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Influence of initial-state momentum anisotropy on the final-state collectivity in small collision systems

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arxiv 1906.01422 v1 pith:TVGKDBDX submitted 2019-06-01 nucl-th hep-phnucl-ex

Influence of initial-state momentum anisotropy on the final-state collectivity in small collision systems

classification nucl-th hep-phnucl-ex
keywords anisotropycollectivitymomentumfinal-stateinitialcollectivecollisiongeometry
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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A multi-phase transport model is used to understand the origin of long-range collective azimuthal correlations in small-system collisions. To disentangle between collectivity associated with initial-state intrinsic momentum anisotropy and the collectivity arising as a final-state response to the collision geometry, we studied the development of collectivity in 5.02 TeV $p$+Pb collisions with both initial-state and final-state effects included. We find that the initial momentum anisotropy may not be fully isotropized through parton interactions, and the final-state partonic collectivity in general are correlated with both the initial momentum anisotropy and the shape of the collision geometry. The initial momentum anisotropy also influences the event by event fluctuation of collective flow. Therefore the mere evidence of geometry response of the collective flow can not rule out the presence of large contributions from the initial state.

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