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Identified-hadron (PID) spectra from 2.76 TeV Pb-Pb and $p$-$p$ collisionsare analyzed via a two-component (soft + hard) model (TCM) of hadron productionin high-energy nuclear collisions. The PID TCM is adapted with minor changesfrom a recent analysis of PID hadron spectra from 5 TeV $p$-Pb collisions.Results from LHC data are compared with a PID TCM for 200 GeV Au-Au pion andproton spectra. 2.76 TeV proton spectra exhibit strong inefficiencies above 1GeV/c estimated by comparing the $p$-$p$ spectrum with the corresponding TCM.After inefficiency correction Pb-Pb proton spectra are very similar to Au-Auproton spectra. PID A-A spectra are generally inconsistent with radial flow.Jet-related Pb-Pb and Au-Au spectrum hard components exhibit strong suppressionat higher $p_t$ in more-central collisions corresponding to results fromspectrum ratio $R_{AA}$ but also, for pions and kaons, exhibit dramaticenhancements below $p_t = 1$ GeV/c that are concealed by $R_{AA}$. In contrast,enhancements of proton hard components appear only above 1 GeV/c suggestingthat the baryon/meson "puzzle" is a jet phenomenon. Modification of spectrumhard components in more-central A-A collisions is consistent with increasedgluon splitting during jet formation but with approximate conservation ofleading-parton energy within a jet via the lower-$p_t$ enhancements.

Differential comparison of identified-hadron $\bf p_t$ spectra from  high-energy A-B nuclear collisions based on a two-component model of hadron  production