Morphology of high-multiplicity events in heavy ion collisions

Pavel Nasselski; Christian Holm Christensen; Per Rex Christensen; Poul Henrik Damgaard; Anne Mette Frejsel; Jens Jørgen Gaardhøje; Jaiseung Kim; Alexander Colliander Hansen; Martin Anders Kirstejn Hansen; O. Verkhodanov; U.A. Wiedemann; Per Rex Christensen

Morphology of high-multiplicity events in heavy ion collisions

Pavel Nasselski, Christian Holm Christensen, Per Rex Christensen, Poul Henrik Damgaard, Anne Mette Frejsel, Jens Jørgen Gaardhøje, Jaiseung Kim, Alexander Colliander Hansen, Martin Anders Kirstejn Hansen, O. Verkhodanov, U.A. Wiedemann, Per Rex Christensen

10 Citations (Scopus)

Abstract

We discuss opportunities that may arise from subjecting high-multiplicity events in relativistic heavy ion collisions to an analysis similar to the one used in cosmology for the study of fluctuations of the cosmic microwave background (CMB). To this end, we discuss examples of how pertinent features of heavy ion collisions including global characteristics, signatures of collective flow, and event-wise fluctuations are visually represented in a Mollweide projection commonly used in CMB analysis, and how they are statistically analyzed in an expansion over spherical harmonic functions. If applied to the characterization of purely azimuthal dependent phenomena such as collective flow, the expansion coefficients of spherical harmonics are seen to contain redundancies compared to the set of harmonic flow coefficients commonly used in heavy ion collisions. Our exploratory study indicates, however, that these redundancies may offer novel opportunities for a detailed characterization of those event-wise fluctuations that remain after subtraction of the dominant collective flow signatures. By construction, the proposed approach allows also for the characterization of more complex collective phenomena like higher-order flow and other sources of fluctuations, and it may be extended to the characterization of phenomena of noncollective origin such as jets.

Original language	English
Journal	Physical Review C (Nuclear Physics)
Volume	86
Issue number	2
Pages (from-to)	024916
Number of pages	11
ISSN	0556-2813
Publication status	Published - 30 Aug 2012

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Nasselski, P., Christensen, C. H., Christensen, P. R., Damgaard, P. H., Frejsel, A. M., Gaardhøje, J. J., Kim, J., Hansen, A. C., Hansen, M. A. K., Verkhodanov, O., Wiedemann, U. A., & Christensen, P. R. (2012). Morphology of high-multiplicity events in heavy ion collisions. Physical Review C (Nuclear Physics), 86(2), 024916. http://link.aps.org/doi/10.1103/PhysRevC.86.024916

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title = "Morphology of high-multiplicity events in heavy ion collisions",

abstract = "We discuss opportunities that may arise from subjecting high-multiplicity events in relativistic heavy ion collisions to an analysis similar to the one used in cosmology for the study of fluctuations of the cosmic microwave background (CMB). To this end, we discuss examples of how pertinent features of heavy ion collisions including global characteristics, signatures of collective flow, and event-wise fluctuations are visually represented in a Mollweide projection commonly used in CMB analysis, and how they are statistically analyzed in an expansion over spherical harmonic functions. If applied to the characterization of purely azimuthal dependent phenomena such as collective flow, the expansion coefficients of spherical harmonics are seen to contain redundancies compared to the set of harmonic flow coefficients commonly used in heavy ion collisions. Our exploratory study indicates, however, that these redundancies may offer novel opportunities for a detailed characterization of those event-wise fluctuations that remain after subtraction of the dominant collective flow signatures. By construction, the proposed approach allows also for the characterization of more complex collective phenomena like higher-order flow and other sources of fluctuations, and it may be extended to the characterization of phenomena of noncollective origin such as jets.",

author = "Pavel Nasselski and Christensen, {Christian Holm} and Christensen, {Per Rex} and Damgaard, {Poul Henrik} and Frejsel, {Anne Mette} and Gaardh{\o}je, {Jens J{\o}rgen} and Jaiseung Kim and Hansen, {Alexander Colliander} and Hansen, {Martin Anders Kirstejn} and O. Verkhodanov and U.A. Wiedemann and Christensen, {Per Rex}",

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T1 - Morphology of high-multiplicity events in heavy ion collisions

AU - Nasselski, Pavel

AU - Christensen, Christian Holm

AU - Christensen, Per Rex

AU - Damgaard, Poul Henrik

AU - Frejsel, Anne Mette

AU - Gaardhøje, Jens Jørgen

AU - Kim, Jaiseung

AU - Hansen, Alexander Colliander

AU - Hansen, Martin Anders Kirstejn

AU - Verkhodanov, O.

AU - Wiedemann, U.A.

AU - Christensen, Per Rex

PY - 2012/8/30

Y1 - 2012/8/30

N2 - We discuss opportunities that may arise from subjecting high-multiplicity events in relativistic heavy ion collisions to an analysis similar to the one used in cosmology for the study of fluctuations of the cosmic microwave background (CMB). To this end, we discuss examples of how pertinent features of heavy ion collisions including global characteristics, signatures of collective flow, and event-wise fluctuations are visually represented in a Mollweide projection commonly used in CMB analysis, and how they are statistically analyzed in an expansion over spherical harmonic functions. If applied to the characterization of purely azimuthal dependent phenomena such as collective flow, the expansion coefficients of spherical harmonics are seen to contain redundancies compared to the set of harmonic flow coefficients commonly used in heavy ion collisions. Our exploratory study indicates, however, that these redundancies may offer novel opportunities for a detailed characterization of those event-wise fluctuations that remain after subtraction of the dominant collective flow signatures. By construction, the proposed approach allows also for the characterization of more complex collective phenomena like higher-order flow and other sources of fluctuations, and it may be extended to the characterization of phenomena of noncollective origin such as jets.

AB - We discuss opportunities that may arise from subjecting high-multiplicity events in relativistic heavy ion collisions to an analysis similar to the one used in cosmology for the study of fluctuations of the cosmic microwave background (CMB). To this end, we discuss examples of how pertinent features of heavy ion collisions including global characteristics, signatures of collective flow, and event-wise fluctuations are visually represented in a Mollweide projection commonly used in CMB analysis, and how they are statistically analyzed in an expansion over spherical harmonic functions. If applied to the characterization of purely azimuthal dependent phenomena such as collective flow, the expansion coefficients of spherical harmonics are seen to contain redundancies compared to the set of harmonic flow coefficients commonly used in heavy ion collisions. Our exploratory study indicates, however, that these redundancies may offer novel opportunities for a detailed characterization of those event-wise fluctuations that remain after subtraction of the dominant collective flow signatures. By construction, the proposed approach allows also for the characterization of more complex collective phenomena like higher-order flow and other sources of fluctuations, and it may be extended to the characterization of phenomena of noncollective origin such as jets.

M3 - Journal article

SN - 0556-2813

VL - 86

SP - 024916

JO - Physical Review C (Nuclear Physics)

JF - Physical Review C (Nuclear Physics)

IS - 2

ER -

Morphology of high-multiplicity events in heavy ion collisions

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