Comparison of transverse single-spin asymmetries for forward π0 production in polarized pp , pAl and pAu collisions at nucleon pair c.m. energy sNN=200 GeV
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Nuclear medium effects on meson production are studied using the binary-collision scaled cross section ratio between events of different charged-particle multiplicities from proton-lead collisions. Data, collected by the CMS experiment in 2016 at a nucleon-nucleon center-of-mass energy of , corresponding to an integrated luminosity of , were used. The scaling factors in the ratio are determined using a novel approach based on the cross sections measured in the same events. The scaled ratio for is consistent with unity for all event multiplicities, putting stringent constraints on nuclear modification for heavy flavor. © 2025 CERN, for the CMS Collaboration2025CERNmore » « less