Studying the jet medium interaction by two particle Δη–Δϕ correlations
✍ Scribed by Chin-Hao Chen
- Publisher
- Elsevier Science
- Year
- 2011
- Tongue
- English
- Weight
- 408 KB
- Volume
- 854
- Category
- Article
- ISSN
- 0375-9474
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✦ Synopsis
We present two-dimensional η-φ inclusive photon-charged hadron correlations measured by the PHENIX experiment. Jet-like correlations are modified in central Au + Au collisions compared to p + p collisions, in both the trigger jet and opposing jet. The trigger jet is elongated in pseudo-rapidity (the "ridge"), while the opposing jet shows a double peak structure ("head" and "shoulder"). We decompose the structures by fitting the η and φ correlations to disentangle components from the medium, the punch-through and the trigger jets. The ridge exists for associated particle p T below 3 GeV/c; it is broad in rapidity and narrow in φ. The away side correlated particle yield is enhanced in central collisions. The yield of the ridge closely resembles the shoulder in the centrality dependence of particle yield and spectra.