C. Sirimanna
A5036761617- High-Energy Particle Collisions Research
- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Laser-Plasma Interactions and Diagnostics
- Particle Dynamics in Fluid Flows
- Gamma-ray bursts and supernovae
- Magnetic confinement fusion research
- Quantum, superfluid, helium dynamics
- Cold Fusion and Nuclear Reactions
- Granular flow and fluidized beds
- Plasma and Flow Control in Aerodynamics
- Aerodynamics and Acoustics in Jet Flows
- Meteorological Phenomena and Simulations
- demographic modeling and climate adaptation
- Fluid Dynamics and Turbulent Flows
- Markov Chains and Monte Carlo Methods
- Atomic and Subatomic Physics Research
Duke University
2024-2025
Wayne State University
2017-2025
Seascape Consultants (United Kingdom)
2022-2023
Akita International University
2022
We study the properties of strongly-coupled quark-gluon plasma with a multistage model heavy ion collisions that combines T$_\mathrm{R}$ENTo initial condition ansatz, free-streaming, viscous relativistic hydrodynamics, and hadronic transport. A model-to-data comparison Bayesian inference is performed, revisiting assumptions made in previous studies. The role parameter priors studied light their importance towards interpretation results. emphasize use closure tests to perform extensive...
Using combined data from the Relativistic Heavy Ion and Large Hadron Colliders, we constrain shear bulk viscosities of quark-gluon plasma (QGP) at temperatures ∼150–350 MeV. We use Bayesian inference to translate experimental theoretical uncertainties into probabilistic constraints for viscosities. With model averaging propagate an estimate uncertainty generated by transition hydrodynamics hadron transport in plasma's final evolution stage, providing most reliable phenomenological date on...
We report a new determination of $\stackrel{\ifmmode \hat{}\else \^{}\fi{}}{q}$, the jet transport coefficient quark-gluon plasma. use JETSCAPE framework, which incorporates novel multistage theoretical approach to in-medium evolution and Bayesian inference for parameter extraction. The calculations, based on Matter Lbt quenching models, are compared experimental measurements inclusive hadron suppression in $\mathrm{Au}+\mathrm{Au}$ collisions at BNL Relativistic Heavy Ion Collider (RHIC)...
We present a new study of jet interactions in the quark-gluon plasma created high-energy heavy-ion collisions, using multistage event generator within jetscape framework. focus on medium-induced modifications rate inclusive jets and high transverse momentum (high-${p}_{\mathrm{T}}$) hadrons. Scattering-induced energy loss is calculated two stages: virtuality stage based matter model, which scattering highly virtual partons modifies vacuum radiation pattern, second at lower lbt leading gain...
The modification of hard jets in an extended static medium held at a fixed temperature is studied using three different Monte Carlo event generators: linear Boltzmann transport (LBT), modular all twist transverse-scattering elastic-drag and radiation (MATTER), algorithm for relativistic treatment heavy-ion interactions (MARTINI). Each generator contains set assumptions regarding the energy virtuality partons within jet versus scale and, hence, applies to epoch space-time history evolution....
We study parton energy-momentum exchange with the quark gluon plasma (QGP) within a multistage approach composed of in-medium Dokshitzer-Gribov-Lipatov-Altarelli-Parisi evolution at high virtuality, and (linearized) Boltzmann transport formalism lower virtuality. This simulation is then calibrated in comparison high-<a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:msub><a:mi>p</a:mi><a:mi>T</a:mi></a:msub></a:math> charged hadrons, <b:math...
The JETSCAPE simulation framework is an overarching computational envelope for developing complete event generators heavy-ion collisions. It allows modular incorporation of a wide variety existing and future software that simulates different aspects collision. default package contains both the framework, entire set indigenous third party routines can be used to directly compare with experimental data. In this article, we outline algorithmic design define interfaces describe modules required...
The JETSCAPE framework is a modular and versatile Monte Carlo software package for the simulation of high energy nuclear collisions. In this work we present new tune JETSCAPE, called PP19, validate it by comparison to jet-based measurements in $p+p$ collisions, including inclusive single jet cross sections, shape observables, fragmentation functions, charged hadron dijet mass sections. These observables collisions provide baseline their counterparts Quantifying level agreement results with...
We present a study of the transverse size parton showers and their diminishing interaction with medium in high virtuality stage jet evolution. consider process hard quark produced deep inelastic scattering off large nucleus. Single gluon radiation from this quark, absence scattering, is re-derived using wave-packets. This allows for derivation quantum uncertainty at point splitting. then incorporated within Monte-Carlo shower routine yielding sizes noticeably larger than classical antenna...
QCD jets are considered important probes for quark gluon plasma created in collisions of nuclei at high energies. Their parton showers significantly altered if they develop inside a deconfined medium. Hadronization is also thought to be affected by the presence quarks and gluons. We present systematic study effects thermal bath partons on hadronization showers. use JETSCAPE framework create both vacuum brick plasma. The setup allows parameters, like size as well collective flow partons,...
The Collaboration reports a new determination of the jet transport parameter <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mover accent="true"><a:mi>q</a:mi><a:mo>̂</a:mo></a:mover></a:math> in quark-gluon plasma (QGP) using Bayesian inference, incorporating all available inclusive hadron and yield suppression data measured heavy-ion collisions at BNL Relativistic Heavy Ion Collider (RHIC) CERN Large Hadron (LHC). This multi-observable analysis extends previously published...
Understanding the modification of jets and high-$p_T$ probes in small systems requires integration soft hard physics. We present recent developments extending JETSCAPE framework to build an event generator, which includes correlations between partons, study jet observables systems. The multi-scale physics collision is separated into different stages. Hard scatterings are first sampled at binary positions provided by Glauber geometry. They then propagated backward space-time following...
We present predictions and postdictions for a wide variety of hard jet-substructure observables using multistage model within the framework. The details various parameter choices are described in []. A novel feature this is presence two stages jet modification: high-virtuality phase [modeled modular all twist transverse-scattering elastic-drag radiation ()], where modified coherence effects diminish medium-induced radiation, lower virtuality linear Boltzmann transport parton splits fully...
Parton energy-momentum exchange with the quark gluon plasma (QGP) is a multi-scale problem. In this work, we calculate interaction of charm quarks QGP within higher twist formalism at high virtuality and energy using MATTER model, while low portion treated via (linearized) Boltzmann Transport (LBT) formalism. Coherence effect that reduces medium-induced emission rate in model also taken into account. The interplay between these two formalisms studied detail used to produce good description...
The widespread notion that jets quenched in a quark-gluon-plasma (QGP) are similar their parton flavor composition to vacuum is critically examined. We demonstrate while the soft semihard (low intermediate transverse momentum ${p}_{T}$) sector of predominantly bosonic i.e., composed gluons, sufficiently can have an fermionic, dominated by quarks and antiquarks. demonstrate, using leading-order perturbative QCD processes, rate conversion from gluon traversing QGP as part jet, quark or...
A detailed reanalysis of the single gluon emission rate at next-to-leading twist is carried out. As was case in prior efforts, problem cast framework deep-inelastic scattering (DIS) an electron off a large nucleus. The quark produced interaction propagates through remaining nucleus and engenders radiation, which calculated limit one rescattering. This medium induced forms basis several energy loss calculations both DIS heavy-ion collisions. Unlike complete transverse momentum gradient...
We use a Bayesian-calibrated multistage viscous hydrodynamic model to explore deuteron yield, mean transverse momentum and flow observables in LHC Pb-Pb collisions. theoretical uncertainty the production of deuterons, including (i) contribution thermal (ii) models for subsequent formation deuterons (hadronic transport vs coalescence) (iii) overall sensitivity results -- particular bulk viscosity, which is often neglected studies production. Using physical parameters set by comparison only...
In this talk we review jet production in a large variety of collision systems using the JETSCAPE event generator and Hybrid Hadronization. Hadronization combines quark recombination, applicable when distances between partons phase space are small, string fragmentation appropriate for dilute parton systems. It can therefore smoothly describe transition from very like $e^++𝑒^−$ to full $𝐴 + 𝐴$ collisions. We test picture by generate jets various Comparison experimental data $𝑝 𝑝$ collisions...
The modification of jet substructure in relativistic heavy-ion collisions is studied using JETSCAPE, a publicly available software package containing framework for Monte Carlo event generators. Multi-stage evolution JETSCAPE provides an integrated description quenching by combining multiple models, with each becoming active at different stage the parton shower evolution. Jet due to aspects shape and fragmentation observables. Various combinations energy loss models are exploed, medium...
Considerable information about the early-stage dynamics of heavy-ion collisions is encoded in rapidity dependence measurements. To leverage large amount experimental data, we perform a systematic analysis using three-dimensional hydrodynamic simulations multiple collision systems -- and small, symmetric asymmetric. Specifically, fully 3D multi-stage initialized by parameterized model for rapidity-dependent energy deposition, which calibrate on hadron multiplicity anisotropic flow...
The JETSCAPE Collaboration reports the first multi-messenger study of QGP jet transport parameter $\hat{q}$ using Bayesian inference, incorporating all available hadron and inclusive yield substructure data from RHIC LHC. theoretical model utilizes virtuality-dependent in-medium partonic energy loss coupled to a detailed dynamical evolution. Tension is observed when constraining for different kinematic cuts data. addition shown improve constraint on $\hat{q}$, without inducing tension with...
Prompt photons are created in the early stages of heavy ion collisions and traverse QGP medium without any interaction. Therefore, photon-triggered jets can be used to study jet quenching medium. In this work, studied through different substructure observables for collision systems energies using JETSCAPE framework. Since multistage evolution framework is adequate describe a wide range experimental simultaneously same parameter tune, we use parameters tuned leading hadron studies. The...
We utilize event-by-event Monte Carlo simulations within the JETSCAPE framework to examine scale-dependent jet-medium interactions in heavy-ion collisions. The reduction interaction during early high-virtuality stage, where medium is resolved at a short distance scale, emphasized as key element explaining multiple jet observables, particularly substructures, simultaneously. By employing MATTER+LBT setup, which incorporates this explicit of effects high virtuality, we investigate substructure...
Shower development dynamics for a jet traveling through the quark-gluon plasma (QGP) is multiscale process, where heavy flavor mass an important scale. During high virtuality portion of evolution in QGP, emission gluons from modified owing to quark mass. Medium-induced radiation sensitive microscopic processes (e.g. diffusion), whose dependence phenomenologically explored this study. In lower part shower evolution, i.e. when comparable parton, scattering and quarks differ light quarks. The...