5 research outputs found
Central-to-peripheral nuclear modification factors in Pb-Pb collisions at sqrt{s_NN} = 17.3 GeV
We present central-to-peripheral nuclear modification factors, R_CP, for the
p_T distributions of K^0_S, Lambda, Anti-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^0_S and Lambda R_CP(p_T) are similar in shape to those measured at
sqrt{s_NN} = 200 GeV at RHIC, though they are larger in absolute value. We have
compared our K^0_S R_CP data to a theoretical calculation. The prediction
overestimates the data at p_T \approx 3-4 GeV/c, unless sizeable parton energy
loss is included in the calculation.Comment: 13 pages, 5 figures, submitted to Physics Letters