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Importance of initial and final state effects for azimuthal correlations in p+Pb collisions

Moritz Greif
(
- Frankfurt U.
)
,
Carsten Greiner
(
- Frankfurt U.
)
,
Björn Schenke
(
- Brookhaven
)
,
Sören Schlichting
(
- Washington U., Seattle
)
,
Zhe Xu
(
- Tsinghua U., Beijing
)

Feb 18, 2019

4 pages

Part of Proceedings, 27th International Conference on Ultrarelativistic Nucleus-Nucleus Collisions (Quark Matter 2018) : Venice, Italy, May 14-19, 2018, 491-494

Published in:

Nucl.Phys.A 982 (2019) 491-494

Contribution to:

- Quark Matter 2018
, 491-494

Published: Feb, 2019

e-Print:

1903.00314 [nucl-th]

DOI:

10.1016/j.nuclphysa.2018.10.055

View in:

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Abstract: (Elsevier)

We study the influence and interplay of initial state and final state effects in the dynamics of small systems, focusing on azimuthal correlations at different multiplicities. To this end we introduce a new model, matching the classical Yang-Mills dynamics of pre-equilibrium gluon fields (IP-GLASMA) to a perturbative QCD based parton cascade for the final state evolution (BAMPS) on an event-by-event basis. Depending on multiplicity of the event, we see transverse momentum dependent signatures of the initial, but also the final state in azimuthal correlation observables, such as v 2 {2 PC }( p T ). In low-multiplicity events, initial state correlations dominate for transverse momenta p T > 2 GeV, whereas in high-multiplicity events and at low momenta final state interactions dominate and initial state correlations strongly affect v 2 {2 PC }( p T ) for p T > 2 GeV as well as the p T integrated v 2 {2 PC }. Nearly half of the final pT integrated v 2 {2 PC } is contributed by the initial state in low-multiplicity events, whereas in high-multiplicity the share is much less. Based on Ref. [M. Greif, C. Greiner, B. Schenke, S. Schlichting, Z. Xu, Phys. Rev. D96 (9) (2017) 091504], we are now able to carry out a systematic multiplicity scan, probing the dynamics on the border of initial state dominated to final state dominated – but not yet hydrodynamic regime.

Note:

Proceedings XXVIIth International Conference on Ultrarelativistic Nucleus-Nucleus Collisions (Quark Matter 2018)

Parton cascade BAMPS
IPGLASMA
Initial state
Final state
Small systems
initial state: correlation
p nucleus: scattering
parton: cascade
multiplicity: difference
momentum: low

References(16)

Figures(3)

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(
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)
,
Carsten Greiner
(
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,
Björn Schenke
(
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)
,
Sören Schlichting
(
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)
,
Zhe Xu
(
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)

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•
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)
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CMS

Collaboration

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Serguei Chatrchyan
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