Transverse Momentum and Centrality Dependence of Dihadron Correlations in Au+Au Collisions at s_NN = 200 GeV: Jet Quenching and the Response of Partonic Matter

Journal Article · Tue Jan 01 00:00:00 EST 2008 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.77.011901· OSTI ID:931173

Adare, A. ^[1]; Awes, Terry C ^[2]; Cianciolo, Vince ^[2]; Efremenko, Yuri ^[3]; Read, Jr, Kenneth F ^[2]; Silvermyr, David O ^[2]; Sorensen, Soren P ^[4]; Stankus, Paul W ^[2]; Young, Glenn R ^[2]

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1. University of Colorado, Boulder
2. ORNL
3. University of Tennessee, Knoxville (UTK) & Oak Ridge National Laboratory (ORNL)
4. University of Tennessee, Knoxville (UTK)

Azimuthal angle {Delta}{phi} correlations are presented for charged hadrons from dijets for 0.4 < p{sub T} < 10 GeV/c in Au+Au collisions at {radical}(s{sub NN}) = 200 GeV. With increasing p{sub T}, the away-side distribution evolves from a broad to a concave shape, then to a convex shape. Comparisons to p+p data suggest that the away-side can be divided into a partially suppressed 'head' region centered at {Delta}{phi} {approx} {pi}, and an enhanced 'shoulder' region centered at {Delta}{phi} {approx} {pi} {+-} 1.1. The p{sub T} spectrum for the 'head' region softens toward central collisions, consistent with the onset of jet quenching. The spectral slope for the 'shoulder' region is independent of centrality and trigger p{sub T}, which offers constraints on energy transport mechanisms and suggests that the 'shoulder' region contains the medium response to energetic jets.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 931173
• Journal Information: Physical Review C, Vol. 77, Issue 1; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
DISTRIBUTION
HADRONS
QUENCHING
SHAPE
TRANSVERSE MOMENTUM
JETS