge of 1.
By process of elimination, particle J made track 2.
