Azimuthal Anisotropy in U+ U and Au+Au Collisions at RHIC

(STAR Collaboration)

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Collisions between prolate uranium nuclei are used to study how particle production and azimuthal anisotropies depend on initial geometry in heavy-ion collisions. We report the two- and four-particle cumulants, v2{2} and v2{4}, for charged hadrons from U+U collisions at sNN=193 GeV and Au+Au collisions at sNN=200 GeV. Nearly fully overlapping collisions are selected based on the energy deposited by spectators in zero degree calorimeters (ZDCs). Within this sample, the observed dependence of v2{2} on multiplicity demonstrates that ZDC information combined with multiplicity can preferentially select different overlap configurations in U+U collisions. We also show that v2 vs multiplicity can be better described by models, such as gluon saturation or quark participant models, that eliminate the dependence of the multiplicity on the number of binary nucleon-nucleon collisions.

Original languageEnglish
Article number222301
JournalPhysical Review Letters
Volume115
Issue number22
DOIs
StatePublished - Nov 24 2015

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anisotropy
collisions
calorimeters
particle production
quark models
ionic collisions
hadrons
uranium
saturation
nuclei
geometry
configurations
energy

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Azimuthal Anisotropy in U+ U and Au+Au Collisions at RHIC. / (STAR Collaboration).

In: Physical Review Letters, Vol. 115, No. 22, 222301, 24.11.2015.

Research output: Contribution to journalArticle

(STAR Collaboration). / Azimuthal Anisotropy in U+ U and Au+Au Collisions at RHIC. In: Physical Review Letters. 2015 ; Vol. 115, No. 22.
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abstract = "Collisions between prolate uranium nuclei are used to study how particle production and azimuthal anisotropies depend on initial geometry in heavy-ion collisions. We report the two- and four-particle cumulants, v2{2} and v2{4}, for charged hadrons from U+U collisions at sNN=193 GeV and Au+Au collisions at sNN=200 GeV. Nearly fully overlapping collisions are selected based on the energy deposited by spectators in zero degree calorimeters (ZDCs). Within this sample, the observed dependence of v2{2} on multiplicity demonstrates that ZDC information combined with multiplicity can preferentially select different overlap configurations in U+U collisions. We also show that v2 vs multiplicity can be better described by models, such as gluon saturation or quark participant models, that eliminate the dependence of the multiplicity on the number of binary nucleon-nucleon collisions.",
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AU - Campbell, J. M.

AU - Cebra, D.

AU - Cervantes, M. C.

AU - Chakaberia, I.

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