A5042301490- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Particle Accelerators and Free-Electron Lasers
- Dark Matter and Cosmic Phenomena
- Superconducting Materials and Applications
- Cosmology and Gravitation Theories
- Research Data Management Practices
- Distributed and Parallel Computing Systems
- Radiopharmaceutical Chemistry and Applications
- Terahertz technology and applications
- Black Holes and Theoretical Physics
- Geophysical and Geoelectrical Methods
- Photorefractive and Nonlinear Optics
- Numerical methods in inverse problems
- Quantum chaos and dynamical systems
- Particle accelerators and beam dynamics
- Medical Imaging Techniques and Applications
- Microwave Imaging and Scattering Analysis
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Data Storage Technologies
- Electromagnetic Scattering and Analysis
- Quantum, superfluid, helium dynamics
Indian Institute of Technology Delhi
2008-2024
Institut des Sciences des Plantes de Paris Saclay
2018
Old Dominion University
2018
Stony Brook University
2018
Morehouse College
2018
Shiv Nadar University
2016-2018
Central China Normal University
2018
Thomas Jefferson National Accelerator Facility
2018
Brookhaven National Laboratory
2011-2016
Universität Hamburg
2009-2010
This White Paper presents the science case of an Electron-Ion Collider (EIC), focused on structure and interactions gluon-dominated matter, with intent to articulate it broader nuclear community. It was commissioned by managements Brookhaven National Laboratory (BNL) Thomas Jefferson Accelerator Facility (JLab) objective presenting a summary scientific opportunities goals EIC as follow-up 2007 NSAC Long Range plan. document is culmination community-wide effort in following series workshops...
This White Paper presents the science case of an Electron-Ion Collider (EIC), focused on structure and interactions gluon-dominated matter, with intent to articulate it broader nuclear community. It was commissioned by managements Brookhaven National Laboratory (BNL) Thomas Jefferson Accelerator Facility (JLab) objective presenting a summary scientific opportunities goals EIC as follow-up 2007 NSAC Long Range plan. document is culmination community-wide effort in following series workshops...
We present a new technique to calculate the cross-section for diffractive vector meson production and DVCS in electron-ion collisions based on dipole model. The measurement of these processes can provide valuable information non-linear QCD phenomena, such as gluon saturation, is only known way gain insight into spatial distribution gluons nuclei. predictions differential $d\sigma/dQ^2$ $d\sigma/dt$ $J/\psi$ $\phi$ heavy nuclei demonstrate feasibility extracting source nuclei, F(b), from...
This document presents BNL's plan for an electron-ion collider, eRHIC, a major new research tool that builds on the existing RHIC facility to advance long-term vision Nuclear Physics discover and understand emergent phenomena of Quantum Chromodynamics (QCD), fundamental theory strong interaction binds atomic nucleus. We describe scientific requirements such facility, following up community-wide 2012 white paper, 'Electron-Ion Collider: Next QCD Frontier', present design concept incorporates...
We investigate saturation effects in ep scattering as well ultraperipheral pA and AA collisions at small x with four variants of the impact parameter dependent color dipole model: without gluon a novel mechanism that suppresses unphysical radii above confinement scale, problem not addressed by most implementations. show HERA can be very described any variants. When going from to eA scattering, are expected increase ∼A1/3. In lieu an electron-ion collider, we confront different versions model...
Impact parameter dependent dipole models are ideal tools for investigating the spatial structure of proton. We investigate incoherent $ep$ cross section in exclusive $J/\psi$ photoproduction as measured by HERA, and find that $|t|$ increases, need several levels substructure gluon density fluctuations order to describe data well. In lieu a perturbative description, we add this hand. This is modelled hotspots within hotspots. enables us measurements $|t|> 1$~GeV$^2$, which necessary...
The gluon radius of the proton is expected to increase at small momentum fractions $x$, an effect which has hitherto not been considered in dipole model framework. We investigate energy dependence exclusive $J/\ensuremath{\psi}$, $\ensuremath{\phi}$, and $\ensuremath{\rho}$ production by introducing three models for $x$ thickness function. allow transverse width as decreases, using novel parametrizations spherical hotspot model. compare these with a where number hotspots increases decreases...
We apply the MC@NLO formalism to production of heavy-quark pairs in pointlike photon-hadron collisions. By combining this result with its analogue relevant hadron-hadron collisions, we obtain NLO predictions matched parton showers for photoproduction QQ^{-} pairs. compare results measurements c- and b-flavoured hadron observables performed by H1 ZEUS collaborations at HERA.
Sartre~has been extensively used for describing photon-nuclei processes at the electron-ion collider (EIC) as well ultra-peripheral collisions (UPC) LHC and RHIC. Sartre is an event generator which implements dipole model DIS, models transverse geometry of target nucleus or proton in coordinate space. It uses Good-Walker mechanism simulating fluctuations contribute to incoherent cross section breaks up after interaction. With improved precision UPC measurements last years, a detailed test...
We investigate events with very forward neutrons in $ep$ collisions at HERA using impact parameter dependent color dipole models and without saturation. This is the first study of leading neutron process deploying these models. The model predictions are compared available measurements for $6<{Q}^{2}<100\text{ }\text{ }{\mathrm{GeV}}^{2}$, $70<W<245\text{ }\mathrm{GeV}$. Our analysis shows that exhibit Feynman scaling, independent ${Q}^{2}$. results demonstrate $W$ ${Q}^{2}$ dependence cross...
The hotspot model has proven to be an efficient tool study coherent and incoherent diffraction HERA data by modelling the initial state of proton. in its original form is a non-perturbative applicable for low momentum transfer underestimates cross section orders magnitude when extended large studies J/ψ photo-production at HERA. We present here splittings based on resolution evolution probes gluon wave function smaller length scales as we increase which appears our model. In addition...
We present a model of proton geometry where the number and size gluon density hotspots in proton's thickness function evolves with resolution scale event, given by Mandelstam $t$ variable exclusive diffractive $ep$ collisions. use impact-parameter dependent saturation dipole bSat (IPsat), as well its linearised (non-saturated) version bNonSat. In latter has clear interpretation former it is directly related to scale. The resulting phenomenological for splitting hotspots, making full earlier...
We present a model of proton geometry where the number and size gluon density hotspots in proton's thickness function evolves with resolution scale event given by Mandelstam $t$ variable exclusive diffractive $ep$ collisions. use impact-parameter dependent saturation dipole bSat/IPSat, as well its linearised (non-saturated) version bNonSat. In latter has clear interpretation former it is directly related to scale. The resulting phenomenological for splitting hotspots, making full earlier...
Geometry tagging is an experimental technique for selecting event samples where one can, on a statistical basis, control the geometry of collision in order to make more incisive physics measurements. Several measurements at EIC would benefit significantly from use this technique, including studies gluon anti-shadowing, parton propagation, attenuation and hadronization nucleus, ultimately search saturation. The JLEIC full-acceptance detector, with full acceptance forward-going neutrons,...
The event generator Sartre has been used extensively for simulations of electron-ion collisionsin preparation the Electron-Ion Collider (EIC). simulates exclusive diffraction in eAcollisions, principle any nuclear species and final state, usually a vector meson.The coherent incoherent cross sections each process are calculated colour dipolemodel small x from first second moments respective amplitude, averaged overinitial state spatial configurations. Taking these averages is very CPU...
With the imminent construction of an electron-ion collider in USA, both saturation physics and nuclear shadowing will be important for same processes first time. In particular exclusive production vector mesons, such as J/$\psi$. this paper we investigate underlying assumptions commonly made when phenomenologically investigating process from a perspective respectively. We use bSat model which is used to describe physics, calculation by M.G. Ryskin describing at leading twist. It expected...
We show within the saturation framework that measurements of exclusive vector meson production at high energy provide evidence for strong geometric fluctuations proton.In comparison, effect scale and color charge is weak.This knowledge will allow detailed future incoherent cross section to tightly constrain fluctuating geometry proton as a function parton momentum fraction x.
The event generator Sar$t$re has been used extensively for simulations of electron-ion collisions in preparation the Electron-Ion Collider (EIC). simulates exclusive diffraction $e$A collisions, principle any nuclear species and final state, usually a vector meson. coherent incoherent cross sections each process are calculated colour dipole model small $x$ from first second moments respective amplitude, averaged over initial state spatial configurations. Taking these averages is very CPU...
In these proceedings I describe how a future electron-ion collider will allow us to directly measure the initial spatial distribution of gluons in heavy ions, as well its variance ("lumpiness") exclusive diffraction. show feasibility such measurement by means simulated data from novel event generator Sartre.