5-11 February 2017
Hyatt Regency Chicago
America/Chicago timezone

Characterizing the away-side jet correlation with robust flow background subtraction in Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}$ = 200 GeV in STAR

Not scheduled
2h 30m
Hyatt Regency Chicago

Hyatt Regency Chicago

151 East Wacker Drive Chicago, Illinois, USA, 60601
Board: L12


Kun Jiang (University of Science and Technology of China)


Jets are modified in relativistic heavy-ion collisions due to jet-medium interactions. Measurements of jet medium modifications have so far been obscured because of the large underlying anisotropic flow background. In this analysis we devise a method to subtract all orders of the flow background using data themselves. The flow background subtracted away-side jet correlation shape and width with respect to a high-$p_T$ trigger particle ($p_{_T}^{\textrm{trig}}>3$ GeV/c) are studied in Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}$ = 200 GeV as a function of centrality and associated particle $p_T$. The correlation shape is consistent with Gaussian. The width is found to increase with centrality except for the lowest measured associated particle $p_T$ bin.

In mid-central ($20$-$60\%$) collisions, the away-side jet correlation is studied as a function of the trigger particle's azimuthal angle relative to the event plane. Event plane dependent effects are expected to arise from jet-medium modifications, event averaging of away-side jets deflected by medium flow, and/or simply nuclear $k_T$ broadening. Results on the event plane angle dependence of the away-side jet correlations are presented.

Collaboration STAR
Preferred Track Jets and High pT Hadrons

Primary author

Kun Jiang (University of Science and Technology of China)

Presentation materials