Speaker
Description
The collisions of small systems at LHC energies exhibit remarkable similarity with heavy-ion collision by far the collectivity concerned. Measurements of anistropic flow coefficients in pp and p-Pb collision at top LHC energies have shown significant magnitude flow coefficients even at low multiplicity, which is generally attributed to collective dynamics in strongly interacting quark-gluon plasma (QGP) produced in heavy-ion collision. However, at low multiplicity non-hydrodynamic components can not be ignored.
Another fascinating signature in heavy-ion collisions that measures the suppression of jet energy as it passes through the medium is the jet quenching. Jets are collimated sprays of particles originating from the fragmentation of highly energetic partons produced in the initial stages of a heavy-ion collision. The suppression of the jet energy is a consequence of the interaction of jets with the Quark-Gluon-Plasma(QGP) medium which reflects the energy loss mechanisms and transport properties of the medium. This phenomena has not been observed in small system collisions till date which has triggered debate whether the observation of anisotropic flow in small systems is actually a manifestation of collective dynamics.
Besides the measurements of modifications of jet yields in heavy-ion collision, measurements of jet-hadron correlations provide a link between the high-momentum probes and the bulk medium which can be used to probe modification of jet fragments, if any due to jet medium interactions. In this work we use multiple parton interaction (MPI) enabled PYTHIA 8 to study near and away side yields and widths of jet-hadron correlations as function of charged particle multiplicity. In absence of any medium, which is the case for PYTHIA8, one would naively expect little or no modifications in the correlation structures, like yields or width as a function of multiplicity thereby providing a baseline expectations for how these quantities would behave in the absence of medium. Any deviation observed in data may indicate other physical processes beyond the standard picture of MPI in pp collisions.
| Field of contribution | Phenomenology |
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