Central-to-peripheral nuclear modification factors in Pb-Pb collisions at ?(S_NN )=17.3 GeV

F Antinori F, Antinori; Bacon Pa Bacon Pa,; A Badala A, Badala; R Barbera R, Barbera; A Belogianni A, Belogianni; Bloodworth Ij Bloodworth Ij,; M Bombara M, Bombara; Bruno Ge Bruno Ge,; Bull Sa Bull Sa,; R Caliandro R, Caliandro; M Campbell M, Campbell; W Carena W, Carena; N Carrer N, Carrer; Clarke Rf Clarke Rf,; A Dainese A, Dainese; D Di Bari D, Di Bari; S Di Liberto S, Di Liberto; R Divia R, Divia; D Elia D, Elia; D Evans D, Evans; Feofilov Ga Feofilov Ga,; Fini Ra Fini Ra,; P Ganoti P, Ganoti; B Ghidini B, Ghidini; G Grella G, Grella; H Helstrup H, Helstrup; Hetland Kf Hetland Kf,; Holme Ak Holme Ak,; A Jacholkowski A, Jacholkowski; Jones Gt Jones Gt,; P Jovanovic P, Jovanovic; A Jusko A, Jusko; R Kamermans R, Kamermans; Kinson Jb Kinson Jb,; K Knudson K, Knudson; V Kondratiev V, Kondratiev; I Kralik I, Kralik; A Kravcakova A, Kravcakova; P Kuijer P, Kuijer; V Lenti V, Lenti; R Lietava R, Lietava; G Lovhoiden G, Lovhoiden; V Manzari V, Manzari; Mazzoni Ma Mazzoni Ma,; F Meddi F, Meddi; A Michalon A, Michalon; M Morando M, Morando; Norman Pi Norman Pi,; A Palmeri A, Palmeri; Pappalardo Gs Pappalardo Gs,; B Pastircak B, Pastircak; Platt Rj Platt Rj,; E Quercigh E, Quercigh; F Riggi F, Riggi; D Rohrich D, Rohrich; G Romano G, Romano; K Safarik K, Safarik; L Sandor L, Sandor; E Schillings E, Schillings; G Segato G, Segato; M Sene M, Sene; R Sene R, Sene; W Snoeys W, Snoeys; F Somarel F, Somarel; M Spyropouloustassinaki M, Spyropouloustassinaki; P Staroba P, Staroba; R Turrisi R, Turrisi; Tveter Ts Tveter Ts,; J Urban J, Urban; P Van De Ven P, Van De Ven; Vyvre Pv Vyvre Pv,; A Vascotto A, Vascotto; T Vik T, Vik; Baillie Ov Baillie Ov,; L Vinogradov L, Vinogradov; T Virgili T, Virgili; Votruba Mf Votruba Mf,; J Vrlakova J, Vrlakova; P Zavada P, Zavada

doi:10.1016/j.physletb.2005.07.040

We present central-to-peripheral nuclear modification factors, R-CP, for the (PT) distributions of K-S(0), Lambda, Lambda, and negatively charged particles, measured at central rapidity in Pb-Pb collisions at top SPS energy. The data cover the 55% most central fraction of the inelastic cross section. The K-S(0) and Lambda R-CP((PT)) are similar in shape to those measured at root sNN = 200 GeV at RHIC, though they are larger in absolute value. We have compared our K-S(0) R-CP data to a theoretical calculation. The prediction overestimates the data at (PT) approximate to 3-4 GeV/c, unless sizeable parton energy loss is included in the calculation. (c) 2005 Elsevier B.V. All rights reserved.