Aug 12 – 18, 2012
US/Eastern timezone

If you have any questions about the details of the program please contact Bolek Wyslouch

Investigating the ridge structure in #Delta#eta-#Delta#phi correlations at STAR

Aug 16, 2012, 4:00 PM
Regency 1/3 and Ambassador

Regency 1/3 and Ambassador

Poster Correlations and fluctuations Poster Session Reception


Mr L. Chanaka De Silva (University of Houston)


Triggered di-hadron correlation studies using Au+Au collisions at #sqrt(S_{NN}) = 200GeV in STAR revealed a novel “ridge-like” structure in two dimensions (#Delta#eta, #Delta#phi) [1] for high p_{T} particles. Similar structure was also present in an inclusive un-triggered di-hadron correlation analysis [2]. We study the <p_{T}> evolution of un-triggered analysis by increasing the lower p_{T} cut of both charged particles. A smooth evolution of data is observed and our results reproduce the initial triggered analysis structure near <p_{T}> = 2.7 GeV/c. We further quantify the correlation structure evolution by fitting a model function. The model function emphasizes possible initial state fluctuation contribution via the use of higher harmonic model components; v_{n} (n=1,2,3,4) and the remainder is modeled via an asymmetric 2d Gaussian. Extracted harmonic parameters are compared to model predictions [3,4] and remainder is quantified via p+p data at #sqrt(S_{NN}) = 200GeV and charge dependent studies. [1] B. I. Abelev et al. (STAR Collaboration), Phys. Rev. C 80, 064912 (2009) [2] M Daugherity et al. (STAR Collaboration), J. Phys. G 35, 104090 (2008) [3] B. Alver et al., Phys. Rev. C 81, 054905 (2010) [4] C. Gombeaud et al., Phys. Rev. C 81, 014901 (2010)

Primary author

Mr L. Chanaka De Silva (University of Houston)

Presentation materials