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We investigate the role of partonic degrees of freedom in high multiplicityp-Pb collisions at $\sqrt{s_{NN}}=$ 5.02 TeV carried out at the Large HadronCollider (LHC) by studying the production and collective flow of identifiedhadrons at intermediate $p_T$ via the coalescence of soft and hard partonsgenerated from viscous hydrodynamics (VISH2+1) and the energy loss model (LBT),respectively. We find that combining the intermediate $p_T$ hadrons from thecoalescence with the low $p_T$ hadrons from hydrodynamics and high $p_T$hadrons from the jet fragmentation, our Hydro-Coal-Frag model provides a nicedescription of the measured $p_T$-spectra and the differential elliptic flow$v_2(p_T)$ of pions, kaons and protons over the $p_T$ range from 0 to 6 GeV. Wefurther demonstrate the necessity of including the quark coalescencecontribution to reproduce the experimentally observed approximate number ofconstituent quark scaling of hadron $v_2$ at intermediate $p_T$. Our resultsthus indicate the importance of partonic degrees of freedom and also hint atthe possible formation of quark-gluon plasma in high multiplicity p+Pbcollisions at the LHC.

Probing the partonic degrees of freedom in high multiplicity p-Pb collisions at $\sqrt{s_{NN}}=$ 5.02 TeV