Abstract: Measurements of prompt ?(2S) meson production cross sections in proton?lead (pPb) and proton?proton (pp) collisions at a nucleon?nucleon center-of-mass energy of ?sNN=5.02TeV are reported. The results are based on pPb and pp data collected by the CMS experiment at the LHC, corresponding to integrated luminosities of 34.6 nb?1 and 28.0 pb?1 , respectively. The nuclear modification factor RpPb is measured for prompt ?(2S) in the transverse momentum range 4

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