Santosh K. Das
A5004463482- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- Fusion materials and technologies
- Ion-surface interactions and analysis
- Nuclear Materials and Properties
- Cosmology and Gravitation Theories
- Nuclear Physics and Applications
- Pulsars and Gravitational Waves Research
- High-Velocity Impact and Material Behavior
- Nuclear materials and radiation effects
- Nuclear reactor physics and engineering
- Laser-Plasma Interactions and Diagnostics
- Integrated Circuits and Semiconductor Failure Analysis
- Dark Matter and Cosmic Phenomena
- Superconducting Materials and Applications
- Black Holes and Theoretical Physics
- High-Temperature Coating Behaviors
- Particle Detector Development and Performance
- Infection Control and Ventilation
- Metal and Thin Film Mechanics
- Stochastic processes and statistical mechanics
- Populism, Right-Wing Movements
- Statistical Mechanics and Entropy
- Housing, Finance, and Neoliberalism
Indian Institute of Technology Goa
2018-2025
Purdue University West Lafayette
2018-2024
Institute for Human Development
2023
Malaviya National Institute of Technology Jaipur
2021
Indian Institute of Technology Bombay
2021
Indian Institute of Technology Gandhinagar
2020-2021
Indian Institute of Technology Indore
2021
European Organization for Nuclear Research
2021
University of Catania
2013-2020
Variable Energy Cyclotron Centre
2005-2020
The results from the STAR Collaboration on directed flow (${v}_{1}$), elliptic (${v}_{2}$), and fourth harmonic (${v}_{4}$) in anisotropic azimuthal distribution of particles Au+Au collisions at $\sqrt{{s}_{\mathit{NN}}}=200\phantom{\rule{0.3em}{0ex}}\mathrm{GeV}$ are summarized compared with other experiments theoretical models. Results for identified presented fit a blast-wave model. Different analysis methods nonflow effects extracted data. For ${v}_{2}$, scaling number constituent quarks...
Charged hadrons in [EQUATION: SEE TEXT] associated with particles of are reconstructed pp and Au+Au collisions at sqrt[sNN]=200 GeV. The multiplicity p magnitude sum found to increase from central collisions. distributions, while similar shape on the nearside, significantly softened awayside relative not much harder than that inclusive hadrons. results, consistent jet quenching, suggest fragments approach equilibration medium traversed.
We report the first measurement of charmed-hadron (D(0)) production via hadronic decay channel (D(0) → K(-) + π(+)) in Au+Au collisions at sqrt[s(NN)] = 200 GeV with STAR experiment. The charm cross section per nucleon-nucleon collision midrapidity scales number binary collisions, N(bin), from p+p to central collisions. D(0) meson yields Au are strongly suppressed compared those scaled by for transverse momenta p(T) > 3 GeV/c, demonstrating significant energy loss quarks hot and dense...
Ultra-relativistic Heavy-Ion Collision (HIC) generates very strong initial magnetic field ($\vec B$) inducing a vorticity in the reaction plane. The high $\vec{B}$ influences evolution dynamics that is opposed by large Faraday current due to electric generated time varying $\vec{B}$. We show resultant effects entail significantly directed flow ($v_1$) of charm quarks (CQs) compared light combination several favorable conditions for CQs, mainly: (i) unlike formation scale $\tau_f \simeq \,...
In a coalescence plus fragmentation approach we calculate the heavy baryon/meson ratio and $p_T$ spectra of charmed hadrons $D^{0}$, $D_{s}$ $\Lambda_{c}^{+}$ in wide range transverse momentum from low up to about 10 GeV discuss their ratios RHIC LHC energies without any change parameters. We have included contribution decays hadron resonances also one due quarks which do not undergo process. The process is tuned all charm hadronizing $p_T\rightarrow 0$ limit at finite undergoing are...
Transverse momentum spectra of pi+/-, p, and p up to 12 GeV/c at midrapidity in centrality selected Au + collisions square root sNN=200 GeV are presented. In central collisions, both pi +/- p(p) show significant suppression with respect binary scaling pT approximately >4 GeV/c. Protons antiprotons less suppressed than the range 1.5 < 6 The pi-/pi+ p/p ratios most a weak dependence no dependence. p/pi approach values d >5 results high indicate that partonic sources have similar energy loss...
Measurements of the production forward π0 mesons from p+p and d+Au collisions at √sNN=200 GeV are reported. The yield generally agrees with next-to-leading order perturbative QCD calculations. per binary collision is suppressed as η increases, decreasing to ∼30% ⟨η⟩=4.00, well below shadowing expectations. Exploratory measurements azimuthal correlations charged hadrons η≈0 show a recoil peak in that low pion energy. These observations qualitatively consistent saturation picture low-x gluon...
The heavy quarks constitutes a unique probe of the quark-gluon plasma properties. Both at RHIC and LHC energies puzzling relation between nuclear modification factor $R_{AA}(p_T)$ elliptic flow $v_2(p_T)$ has been observed which challenged all existing models, especially for D mesons. We discuss how temperature dependence quark drag coefficient is responsible large part such puzzle. In particular, we have considered four different models to evaluate diffusion coefficients propagating through...
We report on the first measurement of elliptic flow v2(pT) multistrange baryons Xi- +Xi+ and Omega- + Omega+ in heavy-ion collisions. In minimum-bias Au+Au collisions at square root s(NN)=200 GeV, a significant amount flow, comparable to other nonstrange baryons, is observed for which are expected be particularly sensitive dynamics partonic stage The pT dependence v2 confirms number constituent quark scaling previously lighter hadrons. These results support idea that substantial fraction...
Several transport models have been employed in recent years to analyze heavy-flavor meson spectra high-energy heavy-ion collisions. Heavy-quark coefficients extracted from these with their default parameters vary, however, by up a factor of 5 at high momenta. To investigate the origin this large theoretical uncertainty, systematic comparison heavy-quark is carried out between various models. Within common scheme devised for nuclear modification charm quarks brick medium quark-gluon plasma,...
We describe the propagation of charm quarks in quark-gluon plasma (QGP) by means a Boltzmann transport approach. Nonperturbative interaction between heavy and light have been taken into account through quasiparticle approach which partons are dressed with thermal masses tuned to lattice quantum chromodynamics (lQCD) thermodynamics. Such model is able main feature nonperturbative dynamics: enhancement strength near ${T}_{c}$. show that resulting in-medium evolution correctly predict...
The propagation of heavy quarks in the quark-gluon plasma was often treated within framework Langevin equation (LV), i.e., assuming momentum transfer is small or scatterings are sufficiently forward peaked, screening mass ${m}_{D}$. We address a direct comparison between dynamics and Boltzmann collisional integral (BM) when bulk medium equilibrium at fixed temperature. show that unless cross section quite peaked $({m}_{D}\ensuremath{\cong}T)$ to temperature ratio large...
Open and hidden heavy-flavor physics in high-energy nuclear collisions are entering a new exciting stage towards reaching clearer understanding of the experimental results with possibility to link them directly advancement lattice Quantum Chromo-Dynamics (QCD). Recent from experiments theoretical developments regarding open dynamics have been debated at Lorentz Workshop Tomography Quark-Gluon Plasma Heavy Quarks, which was held October 2016 Leiden, The Netherlands. In this contribution, we...
Groundwater vulnerability assessment could be defined as the degree of assimilation capacity area to contaminant from surrounding surface above aquifer. It has become an important element for sustainable natural resource management and proper landuse planning. This study aims at estimating shallow aquifer by applying GIS based DRASTIC model in Katri watershed, Dhanbad, Jharkhand. The probable groundwater quality decline due various anthropogenic activities within watershed necessitated this...
The spread of COVID19 through droplets ejected by infected individuals during sneezing and coughing has been considered a matter key concern. Therefore, quantitative understanding the propagation containing virus assumes immense importance. Here, we investigate evolution in space time under varying external conditions temperature, humidity, wind flow using laws statistical fluid mechanics. effects drag, diffusion, gravity on different sizes ejection velocities have their motion air. In still...
We study the dynamics of heavy quarks in a thermalized quark-gluon plasma with time-correlated thermal noise, $\ensuremath{\eta}$. In this case, it is said that $\ensuremath{\eta}$ has memory. use an integro-differential Langevin equation which memory enters via noise and dissipative force. assume time correlations decay exponentially on timescale, $\ensuremath{\tau}$, we treat as free parameter. compute effects $\ensuremath{\tau}\ensuremath{\ne}0$ thermalization quarks, their momentum...
The impact of momentum anisotropy the medium on heavy quarks (HQs) dynamics has been investigated in a hot QCD while considering both collisional and radiative processes within ambit Fokker-Planck approach. relative orientation HQs motion (momentum vector) with respect to direction is responsible for character transport coefficients. Therefore, drag diffusion coefficients are decomposed, respectively, into two four components by general tensor basis. decomposed (drag coefficients) (diffusion...
The drag and diffusion coefficients of charm bottom quarks propagating through quark gluon plasma (QGP) have been evaluated for conditions relevant to nuclear collisions at Large Hadron Collider (LHC). dead cone Landau-Pomeronchuk-Migdal (LPM) effects on radiative energy loss heavy considered. Both collisional processes are included in the {\it effective} coefficients. With these effective transport we solve Fokker Plank (FP) equation executing Brownian motion QGP. solution FP has used...
In the pre-thermal equilibrium stage of relativistic heavy-ion collisions, a strong quasi-classical transverse gluon field emerges at about τ0≃0.1fm/c and evolves together with their longitudinal counterparts according to classical Yang-Mills (CYM) equations. Recently it has been shown that these fields induce diffusion charm quarks in momentum space resulting tilt spectrum without significant drag. We find nucleus-nucleus collisions LHC such novel dynamics leads an initial enhancement...
Heavy quark $R_{AA}$ and $v_2$ have been calculated at RHIC energy considering initial conditions with without pre-equilibrium phase to highlight the effect of latter on heavy observables. The momentum evolution has studied by means Boltzmann transport equation. To model we used KLN condition. We found that impacts about 20-25 $\%$ whereas impact is very negligible. also in case initializations early thermalized quark-gluon plasma. checked particular form spectrum not important for $R_{AA}$,...
The drag and diffusion coefficients of heavy baryons ($\Lambda_c$ $\Lambda_b$) in the hadronic phase created latter stage heavy-ion collisions at RHIC LHC energies have been evaluated recently. In this work we compute some experimental observables, such as nuclear suppression factor $R_{AA}$ elliptic flow $v_2$ energies, highlighting role contribution to these which are going be measured Run 3 LHC. For time evolution quarks QGP use Langevin dynamics. hadronization employ Peterson...