Lattice NRQCD study on in-medium bottomonium spectra using a novel Bayesian reconstruction approach

Abstract

We present recent results on the in-medium modification of S- and P-wave bottomonium states around the deconfinement transition. Our study uses lattice QCD with $N_f=2+1$ light quark flavors to describe the non-perturbative thermal QCD medium between $140$MeV$<T<249$MeV and deploys lattice regularized non-relativistic QCD (NRQCD) effective field theory to capture the physics of heavy quark bound states immersed therein. The spectral functions of the ${}^3{S}_1$ $({\rm Y})$ and ${}^3{P}_1$ $({\chi }_{b1})$ bottomonium states are extracted from Euclidean time Monte Carlo simulations using a novel Bayesian prescription, which provides higher accuracy than the Maximum Entropy Method. Based on a systematic comparison of interacting and free spectral functions we conclude that the ground states of both the S-wave $({\rm Y})$ and P-wave $({\chi }_{b1})$ channel survive up to $T=249$MeV. Stringent upper limits on the size of the in-medium modification of bottomonium masses and widths are provided.

8 pages, 8 figures, Talk given at the 11th International Conference on Quark Confinement and the Hadron Spectrum 2014, St. Petersburg, Russia

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