Color Screening from Flux Tube in (2 + 1)-Flavour QCD

We measure the flux tube produced by quark-antiquark pair in (2 + 1) flavour QCD with physical mass at high temperature. To increase the signal over noise ratio, we apply the Gradient flow method. In this study, we analyse the dependence of the penetration length and the effective mass, the flux tube width and the free energy on temperature and separation. From the results of the non-vanishing penetration length and effective mass, we observe screening of the color electric field. The free energy exhibits that the screening phenomenon depends on interquark distance and temperature. For width of the flux tube, we observe quantum widening up to fm at all temperatures which are in close vicinity to the deconfinement transition temperature .