High multiplicity events of small colliding systems at high c.m.s. energies show similar collective features as those observed in events
of heavy ion collisions with comparable multiplicities, such as long-range near-side correlations and v_n coefficients [1,2]. Whether this behaviour may be attributed to the presence of a deconfined state in small systems is an open question.
Recent analyses of pp and p-Pb collisions also show an universal enhancement of heavy-flavour particles , that is usually attributed to multiple parton interactions (MPI) and higher gluon radiation associated with short distance production processes [4,5]. While we cannot expect to be able to apply hard probes on the medium created in the collisions of small systems, phenomena like MPI or Color reconnection (CR) may cause a modification of the jet shapes that can in principle be experimentally accessible.
We have carried out extensive studies using Monte Carlo event generators. We give predictions for multiplicity-dependent jet structures, and propose a way to validate the presence and extent of effects such as MPI or Color Reconnection, based on the detection of non-trivial jet shape modification in high multiplicity events. We also propose a definition of a characteristic jet size measure that is independent of multiplicity .
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 S. Porteboeuf, R. Granier de Cassagnac, Nucl.Phys.Proc.Suppl. 214 (2011) 181
 T. Sjostrand, M. van Zijl, Phys.Rev.D 36 (1987) 2019.
 Z.V., https://indico.cern.ch/event/684046/contributions/2809561/attachments/1571304/2478958/Zoltan_Varga_ZimanyiSchool.pdf
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