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In preparation for the heavy ion program at the relativistic heavy ioncollider (RHIC) $d$-Au collisions were designated as a control experiment forpossible discovery of a quark-gluon plasma (QGP) in more-central Au-Aucollisions, and contrasting results from the two systems seemed to support sucha discovery. In contrast, recent results ($p_t$-spectrum andangular-correlation features) from $p$-Pb collisions at the large hadroncollider (LHC) have been interpreted to support claims of hydrodynamic flowsand QGP formation even in small collision systems. The present study addressessuch claims via a two-component (soft + hard) model (TCM) of identified-hadron(PID) $p_t$ spectra from 5 TeV $p$-Pb collisions. $p$-Pb centrality is adoptedfrom a previous study of ensemble-mean $\bar p_t$ data from the same system.$p$-Pb $p_t$ spectra for pions, kaons, protons and Lambdas are described by theTCM within their point-to-point uncertainties. Invariance of the TCM hardcomponent vs $p$-Pb centrality indicates that jet formation remains unchangedin $p$-Pb collisions relative to $p$-$p$ collisions, and radial-flowcontributions to spectra are negligible. These $p$-Pb TCM results haveimplications for interpretation of similar data features from A-A collisions interms of QGP formation.

A two-component model for identified-hadron $\bf p_t$ spectra from 5 TeV p-Pb collisions