arXiv subjects

Ritu Aggarwal

Publications and source records attributed to Ritu Aggarwal.

7 recordsLinked to original sources

arXiv2026

Study of quark and gluon jet identification in photoproduction at EIC

This paper presents a systematic study of the substructure of dijets produced in direct and resolved photoproduction events and subsequent quark and gluon jet identification in dijets, considering the kinematic reach of the upcoming Electron-Ion Collider (EIC) experiment. We investigate the substructure of jets produced in dijet photoproduction events with center-of-mass energies $\sqrt{s} = 64 \text{--}140$ GeV at the EIC.~Events are simulated using event generator PYTHIA and contributions from direct and resolved photoproduction subprocesses are analyzed at different energies.~Jets are reconstructed using longitudinally invariant $k_T$ algorithm within the FastJet framework.~Substructure of quark and gluon initiated jets in the selected dijet photoproduction sample is studied in detail by using jet-shape variables.~Predictions for subjet multiplicities and integrated jet shapes are presented in the gluon-initiated and quark-initiated jets in the dijet photoproduction events at the EIC energies.~These results demonstrate the feasibility of distinguishing quark and gluon jets in the photoproduction events at the EIC and provide a baseline for further QCD studies.

hep-ex↗

arXiv2025

Event shapes and Inclusive Hadron Spectra at FCC-ee energies

We analyze hadronic final states of $e^+e^-$ annihilation through event shape observables, Thrust and C-parameter, and inclusive hadron spectra at the planned center-of-mass (c.m.) energies of the Future Circular Electron-Positron Collider (FCC-ee). Collision data is produced using Monte Carlo event generation in PYTHIA at 91.2, 160, 240, and 365 GeV. Distortions of event shapes due to initial-state photon radiation and background decays of Z pairs, W pairs, top-quark pairs, and Higgs bosons are investigated. An extraction of the strong coupling $\alpha_{\text{s}}$ is performed by fitting event shape distributions to perturbative QCD predictions at next-to-next-to-leading-order (NNLO) accuracy, and the sources of systematic uncertainties at high c.m. energies are discussed. Soft gluon dynamics is examined through charged particle multiplicities and momentum distributions, and energy evolution of mean values is compared with prior experimental results. The inferences from this phenomenological study provide a reference to QCD studies at future high-energy $e^+e^-$ colliders.

hep-ph↗

arXiv2024

PartonDensity.jl: a novel parton density determination code

We introduce our novel Bayesian parton density determination code, PartonDensity.jl. The motivation for this new code, the framework and its validation are described. As we show, PartonDensity.jl provides both a flexible environment for the determination of parton densities and a wealth of information concerning the knowledge update provided by the analyzed data set.

hep-ph↗

arXiv2022

New constraints on the up-quark valence distribution in the proton

The high-$x$ data from the ZEUS Collaboration are used to extract parton density distributions of the proton deep in the perturbative regime of QCD. The data primarily constrain the up-quark valence distribution and new results are presented on its $x$-dependence as well as on the momentum carried by the up-quark. The results were obtained using Bayesian analysis methods which can serve as a model for future parton density extractions.

hep-ph↗

arXiv2022

Kinematic fitting of Neutral current events in deep inelastic ep collisions

In this paper we present a technique to reconstruct the scaling variables defining $ep$ deep inelastic scattering by performing a kinematic fit. This reconstruction technique makes use of the full potential of the data collected. It is based on Bayes Theorem and involves the use of informative priors. The kinematic fit method has been tested for the neutral current ep simulated sample at a center of mass energy of 318 GeV with $Q^2$ > 400 GeV$^2$. In addition to the scaling variables, this method is able to estimate the energy of possible initial state radiation (E$_γ$ ) which otherwise goes undetected. A better resolution than standard electron and double angle techniques in the reconstruction of scaling variables is achieved using a kinematic fit.

hep-ex↗

arXiv2021

Study of proton parton distribution functions at high x

At large values of $x$ the parton distribution functions (PDFs) of the proton are poorly constrained and there are considerable variations between different global fits. Data at such high $x$ have already been published by the ZEUS Collaboration, but not yet used in PDF extractions. A technique for comparing predictions based on different PDF sets to the observed number of events in the ZEUS data is presented. It is applied to compare predictions from the most commonly used PDFs to published ZEUS data at high Bjorken $x$. A wide variation is found in the ability of the PDFs to predict the observed results. A scheme for including the ZEUS high $x$ data in future PDF extractions is discussed.

hep-ex↗

arXiv2012

Error Bars for Distributions of Numbers of Events

The common practice for displaying error bars on distributions of numbers of events is confusing and can lead to incorrect conclusions. A proposal is made for a different style of presentation that more directly indicates the level of agreement between expectations and observations.

physics.data-an↗