Electrical conductivity of QGP with quasiparticle quarks and Gribov gluon Sadaf Madni, Sumit, Lata Thakur, Najmul Haque European Physical Journal C, 2026 We investigate the electrical conductivity of the quark–gluon plasma (QGP) using a non-perturbative resummation scheme incorporating the Gribov-modified gluon propagator. The electrical conductivity is evaluated by solving the relativistic Boltzmann transport equation within the relaxation-time approximation, where the relaxation times are obtained from microscopic two-body scattering amplitudes. A quasiparticle description is employed for quarks, providing a unified framework for studying transport properties across both weakly and strongly coupled regimes. Above the deconfinement transition temperature, we estimate the electrical conductivity of the QGP and compare our results with available lattice QCD data and various phenomenological models, finding good agreement with the lattice results.
Dynamics of hot QCD matter 2024 - Bulk properties Prabhakar Palni, Amal Sarkar, Santosh K. Das, Anuraag Rathore, Syed Shoaib, Arvind Khuntia, Amaresh Jaiswal, Victor Roy, Ankit Kumar Panda, Partha Bagchi, Hiranmaya Mishra, Deeptak Biswas, Peter Petreczky, Sayantan Sharma, Kshitish Kumar Pradhan, Ronald Scaria, Dushmanta Sahu, Raghunath Sahoo, Arpan Das, Ranjita K. Mohapatra, Jajati K. Nayak, Rupa Chatterjee, Munshi G. Mustafa, K. R. Aswathy Menon, Suraj Prasad, Neelkamal Mallick, Pushpa Panday, Binoy Krishna Patra, Paramita Deb, Raghava Varma, Ashutosh Dwibedi, Thandar Zaw Win, Subhalaxmi Nayak, Cho Win Aung, Sabyasachi Ghosh, Sesha Vempati, Sunny Kumar Singh, Manu Kurian, Vinod Chandra, Soham Banerjee, Sumit, Rohit Kumar, Rajkumar Mondal, Nilanjan Chaudhuri, Pradip Roy, Sourav Sarkar, Lokesh Kumar, authors International Journal of Modern Physics E, 2025 The second Hot QCD Matter 2024 conference at IIT Mandi focused on various ongoing topics in high-energy heavy-ion collisions, encompassing theoretical and experimental perspectives. This proceedings volume includes 19 contributions that collectively explore diverse aspects of the bulk properties of hot QCD matter. The topics encompass the dynamics of electromagnetic fields, transport properties, hadronic matter, spin hydrodynamics, and the role of conserved charges in high-energy environments. These studies significantly enhance our understanding of the complex dynamics of hot QCD matter, the quark–gluon plasma (QGP) formed in high-energy nuclear collisions. Advances in theoretical frameworks, including hydrodynamics, spin dynamics and fluctuation studies, aim to improve theoretical calculations and refine our knowledge of the thermodynamic properties of strongly interacting matter. Experimental efforts, such as those conducted by the ALICE and STAR collaborations, play a vital role in validating these theoretical predictions and deepening our insight into the QCD phase diagram, collectivity in small systems, and the early-stage behavior of strongly interacting matter. Combining theoretical models with experimental observations offers a comprehensive understanding of the extreme conditions encountered in relativistic heavy-ion and proton-proton collisions.
Heavy quark dynamics via the Gribov-Zwanziger approach Sumit, Arghya Mukherjee, Najmul Haque, Binoy Krishna Patra Physical Review D, 2024 In this work, we investigate the momentum-dependent drag and diffusion coefficient of heavy quarks (HQs) moving in the quark-gluon plasma background. The leading order scattering amplitudes required for this purpose have been obtained using the Gribov-Zwanziger propagator for the mediator gluons to incorporate the nonperturbative effects relevant to the phenomenologically accessible temperature regime. The drag and diffusion coefficients so obtained have been implemented to estimate the temperature and momentum dependence of the energy loss of the HQ as well as the temperature dependence of the specific shear viscosity (η/s) of the background medium. Our results suggest a higher energy loss of the propagating HQ compared to the perturbative estimates, whereas the η/s is observed to comply with the AdS/CFT estimation over a significantly wider temperature range compared to the perturbative expectation. Published by the American Physical Society 2024
QCD mesonic screening masses using Gribov quantization Sumit, Najmul Haque, Binoy Krishna Patra Physics Letters Section B Nuclear Elementary Particle and High Energy Physics, 2023 The screening masses of mesons provide a gauge invariant and definite order parameter of chiral symmetry restoration. Different mesonic correlation lengths for flavor non-singlets, at least up to NLO, are well-defined gauge invariant physical quantities calculated earlier using the perturbative resummation techniques. The NLO perturbative results match the available non-perturbative lattice QCD results at the high-temperature regime. We have studied the spatial correlation lengths of various mesonic observables using the non-perturbative Gribov resummation, both for quenched QCD and (2+1) flavor QCD. The study follows the analogies with the NRQCD effective theory, a well-known theory for studying heavy quarkonia at zero temperature.
NLO quark self-energy and dispersion relation using the hard thermal loop resummation Sumit, Najmul Haque, Binoy Krishna Patra Journal of High Energy Physics, 2023 Using the hard-thermal-loop (HTL) resummation in real-time formalism, we study the next-to-leading order (NLO) quark self-energy and corresponding NLO dispersion laws. In NLO, we have replaced all the propagators and vertices with the HTL-effective ones in the usual quark self-energy diagram. Additionally, a four-point vertex diagram also contributes to the quark NLO self-energy. We calculate the usual quark self-energy diagram and the four-point vertex diagram separately. Using those, we express the NLO quark self-energy in terms of the three- and four-point HTL-effective vertex functions. Using the Feynman parametrization, we express the integrals containing the three- and four-point HTL effective vertex functions in terms of the solid angles. After completing the solid angle integrals, we numerically calculate the momentum integrals in the NLO quark self-energy and plot them as a function of the ratio of momentum and energy. Using the NLO quark self-energy, we plot the NLO correction to dispersion laws.
Dynamics of hot QCD matter - Current status and developments Santosh K. Das, Prabhakar Palni, Jhuma Sannigrahi, Jan-e Alam, Cho Win Aung, Yoshini Bailung, Debjani Banerjee, Gergely Gábor Barnaföldi, Subash Chandra Behera, Partha Pratim Bhaduri, Samapan Bhadury, Rajesh Biswas, Pritam Chakraborty, Vinod Chandra, Prottoy Das, Sadhana Dash, Saumen Datta, Sudipan De, Vaishnavi Desai, Suman Deb, Debarshi Dey, Jayanta Dey, Sabyasachi Ghosh, Najmul Haque, Mujeeb Hasan, Amaresh Jaiswal, Sunil Jaiswal, Chitrasen Jena, K K Gowthama, Salman Ahamad Khan, Lokesh Kumar, Sumit Kumar Kundu, Manu Kurian, Neelkamal Mallick, Aditya Nath Mishra, Sukanya Mitra, Lakshmi J. Naik, Sonali Padhan, Ankit Kumar Panda, Pushpa Panday, Suvarna Patil, Binoy Krishna Patra, Pooja, Raghunath Pradhan, Girija Sankar Pradhan, Jai Prakash, Suraj Prasad, Prabhat R. Pujahari, Shubhalaxmi Rath, Sudhir Pandurang Rode, Ankhi Roy, Victor Roy, Marco Ruggieri, V. S. Rohan, Raghunath Sahoo, Nihar Ranjan Sahoo, Dushmanta Sahu, Nachiketa Sarkar, Sreemoyee Sarkar, Sarthak Satapathy, Captain R. Singh, V. Sreekanth, K. Sreelakshmi, Sumit, Dhananjaya Thakur, Sushanta Tripathy, Thandar Zaw Win, authors International Journal of Modern Physics E, 2022 The discovery of hot and dense quantum chromodynamics (QCD) matter, known as Quark–Gluon Plasma (QGP), is an essential milestone in understanding the finite temperature QCD medium. Experimentalists around the world collect an unprecedented amount of data in heavy ion collisions, at Relativistic Heavy Ion Collider (RHIC), at Brookhaven National Laboratory (BNL) in New York, USA, and at the Large Hadron Collider (LHC), at CERN in Geneva, Switzerland. The experimentalists analyze these data to unravel the mystery of this new phase of matter that filled a few microseconds old universe just after the Big Bang. Recent advancements in theory, experimental techniques, and high computing facilities help us to better interpret experimental observations in heavy ion collisions. The exchange of ideas between experimentalists and theorists is crucial for the characterization of QGP. The motivation of this first conference, named Hot QCD Matter 2022 is to bring the community together to have a discourse on this topic. In this paper, there are 36 sections discussing various topics in the field of relativistic heavy ion collisions and related phenomena that cover a snapshot of the current experimental observations and theoretical progress. This paper begins with the theoretical overview of relativistic spin-hydrodynamics in the presence of the external magnetic field, followed by the Lattice QCD results on heavy quarks in QGP. Finally, it concludes with an overview of experimental results.
RECENT SCHOLAR PUBLICATIONS
Thermodynamics of strongly magnetized dense quark matter from hard dense loop perturbation theory S Satapathy, Sumit, SA Khan Phys. Rev. D 111, 116025 , 2025 2025 Citations: 1
Anisotropy effects on heavy quark dynamics in Gribov modified gluon plasma Sumit, J Parkash, SK Das, N Haque arXiv preprint arXiv:2506.01922 , 2025 2025
Dynamics of Hot QCD Matter 2024--Bulk Properties P Palni, A Sarkar, SK Das, A Rathore, S Shoaib, A Khuntia, A Jaiswal, ... International Journal of Modern Physics E 34 (97), 2544002 , 2024 2024 Citations: 9
Heavy quark dynamics via Gribov-Zwanziger approach Sumit, A Mukherjee, N Haque, BK Patra Phys. Rev. D 109, 114043 , 2023 2023 Citations: 5
QCD mesonic screening masses using Gribov quantization Sumit, N Haque, BK Patra Phys.Lett.B 845 (2023) 138143 , 2023 2023 Citations: 11
NLO quark self-energy and dispersion relation using the hard thermal loop resummation Sumit, N Haque, BK Patra Journal of High Energy Physics 2023 (5), 1-41 , 2023 2023 Citations: 2
Dynamics of hot QCD matter—Current status and developments SK Das, P Palni, J Sannigrahi, JE Alam, CW Aung, Y Bailung, D Banerjee, ... International Journal of Modern Physics E 31 (12), 2250097 , 2022 2022 Citations: 35
MOST CITED SCHOLAR PUBLICATIONS
Dynamics of hot QCD matter—Current status and developments SK Das, P Palni, J Sannigrahi, JE Alam, CW Aung, Y Bailung, D Banerjee, ... International Journal of Modern Physics E 31 (12), 2250097 , 2022 2022 Citations: 35
QCD mesonic screening masses using Gribov quantization Sumit, N Haque, BK Patra Phys.Lett.B 845 (2023) 138143 , 2023 2023 Citations: 11
Dynamics of Hot QCD Matter 2024--Bulk Properties P Palni, A Sarkar, SK Das, A Rathore, S Shoaib, A Khuntia, A Jaiswal, ... International Journal of Modern Physics E 34 (97), 2544002 , 2024 2024 Citations: 9
Heavy quark dynamics via Gribov-Zwanziger approach Sumit, A Mukherjee, N Haque, BK Patra Phys. Rev. D 109, 114043 , 2023 2023 Citations: 5
NLO quark self-energy and dispersion relation using the hard thermal loop resummation Sumit, N Haque, BK Patra Journal of High Energy Physics 2023 (5), 1-41 , 2023 2023 Citations: 2
Thermodynamics of strongly magnetized dense quark matter from hard dense loop perturbation theory S Satapathy, Sumit, SA Khan Phys. Rev. D 111, 116025 , 2025 2025 Citations: 1
Anisotropy effects on heavy quark dynamics in Gribov modified gluon plasma Sumit, J Parkash, SK Das, N Haque arXiv preprint arXiv:2506.01922 , 2025 2025
