A5006939293- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Black Holes and Theoretical Physics
- Superconducting Materials and Applications
- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Experimental and Theoretical Physics Studies
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Physics of Superconductivity and Magnetism
- Computational Physics and Python Applications
- Matrix Theory and Algorithms
- Quantum and electron transport phenomena
- Random Matrices and Applications
- Nuclear physics research studies
- Quantum and Classical Electrodynamics
- Stochastic processes and statistical mechanics
- Cosmology and Gravitation Theories
- Parallel Computing and Optimization Techniques
- Nonlinear Waves and Solitons
- Magnetic properties of thin films
- Advanced Data Storage Technologies
- Medical Imaging Techniques and Applications
- Distributed and Parallel Computing Systems
Pennsylvania State University
2015-2024
University of Illinois Urbana-Champaign
2024
Cyprus Institute
2023
University of Cyprus
2023
Berks County Public Libraries
2023
Istituto Nazionale di Fisica Nucleare, Sezione di Bologna
2022
Thomas Jefferson National Accelerator Facility
2009-2018
National Institute for Subatomic Physics
2017
Los Alamos National Laboratory
2016
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati
2003-2016
This report is based on a ten-week program Gluons and the quark sea at high-energies, which took place Institute for Nuclear Theory (INT) in Seattle Fall 2010. The principal aim of was to develop sharpen science case an Electron-Ion Collider (EIC), facility that will be able collide electrons positrons with polarized protons light heavy nuclei high energies, offering unprecedented possibilities in-depth studies quantum chromodynamics (QCD). organized around following four major themes: (i)...
In this paper we perform the first simultaneous QCD global analysis of data from semi-inclusive deep inelastic scattering, Drell-Yan, $e^+e^-$ annihilation into hadron pairs, and proton-proton collisions. Consequently, are able to extract a universal set non-perturbative functions that describes observed asymmetries in these reactions. The outcome our indicates single transverse-spin high-energy collisions have common origin. Furthermore, achieve phenomenological agreement with lattice on up...
We construct an improved implementation for combining transverse-momentum-dependent (TMD) factorization and collinear factorization. TMD is suitable low transverse momentum physics, while high momenta a cross section integrated over momentum. The result modified version of the standard $W+Y$ prescription traditionally used in Collins-Soper-Sterman (CSS) formalism related approaches. further argue that questions regarding shape $Q$ dependence sections at lower are largely governed by matching...
The feasibility of extracting generalized parton distributions (GPDs) from deeply virtual Compton scattering (DVCS) data has recently been questioned because the existence an infinite set so-called ``shadow GPDs'' (SGPDs). These SGPDs depend on process and manifest as multiple solutions (at a fixed scale ${Q}^{2}$) to inverse problem that needs be solved infer GPDs DVCS data. therefore pose significant challenge for With this motivation we study extent which QCD evolution can provide...
The naive time-reversal-odd (``$T$-odd'') parton distribution ${h}_{1}^{\ensuremath{\perp}}$, the so-called Boer-Mulders function, for both up ($u$) and down ($d$) quarks is considered in diquark spectator model. While results of different articles literature suggest that signs function semi-inclusive deep inelastic scattering (SIDIS) flavors $u$ $d$ are same negative, a previous calculation model found ${h}_{1}^{\ensuremath{\perp}(u)}$ ${h}_{1}^{\ensuremath{\perp}(d)}$ have signs. flavor...
We present an update to the QCD global analysis of single transverse-spin asymmetries presented in Cammarota, et al., PRD 102, 054002 (2020) (JAM3D-20). JAM3D-20 simultaneously included transverse momentum dependent and collinear twist-3 observables, both which are sensitive quark-gluon-quark correlations hadrons. In this study we extract for first time chiral odd fragmentation function $\tilde{H}$ by incorporating $\sin\phi_s$ modulation data from SIDIS along with its contribution asymmetry...
In the QCD evolution of transverse momentum dependent parton distribution and fragmentation functions, Collins-Soper kernel includes both a perturbative short-distance contribution large-distance nonperturbative, but strongly universal, contribution. past, global fits, based mainly on larger $Q$ Drell-Yan--like processes, have found substantial contributions from nonperturbative regions in kernel. this article, we investigate semi-inclusive deep inelastic scattering measurements region...
The T-odd distribution functions contributing to the transversity properties of nucleon and their role in fueling nontrivial contributions azimuthal asymmetries semi-inclusive deep inelastic scattering are investigated. We use a dynamical model evaluate these quantities terms HERMES kinematics.
We study the single transverse spin asymmetries in inclusive particle production within framework of generalized parton model (GPM). By carefully analyzing initial- and final-state interactions, we include process-dependence Sivers functions into GPM formalism. The modified formalism has a close connection with collinear twist-3 approach. Within new formalism, make predictions for $\pi^0$ direct photon productions at RHIC energies. find are opposite to those conventional
We analyze the spin asymmetry for single inclusive jet production in proton-proton collisions collected by AnDY experiment at Relativistic Heavy Ion Collider and Sivers data from semi-inclusive deep inelastic scattering experiments. In particular, we consider role color gauge invariance plays determining process dependence of effect. find that after carefully taking into account initial-state final-state interactions between active parton remnant polarized hadron, calculated based on...
Different kinematical regimes of semi-inclusive deeply inelastic scattering (SIDIS) processes correspond to different underlying partonic pictures, and it is important understand the transition between them. This particularly case when there sensitivity intrinsic transverse momentum, in which details can become especially important. We address question how identify current fragmentation region --- regime where a factorization picture with functions appropriate. distinguish this from soft...
We construct a language for identifying kinematical regions of transversely differential semi-inclusive deep inelastic scattering cross sections with particular underlying partonic pictures, especially in moderate to low $Q$ where sensitivity effects outside the usual very high energy limit becomes non-trivial. The pictures map power law expansions whose leading contributions ultimately lead well-known QCD factorization theorems. propose methods estimating consistency any region overall...
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...
We perform the first simultaneous extraction of parton collinear and transverse degrees freedom from low-energy fixed-target Drell-Yan data in order to compare momentum dependent (TMD) distribution functions (PDFs) pion proton. demonstrate that separation quark field encoded TMDs is more than $4\ensuremath{\sigma}$ smaller Additionally, we find decreases as its longitudinal fraction decreases. In studying nuclear modification TMDs, clear evidence for a EMC effect. comment on possible...
This handbook provides a comprehensive review of transverse-momentum-dependent parton distribution functions and fragmentation functions, commonly referred to as transverse momentum distributions (TMDs). TMDs describe the partons inside proton other hadrons with respect both their longitudinal momenta. They provide unique insight into internal spin structure hadrons, are key ingredient in description many collider physics cross sections. Understanding requires combination theoretical...
The nonvanishing of gluonic pole matrix elements can explain the appearance single spin asymmetries in high-energy scattering processes. We use a spectator framework approach to investigate spectral properties quark-quark-gluon correlators and this study elements. Such appear principle both for distribution functions such as Sivers function fragmentation Collins function. find that specific class models, contribution element vanishes. This outcome is important universality confirms findings...
The concept of weighted asymmetries is revisited for semi-inclusive deep inelastic scattering. We consider the cross section in Fourier space, conjugate to outgoing hadron's transverse momentum, where convolutions momentum dependent parton distribution functions and fragmentation become simple products. Individual asymmetric terms can be projected out by means a generalized set weights involving Bessel functions. Advantages employing these are that they suppress (divergent) contributions...
A set of quasi-parton distribution functions (quasi-PDFs) have been recently proposed by Ji. Defined as the matrix elements equal-time spatial correlations, they can be computed on lattice and should reduce to standard PDFs when proton momentum $P_z$ is very large. Since taking $P_z\to \infty$ limit not feasible in simulations, it essential provide guidance for what values quasi-PDFs are good approximations PDFs. Within framework spectator diquark model, we evaluate both up down quarks' all...
We present a new analysis of $A_N$ in $p^\uparrow p\to \pi\, X$ within the collinear twist-3 factorization formalism. incorporate recently derived Lorentz invariance relations into our calculation and focus on input from kinematical functions, which are weighted integrals transverse momentum dependent (TMD) functions. In particular, we use latest extractions Sivers Collins functions with TMD evolution to compute certain terms $A_N$. Consequently, able constrain remaining contributions lesser...
The factorization theorems of quantum chromodynamics (QCD) apply equally well to most simple field theories that require renormalization but where direct calculations are much more straightforward. Working with these simpler is convenient for stress-testing the limits program and examining general properties parton density functions (pdfs) or other correlation might be necessary a factorized description process. With this view in mind, we review steps real scalar Yukawa theory both deep...