Semihard scattering unraveled from collective dynamics by two-pion azimuthal correlations in 158A GeV/c Pb+Au collisions
Result description
Elliptic flow and two-particle azimuthal correlations of charged hadrons and high-p(T) pions (p(T)>1 GeV/c) have been measured close to midrapidity in 158A GeV/c Pb+Au collisions by the CERES experiment. Elliptic flow (v(2)) rises linearly with p(T) to avalue of about 10% at 2 GeV/c. Beyond p(T)approximate to1.5 GeV/c, the slope decreases considerably, possibly indicating a saturation of v(2) at high p(T). Two-pion azimuthal anisotropies for p(T)>1.2 GeV/c exceed the elliptic flow values by about 60% in midcentral collisions. These nonflow contributions are attributed to nearside and back-to-back jetlike correlations, the latter exhibiting centrality dependent broadening.
Keywords
The result's identifiers
Result code in IS VaVaI
Result on the web
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DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
Semihard scattering unraveled from collective dynamics by two-pion azimuthal correlations in 158A GeV/c Pb+Au collisions
Original language description
Elliptic flow and two-particle azimuthal correlations of charged hadrons and high-p(T) pions (p(T)>1 GeV/c) have been measured close to midrapidity in 158A GeV/c Pb+Au collisions by the CERES experiment. Elliptic flow (v(2)) rises linearly with p(T) to avalue of about 10% at 2 GeV/c. Beyond p(T)approximate to1.5 GeV/c, the slope decreases considerably, possibly indicating a saturation of v(2) at high p(T). Two-pion azimuthal anisotropies for p(T)>1.2 GeV/c exceed the elliptic flow values by about 60% in midcentral collisions. These nonflow contributions are attributed to nearside and back-to-back jetlike correlations, the latter exhibiting centrality dependent broadening.
Czech name
Semi-tvrdý rozptyl vydělený z kolektivní dynamiky pomocí dvoučásticových azimutálních korelací p mezonů v Pb-Au srážkách při 158 GeV na nukleon
Czech description
Eliptický tok a dvoučásticové azimutální korelace byly měřeny experimentem CERES pro nabité hadrony a p mezony s příčným impulsem ? 1 GeV/c poblíž centrální rapidity. Pro příčné impulsy ? 1.5 GeV/c klesá sklon nárůstu koeficientu v2, což naznačuje saturaci v2 pro vysoké příčné impulsy. Dvoupionové azimutální anizotropie převyšují eliptický tok o přibližně 60% ve středně centrálních srážkách. Tato složka je spojována s jetu-podobnými korelacemi v blízkém a protilehlém kónu. Protilehlý kónus vykazuje rozšíření v závislosti na centralitě.
Classification
Type
Jx - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BG - Nuclear, atomic and molecular physics, accelerators
OECD FORD branch
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Result continuities
Project
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2004
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Physical Review Letters
ISSN
0031-9007
e-ISSN
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Volume of the periodical
92
Issue of the periodical within the volume
3
Country of publishing house
US - UNITED STATES
Number of pages
1
Pages from-to
032301
UT code for WoS article
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EID of the result in the Scopus database
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Basic information
Result type
Jx - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP
BG - Nuclear, atomic and molecular physics, accelerators
Year of implementation
2004