1. The problem statement, all variables and given/known data Question: Figure 1: QUESTION ABOVE. 2. Relevant equations 3. The attempt at a solution: P + P → K+ + K- + P + P Firstly, I just wanted to check that this is correct. I found the answer pretty quickly by googling it but have since spent a long while trying to understand it. I was hoping that someone might be able to affirm what I have learnt as I have read so much that I feel like I'm getting everything a bit confused now. As far as I'm aware everything in this collision is conserved apart from the isospin. Is this okay to do? and does this mean that I can now assume that this is an Electromagnetic Interaction? Secondly, Figure 1. gives the table we will be given in our upcoming exam. I was wondering what a few of the table headings are supposed to denote. In the quark table: I assume J = spin I3 = Isospin then what does I mean? and then again in the Hadron table: J = spin? I = Isospin?