Exploring origins for correlations between flow harmonics and transverse momentum in small collision systems
Abstract
High statistics data sets from experiments at the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC) with small and large collision species have enabled a wealth of new flow measurements, including the event-by-event correlation between observables. One exciting such observable $$ρ(v^2_n, [p_T])$$ gauges the correlation between the mean transverse momentum of particles in an event and the various flow coefficients (vn) in the same event [P. Bozek, Phys. Rev. C 93, 044908 (2016)]. Recently it has been proposed that very low multiplicity events may be sensitive to initial-state glasma correlations [G. Giacalone, B. Schenke, and C. Shen, Phys. Rev. Lett. 125, 192301 (2020)] rather than flow-related dynamics. We find utilizing the ip-jazma framework that the color domain explanation for the glasma results are incomplete. We then explore predictions from pythia8, and the version for including nuclear collisions called pythia-angantyr, which have only nonflow correlations, and from the ampt model which has both nonflow and flow-type correlations. We find that pythia-angantyr has nonflow contributions to $$ρ(v^2_n, [p_T])$$ in p + O, p + Pb, and O + O collisions that are positive at low multiplicity and comparable to the glasma correlations. It is striking that in pythia8 in p + p collisions there is actually a sign change from positive to negative $$ρ(v^2_n, [p_T])$$ as a function of multiplicity. The ampt results match the experimental data general trends in Pb+Pb collisions at the LHC, except at low multiplicity where ampt has the opposite sign. In p + Pb collisions, ampt has the opposite sign from experimental data and we explore this within the context of parton geometry. Predictions for p + O, O + O, and Xe + Xe are also presented.
- Authors:
-
[1];
[2]
- Pusan National Univ., Busan (Korea, Republic of)
- Univ. of Colorado, Boulder, CO (United States)
- Publication Date:
- Research Org.:
- Columbia Univ., New York, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Nuclear Physics (NP); National Research Foundation of Korea (NRF)
- OSTI Identifier:
- 1849355
- Grant/Contract Number:
- FG02-00ER41152; 2020R1C1C1004985
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. C
- Additional Journal Information:
- Journal Volume: 103; Journal Issue: 6; Journal ID: ISSN 2469-9985
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; physics; collective flow; particle correlations & fluctuations; relativistic heavy-ion collisions
Citation Formats
Lim, S. H., and Nagle, J. L. Exploring origins for correlations between flow harmonics and transverse momentum in small collision systems. United States: N. p., 2021.
Web. doi:10.1103/physrevc.103.064906.
Lim, S. H., & Nagle, J. L. Exploring origins for correlations between flow harmonics and transverse momentum in small collision systems. United States. https://doi.org/10.1103/physrevc.103.064906
Lim, S. H., and Nagle, J. L. Mon .
"Exploring origins for correlations between flow harmonics and transverse momentum in small collision systems". United States. https://doi.org/10.1103/physrevc.103.064906. https://www.osti.gov/servlets/purl/1849355.
@article{osti_1849355,
title = {Exploring origins for correlations between flow harmonics and transverse momentum in small collision systems},
author = {Lim, S. H. and Nagle, J. L.},
abstractNote = {High statistics data sets from experiments at the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC) with small and large collision species have enabled a wealth of new flow measurements, including the event-by-event correlation between observables. One exciting such observable $ρ(v^2_n, [p_T])$ gauges the correlation between the mean transverse momentum of particles in an event and the various flow coefficients (vn) in the same event [P. Bozek, Phys. Rev. C 93, 044908 (2016)]. Recently it has been proposed that very low multiplicity events may be sensitive to initial-state glasma correlations [G. Giacalone, B. Schenke, and C. Shen, Phys. Rev. Lett. 125, 192301 (2020)] rather than flow-related dynamics. We find utilizing the ip-jazma framework that the color domain explanation for the glasma results are incomplete. We then explore predictions from pythia8, and the version for including nuclear collisions called pythia-angantyr, which have only nonflow correlations, and from the ampt model which has both nonflow and flow-type correlations. We find that pythia-angantyr has nonflow contributions to $ρ(v^2_n, [p_T])$ in p + O, p + Pb, and O + O collisions that are positive at low multiplicity and comparable to the glasma correlations. It is striking that in pythia8 in p + p collisions there is actually a sign change from positive to negative $ρ(v^2_n, [p_T])$ as a function of multiplicity. The ampt results match the experimental data general trends in Pb+Pb collisions at the LHC, except at low multiplicity where ampt has the opposite sign. In p + Pb collisions, ampt has the opposite sign from experimental data and we explore this within the context of parton geometry. Predictions for p + O, O + O, and Xe + Xe are also presented.},
doi = {10.1103/physrevc.103.064906},
journal = {Physical Review. C},
number = 6,
volume = 103,
place = {United States},
year = {Mon Jun 14 00:00:00 EDT 2021},
month = {Mon Jun 14 00:00:00 EDT 2021}
}
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