Production of vector mesons in hadron-A interactions

φ and ω − ρ production in d–C, d–U, S–U and Pb–Pb at SPS energies

“…Nuclear dependence of cross-sections [5] between d-C and d-U, parameterized as A α , leads to an α parameter which increases from 0.8 at M T = 1.35 GeV/c 2 to 1 at M T = 3 GeV/c 2 . The values for φ and ρ + ω are very close: for M T > 1.2 GeV/c 2 , α φ = 0.89 ± 0.05 and α ω+ρ = 0.85 ± 0.05 which compare well with other experiments [6], in particular when taking into account the rapidity and transverse momentum dependence. When going from deuteron to ion-induced collisions, by comparing either S-U to d-U or Pb-Pb to d-U using a parameterization B β A α ( B and A stand for the projectile and target atomic mass numbers, respectively), the behaviour is different: β ω+ρ increases at the level of 1, whereas β φ is significantly higher, at the level of 1.3.…”