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Sushant Kumar Singh received the best Young Physicist Award in the Young Physicist Colloquium 2023


Dr. Sushant Kumar Singh has been awarded the prestigious S.N. Ghosal Award for being recognized as the best Young Physicist at the Young Physicists' Colloquium 2023. The event, hosted by the Indian Physical Society, took place during August 24-25, 2023, at Saha Institute of Nuclear Physics. Out of 52 applications from across the country, Dr. Singh was one of the 17 young physicists under the age of 35 who presented their research work at the Colloquium. Dr. Singh's presentation was titled "Spin Polarization of Lambda Hyperons as an Indicator of QCD Critical Point."

The research addresses one of the outstanding problems in physics - locating the critical point in the Quantum Chromodynamics (QCD) phase diagram. Dr. Singh's collaborative study with Prof. Jane Alam shows that the suppression in the rapidity distribution of spin polarization of Lambda hyperons can serve as a potential indicator of the QCD critical point. In the high-energy collisions of heavy ions, a fireball of quarks and gluons is created. This fireball possesses significant angular momentum that is conserved in the absence of external torques. As the fireball decays into hadrons, the net polarization aligns itself with the angular momentum direction. The magnitude of the spin polarization observed in experiments depends on the time evolution of local vortices within the fluid-like fireball, which is influenced by transport properties such as shear and bulk viscosity. Dr. Singh's research findings suggest that near the critical point, the enhanced viscosity of the fluid leads to faster dissipation of local vortices, resulting in the predicted suppression of spin polarization.  The main findings of this work are published in Eur. Phys. J. C (2023) 83:585, along with complementary results in Phys. Rev. D 107, 074042 (2023).