A5091157890- High-Energy Particle Collisions Research
- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Black Holes and Theoretical Physics
- Pulsars and Gravitational Waves Research
- Phase Equilibria and Thermodynamics
- Theoretical and Computational Physics
- Numerical methods in inverse problems
- Particle accelerators and beam dynamics
- Nuclear physics research studies
- Particle Accelerators and Free-Electron Lasers
- Quantum and Classical Electrodynamics
- Distributed and Parallel Computing Systems
- Superconducting Materials and Applications
- Cosmology and Gravitation Theories
Aligarh Muslim University
2016-2025
Wayne State University
2014-2016
Saha Institute of Nuclear Physics
2009-2014
We obtain the radiative energy loss of a heavy quark in deconfined medium due to radiation gluons off them using recently derived generalised gluon emission spectrum. find that flavour loses almost similar fashion like light quarks through this process. With this, we further analyse nuclear modification factor for D-meson at LHC and RHIC energies. In particular, obtained result is found be close agreement with most recent data from ALICE collaboration 2.76 ATeV Pb–Pb collisions. also discuss...
An improved generalized suppression factor for gluon emission off a heavy quark is derived within perturbative QCD, which valid the full range of rapidity radiated and also has no restriction on scaled mass with its energy. In appropriate limit, it correctly reproduces usual dead cone in forward region. On other hand, this becomes close to unity backward direction. This indicates small region, should have an impact phenomenology energy loss hot dense matter produced ultrarelativistic ion collisions.
We outline the physics opportunities provided by Electron Ion Collider (EIC). These include study of parton structure nucleon and nuclei, onset gluon saturation, production jets heavy flavor, hadron spectroscopy tests fundamental symmetries. review present status future challenges in EIC theory that have to be addressed order realize this ambitious impactful program, including how engage a diverse inclusive workforce. In address these many-fold challenges, we propose coordinated effort...
In this article, there are 18 sections discussing various current topics in the field of relativistic heavy-ion collisions and related phenomena, which will serve as a snapshot state art. Section 1 reviews experimental results some recent light-flavored particle production data from ALICE collaboration. Other mostly theoretical nature. Very strong but transient magnetic created could have important observational consequences. This has generated lot activity last decade. Sections 2, 7, 9, 10...
Until recently the spin-flip processes in deep inelastic scatterings are thought to be suppressed high energy. We found a positive intercept for generalized transverse momentum-dependent parton distribution (GTMDs) <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>Re</a:mi><a:mo stretchy="false">(</a:mo><a:msub><a:mi>F</a:mi><a:mrow><a:mn>1</a:mn><a:mo>,</a:mo><a:mn>2</a:mn></a:mrow></a:msub><a:mo stretchy="false">)</a:mo></a:math> as <e:math...
We have shown that the small-<a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>x</a:mi></a:math> evolution of leading-log dipole scattering amplitudes, both pomeron and odderon, in momentum space can be completely determined by respective with rescaled momenta. In position space, if there is translation symmetry (assumption a large nucleus), cross section depends on positions quarks antiquarks only through their separation. The present study an equivalent...
The case of gluon bremsstrahlung off a heavy quark in extended nuclear matter is revisited within the higher twist formalism. In particular, in-medium modification "semi-hard" quarks studied, where momentum larger but comparable to mass ($p \gtrsim M$). contrast all prior calculations, emission spectrum entirely controlled by transverse diffusion parameter ($\hat q$), both for light and quarks, this work, we demonstrate that (unlike flavors) also sensitive $\hat e$, which so far has been...
We generalize the most extensively used Gunion-Bertsch formula for soft gluon emission in a perturbative QCD. show that corrections arising due to this generalization could be very important phenomenology of hot and dense matter produced heavy-ion collisions.
Based on quantum statistical mechanics we show that the $SU(3)$ color singlet ensemble of a quark-gluon gas exhibits $Z(3)$ symmetry through normaized character in fundamental representation and also becomes equivalent, within stationary point approximation, to given by Polyakov Loop. Also Loop gauge potential is obtained considering spatial gluons along with invariant Haar measure at each space point. The probability normalized vis-a-vis found be maximum particular value exhibiting strong...
The case of heavy quark propagation in dense extended matter is studied the multiple scattering formalism higher twist energy loss scheme. We consider deep inelastic off a large nucleus. hard lepton scatters fluctuation within one nucleons. This then propagates through medium, multiply gluon field remaining nucleons its path. fictitious process where nucleus without radiation. Invoking soft-collinear effective theory power counting arguments, we ``semihard'' mass order outgoing momentum and...
In this work, we first introduced a generalized Wilson line gauge link that reproduces both staple and near straight links along light cone in different parameter limits. We then studied the gauge-invariant bilocal orbital angular momentum operator with such general link. At appropriate combination of limits, Jaffe-Manohar's Ji's structures offers continuous analytical interpolation between two.
Concept of transverse deflection probability a parton that travels through strongly interacting medium, recently introduced by D'Eramo, Liu and Rajagopal, have been used to derive high energy evolution equation for the jet quenching parameter in stochastic multiple scatterings regime. Jet parameter, ${\hat q}(x)$, appears evolve with $x$, an exponent $0.9{\bar \alpha}_s$, which is slightly less than $x {\cal G} (x)$ where ${\cal gluon distribution function.
We derive analytical results for unintegrated color dipole gluon distribution function at small transverse momentum. By Fourier transforming the $S$-matrix large dipoles we in form of a series Bells polynomials. Interestingly, when resumming leading log accuracy, showing up striking similarity with Sudakov factor role play coupling is being done by constant that stems from saddle point condition along saturation line.
Most of the models jet quenching generally assumes that a always travels in straight eikonal path, which is indeed true for sufficiently hard but may not be good one moderate and low momentum jet. In this article an attempt has been made to relax part approximation $2\ensuremath{\rightarrow}3$ processes found (15--20)% suppression differential cross section moderately jets because noneikonal effects. particular, process $q{q}^{\ensuremath{'}}\ensuremath{\rightarrow}q{q}^{\ensuremath{'}}g$...
SU$({N}_{c})$ color-singlet restriction, along with flavor and spin symmetry, on a thermal partonic ensemble is shown to recombine the partons internal color structure into multiquark clusters, which can be identified various hadronic modes at given temperature. This provide possible basis for recombination model hadronization of quark-gluon plasma. also leads natural explanation ratio (anti)protons pions quark number scaling elliptic flow coefficient in relativistic heavy-ion collisions.
We revisited the solution of a linearized form leading-order Balitsky-Kovchegov equation (linear in $S$-matrix for dipole-nucleus scattering). Here we adopted dipole transverse-width-dependent cutoff order to regulate integral. also have taken care all higher-order terms (higher cutoff) that been reasonably neglected before. The reproduces both McLerran-Venugopalan-type initial condition (Gaussian scaling variable) and Levin-Tuchin logarithm appropriate limits. It connects these two opposite...
We calculate the soft gluon radiation spectrum off heavy quarks (HQs) interacting with light (LQs) beyond small angle scattering (eikonality) approximation and thus generalize dead-cone formula of extensively used in literatures Quark-Gluon Plasma (QGP) phenomenology to large regime which may be important energy loss energetic deconfined medium. In proper limits, we reproduce all relevant existing formulae for distribution quarks, or light, QGP phenomenology.
We have shown that the small-$x$ evolution of off-forward leading-log dipole scattering amplitudes, both pomeron and odderon, in momentum space can be completely determined by respective forward with rescaled momenta. In position space, if there is translation symmetry (assumption a large nucleus), cross section depends on positions quarks anti-quarks only through their separation. The present study an equivalent proposition -- where bifurcates amplitudes into two translationally symmetric...
The Jalilian-Marian-Iancu-McLerran-Weigert-Leonidov-Kovner equation tells how gauge invariant higher order Wilson line correlators would evolve at high energy. In this article, we have revisited the and presented a convenient integrodifferential form of that is carrying identical-looking generalized kernels for all explicit real virtual terms. equation, ``real'' terms correspond to splitting (say position $z$) $2n$-tuple correlator various pairs $2m$-tuple $(2n+2\ensuremath{-}2m)$-tuple...
The nonperturbative uncertainties from the infrared renormalons in (color dipole) gluon distribution is estimated. It shown that non-linear saturation effects at small-x shift first IR pole Borel plane 2/β2 to 1/β2. As a consequence estimated uncertainty found be O(ΛQCD2) instead of O(ΛQCD4). however accompanied by soft suppression term which results further renormalon contribution small x.
In this work, we first introduced a generalized Wilson line gauge link that reproduces both staple and near straight links along the light cone in different parameter limits. We then studied gauge-invariant bi-local orbital angular momentum operator with such general link, framework of Chen et. al. decomposition fields. At appropriate combination limits, Jaffe-Manohar Ji's structure offers continuous analytical interpolation between two.
Heavy quarks produced in the initial stage of heavy ion collisions would traverse quark gluon plasma, colliding with and gluons radiating gluons.In process collision also by radiation they lose energy.After their production, may get fragmented into mesons picking up light quarks/antiquarks turn decay through leptonic channels.These leptons carry information evolution plasma.In this work, we have made a detailed study for nuclear modification factor production muons from fusion partons at LHC...