1) it is desire to produce omega minus particle in proton-proton collision. find the reaction satisfying all strong interaction conseravation laws & requiring the smallest possible threshold energy. ----> i only know that omega minus can be produced by negative kaon + proton. how do the above can be possible? 2) find the reaction and threshold energy for production of omega minus by negative kaon +proton ---->i need more explanation how to find the threshold energy. the reaction already solved.