24-30 July 2016
Highfield Campus, University of Southampton
Europe/London timezone

Stochastic reconstruction of charmonium spectral functions at finite temperature

28 Jul 2016, 15:00
20m
Building 32 Room 1015 (Highfield Campus, University of Southampton)

Building 32 Room 1015

Highfield Campus, University of Southampton

Talk Nonzero Temperature and Density Nonzero Temperature and Density

Speaker

Dr Hiroshi Ohno (University of Tsukuba)

Description

We study charmonium spectral functions at finite temperature by using stochastic reconstruction methods. Our quenched lattice QCD simulations are performed with the standard plaquette gauge and the $O(a)$-improved Wilson fermion actions on 192$^3 \times N_\tau$ lattices with $N_\tau$ = 96--32, which corresponds to temperatures from 0.73$T_c$ to 2.2$T_c$. To reconstruct the charmonium spectral functions for the Euclidean time correlators we apply two different stochastic methods called Stochastic Analytical Inference (SAI) and Stochastic Optimization Method (SOM), where the former is based on the Bayes' theorem similar to commonly used Maximum Entropy Method (MEM) while the latter does not rely on any prior information. We carefully estimate systematic uncertainties by comparing results among SAI, SOM and also MEM. With the given spectral functions we discuss melting temperatures of charmonia as well as the heavy quark diffusion coefficient.

Primary author

Dr Hiroshi Ohno (University of Tsukuba)

Co-authors

Mr Haitao Shu (CCNU) Dr Heng Tong Ding (CCNU) Dr Olaf Kaczmarek (University of Bielefeld) Dr Swagato Mukherjee (BNL)

Presentation Materials