Standardized Cumulants of Flow Harmonic Fluctuations

by Dr Seyed Farid Taghavi (School of Particles and Accelerators, IPM)

Wednesday 19 Apr 2017, 15:00 → 16:00 Asia/Tehran

Particles and Accelerators School Seminar Room (Larak)

The outcome of a single event in a typical heavy ion collision includes around ten thousand of particles. The exact value of the number of particles depends on the center of mass energy and the impact parameter of the ions collision. One of the main observables in this experiment is the flow harmonic, v_n, the Fourier harmonic of the particle momentum azimuthal distribution. Even if we extract this distribution from events with almost the same impact parameter and center of mass energy, we find different v_n's due to the event by event fluctuations. We review the fluctuations of initial condition in the heavy ion collisions and its manifestation in the final momentum distribution. After that we shortly study the flow harmonics distribution in many events. In order to study the detail structure of the distribution, we explore the standardized cumulants of it and compare the results with the experimental data. The Gaussian and Power distribution are commonly used for probability distribution p(v_3). Here we will introduce a new distribution for p(v_3) where its deviation from Gaussian is labeled by the standardized cumulants.