Centrality dependence of pi(+/-), K-+/-, baryon and antibaryon production in Pb+Pb collisions at 158 A GeV

We present new results of the CERN experiment NA52 on the centrality depend ence of pi(+/-), K+/-, p, d, (p) over bar and (d) over bar production yield s near zero transverse momentum and at several rapidities, from 64% to 4% o f the total Pb + Pb cross section. Baryon yields increase nearly linearly a nd K+/- yields faster than linearly with the number of participating nucleo ns N-p. The antibaryon yields increase less than linearly with N-p, indicat ing absorption. The centrality and rapidity dependence of the pi(-)/pi(+) r atio indicates Coulomb interaction of the pions with the projectile spectat or protons. Within the framework of a coalescence model the radius of the p article source has been estimated from the ratios d/p(2) and (d) over bar/( p) over bar(2). The source radii are similar for matter and antimatter and are found to increase with similar to N-p(0.30-0.36).