Speaker
Rupa Chatterjee
Description
We calculate elliptic and triangular flow of thermal photons for different collision centralities at RHIC using event–by-event hydrodynamic model with fluctuating initial conditions. Photon $v_3$ as a function of $p_T$ calculated with respect to the participant plane angle is found to be comparable to the elliptic flow parameter $v_2(p_T)$ for 0—20% centrality bin at RHIC. However, $v_2(p_T)$ rises much faster than $v_3(p_T)$ towards peripheral collisions and $v_3(p_T)$ is found to be largest for 20—40% centrality bin.
We study the event-by-event distributions of $v_2$ and $v_3$ and their corresponding initial state anisotropies to understand the correlation between them. A significant linear correlation between $v_2$ and $\epsilon_2$ is observed at different $p_T$ values, however we do not see any correlation between photon $v_3$ and the initial triangularity $\epsilon_3$. This is unlike the case of hadrons where a clear mapping between hadronic $v_3$ and $\epsilon_3$ has been observed. We conclude that indirect effects of initial state fluctuations, such as buildup of large transverse flow velocity contribute significantly to the observed $v_3$ results beyond leading to an overall triangular geometry.
| On behalf of collaboration: | NONE |
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Author
Rupa Chatterjee
Co-authors
Dinesh Srivastava
(Variable Energy Cyclotron Centre, Kolkata)
Mr
Pingal Dasgupta
(Variable Energy Cyclotron Centre)
