The particles X 0 (1193) and Y (1321) can be produced in the strong interaction processes K + p Ï 0 + X 0 and

The particles X⁰(1193) and Y^ˆ’(1321) can be produced in the strong interaction processes K^ˆ’+ p †’ Ï€⁰+ X⁰and K^ˆ’+ p †’ K⁺+ Y^ˆ’respectively. Deduce the baryon number, strangeness, charm and bottom quantum numbers in each case and using these give their quark content. The Y^ˆ’(1321) decays by the reaction Y^ˆ’†’ Λ + Ï€^ˆ’. Use the €˜typical values€™ of Table 3.5 to give a rough estimate of its lifetime. 

Table 3.5 The combinations of charge and strangeness allowed for hadrons in the simple quark model for states with C = = 0. (b) Mesons (a) Baryons 1, 0 1, 0, 1 0, -1 2, 1, 0, 1 1, 0, 1 0, 1 1 -1 -2 -1 -3 -1