Two-particle correlations with identified triggers in $p$-Pb collisions at $\sqrt{s_{\mathit{NN}}}=5.02$ TeV using a multiphase transport model

We report calculations regarding recent measurements of near-side jetlike yields obtained from the angular correlations with pions and protons as trigger particles and unindentified charged hadrons as associated at intermediate transverse momentum ($p_T$). Events generated from the string melting version of a multiphase transport model (AMPT) and HIJING are analyzed to calculate the near-side jetlike yields associated with pion and proton triggers in $p$-Pb collisions at 5.02 TeV. Multiplicity dependence of the near-side jetlike yield is studied by subtracting the so-called long-range correlations. In $A-A$ collisions, at intermediate $p_T$, jetlike yield associated with baryon trigger shows a gradual suppression from peripheral to central events following an initial rise. This suppression was interpreted as a combined effect of parton energy loss due to jet-quenching and particle production via quark recombination generating anomalous baryon to meson enhancement at intermediate $p_T$. Similar enhancement was also observed in small collision systems like $p$-Pb at CERN Large Hadron Collider (LHC) energy. In absence of any significant jet-medium interplay in small systems, trigger species dependence of the associated jetlike yield may be attributed dominantly to the dynamics of quark coalescence and/or radial flow. The multiplicity evolution of the trigger species dependence of jetlike yields, obtained from AMPT, found to be completely different from the same when extracted from a hydrodynamical model, EPOS. With the data available at LHC, these results may be tested to achieve further insight on the underlying dynamics in small collision systems, and the mechanism of hadronization at intermediate $p_T$ as well.

Figure 1

Inclusive proton over pion ratio as obtained from AMPT SM in 0–10% and 60–100% event classes (a) without and (b) with ART.

Figure 2

Two-particle $\mathrm{\Delta }\eta -\mathrm{\Delta }\phi$ correlation function in 0–10% event class of $p$-Pb collisions at $\sqrt{s_{\mathit{NN}}}=5.02$ TeV from AMPT SM (with ART) with (a) pion and (b) proton as trigger particles.

Figure 3

(a) The $\mathrm{\Delta }\phi$ projected correlation function for AMPT SM case for two $\mathrm{\Delta }\eta$ regions referred to as jet (blue) and bulk (red). (b) The $\mathrm{\Delta }\phi$ projected correlation function after bulk subtraction as discussed in the text.

Figure 4

(a) Multiplicity dependence of the near-side jet like per trigger yield (bulk subtracted) associated with pion and proton triggers in $p$-Pb collisions at $\sqrt{s_{\mathit{NN}}}=5.02$ TeV from HIJING. (b) Multiplicity dependence of the ratio of the near-side jet like per trigger yield (bulk subtracted) associated with proton and pion triggers.

Figure 5

(a) Multiplicity dependence of the near-side jetlike per trigger yield (bulk subtracted) associated with pion and proton triggers in $p$-Pb collisions at $\sqrt{s_{\mathit{NN}}}=5.02$ TeV from AMPT SM without hadronic cascade. (b) Multiplicity dependence of the ratio of the near-side jetlike per trigger yield (bulk subtracted) associated with proton and pion triggers.

Figure 6

(a) Multiplicity dependence of the near-side jetlike per trigger yield (bulk subtracted) associated with pion and proton triggers in $p$-Pb collisions at $\sqrt{s_{\mathit{NN}}}=5.02$ TeV from AMPT SM with hadronic cascade on. (b) Multiplicity dependence of the ratio of the near-side jetlike per trigger yield (bulk subtracted) associated with proton and pion triggers.