Dynamics of Glueball and qqbar production in the central region of pp   collisions
  We explain the phi and t dependences of mesons with JPC = 0-+, 0++,1++, 2-+ and 2++ produced in the central region of pp collisions. For the 0++ and 2++ sector this reveals a systematic behaviour in the data that appears to distinguish between qqbar and non-qqbar or glueball candidates. 
F.E. Close, A. Kirk and G. Schuler