A5071506792- 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
- Arctic and Russian Policy Studies
- Fullerene Chemistry and Applications
- Pulsars and Gravitational Waves Research
- Indigenous Studies and Ecology
- Cosmology and Gravitation Theories
- Quantum, superfluid, helium dynamics
- Solid State Laser Technologies
- Noncommutative and Quantum Gravity Theories
- Water Governance and Infrastructure
- Atomic and Subatomic Physics Research
- Particle accelerators and beam dynamics
- Advanced NMR Techniques and Applications
- Advanced Fiber Laser Technologies
- South Asian Studies and Conflicts
- Advanced Chemical Physics Studies
- Molecular Junctions and Nanostructures
- Diamond and Carbon-based Materials Research
- Relativity and Gravitational Theory
- Gamma-ray bursts and supernovae
University of Connecticut
2015-2024
University of Vienna
2024
Stony Brook University
2023
Thomas Jefferson National Accelerator Facility
2016-2023
Istituto Nazionale di Fisica Nucleare, Sezione di Bologna
2022
University of Tübingen
2016-2019
Ruhr University Bochum
2001-2019
Petersburg Nuclear Physics Institute
2017-2019
Kurchatov Institute
2019
Irkutsk State University
2017
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...
The physics related to the form factors of energy momentum tensor spans a wide spectrum problems, and includes gravitational physics, hard exclusive reactions, hadronic decays heavy quarkonia, exotic hadrons described as hadroquarkonia. It also provides access "last global unknown property:" D-term. We review associated with energy-momentum D-term, their interpretations in terms mechanical properties, applications, current experimental status.
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...
Leading and subleading-twist transverse momentum dependent parton distribution functions (TMDs) are studied in a quark-model framework provided by the bag model. A complete set of relations among different TMDs is derived, question discussed how model (in)dependent such are. connection pretzelosity quark orbital angular derived. Numerical results presented, applications for phenomenology discussed. In particular, it shown that valence-$x$ region supports Gaussian Ansatz dependence TMDs.
The gravitational form factors encode fundamental particle properties including mass, spin, and $D$-term. Their physical interpretation promises, for composed particles, insights on spatial distributions of energy, angular momentum, internal forces. This Colloquium reviews the theoretical recent experimental advances in this field with focus quark-gluon structure proton QCD.
The nucleon form factors of the energy-momentum tensor are studied in large-Nc limit framework chiral quark-soliton model.2 MoreReceived 27 February 2007DOI:https://doi.org/10.1103/PhysRevD.75.094021©2007 American Physical Society
The Sivers function is extracted from HERMES data on single spin asymmetries in semi-inclusive deeply inelastic scattering. Our analysis use a simple Gaussian model for the distribution of transverse parton momenta, together with flavor dependence given by leading $1/{N}_{c}$ approximation and neglect antiquark distribution. We find that within errors these approximations are sufficient.
It is shown that intrinsic transverse parton momenta ${p}_{T}$ in semi-inclusive deep-inelastic scattering (SIDIS) and the Drell-Yan process (DY) are very well consistently described Gauss model with energy-dependent Gaussian widths. Our work solidifies basis for future studies of ${p}_{T}$-effects. We also discuss Cahn Boer-Mulders effect SIDIS DY.
At leading twist the transverse momentum dependent parton distributions of pion consist two functions, unpolarized ${f}_{1,\ensuremath{\pi}}(x,{\mathbit{k}}_{\ensuremath{\perp}}^{2})$ and Boer-Mulders function ${h}_{1,\ensuremath{\pi}}^{\ensuremath{\perp}}(x,{\mathbit{k}}_{\ensuremath{\perp}}^{2})$. We study both functions within a light-front constituent model pion, comparing results with different models corresponding nucleon from model. After evolution scale to relevant experimental...
The pentaquark $P_c^+(4450)$ recently discovered by LHCb has been interpreted as a bound state of $\Psi(2S)$ and nucleon. charmonium-nucleon interaction which provides the binding mechanism is given, in heavy quark limit, terms charmonium chromoelectric polarizabilities densities nucleon energy-momentum tensor (EMT). In this work we show model-independent way, exploring general properties effective interaction, that can form states with $\Delta$. Using Skyrme model to evaluate large-$N_c$...
The Sivers parton distribution has been predicted to obey a particular ``universality relation'', namely have opposite sign in semi-inclusive deeply inelastic scattering (SIDIS) and the Drell-Yan process. We discuss how, on basis of present HERMES data, this remarkable prediction QCD factorization approach description single spin asymmetries related effect could be checked experimentally future experiments at PAX COMPASS.
We present results for all leading-twist azimuthal spin asymmetries in semi-inclusive lepton-nucleon deep-inelastic scattering due to T-even transverse-momentum dependent parton distribution functions on the basis of a light-cone constituent quark model. Attention is paid discuss range applicability model, especially with regard scale dependence observables and distributions. find good agreement available experimental data predictions be further tested by future CLAS, COMPASS, HERMES data.
Transverse parton momentum dependent distribution functions (TMDs) of the nucleon are studied in a covariant model, which describes intrinsic motion partons terms distribution. The consistency approach is demonstrated, and model relations among TMDs studied. As by-product it shown how allows to formulate nonrelativistic limit.
We compute the quark and antiquark transversity distributions in nucleon at a low normalization point $(\ensuremath{\mu}\ensuremath{\approx}600$ MeV) large-${N}_{c}$ limit, where can be described as soliton of an effective chiral theory (chiral quark-soliton model). The flavor-nonsinglet $\ensuremath{\delta}u(x)\ensuremath{-}\ensuremath{\delta}d(x)$ $\ensuremath{\delta}\ifmmode \bar{u}\else \={u}\fi{}(x)\ensuremath{-}\ensuremath{\delta}\overline{d}(x)$ appear leading order ${1/N}_{c}$...
The Collins fragmentation function is extracted from HERMES data on azimuthal single spin asymmetries in semi-inclusive deeply inelastic scattering, and BELLE ${e}^{+}{e}^{\ensuremath{-}}$-annihilations. A Gaussian model assumed for the distribution of transverse parton momenta predictions are used chiral quark-soliton transversity function. We find that yield a consistent picture which compatible with COMPASS information previously obtained an analysis DELPHI data. Estimates future experiments made.
The leading twist transverse momentum dependent parton distribution function h_1T^perp, which is sometimes called ``pretzelosity,'' studied. We review the theoretical properties of this function, and present bag model predictions. observe an interesting relation valid in a large class relativistic models: difference between helicity transversity distributions, often said to be 'measure effects' nucleon, nothing but pretzelosity distribution. Pretzelosity chirally odd can accessed combination...
The nucleon form factors of the energy-momentum tensor are studied in nuclear medium framework in-medium modified Skyrme model. We obtain a negative D-term, agreement with results from other approaches, and find that effects make value d_1 more negative.
Intensity-correlation measurements, particularly by the two-photon fluorescence (TPF) technique, have become very popular for determining temporal behavior of laser emission on a picosecond time scale, although they are subject to considerable difficulties interpretation. The characteristics fluorescent intensity in TPF technique analyzed theoretically two different physically interesting and tractable models imperfectly mode-locked lasers: (i) partial-locking model where some modes locked...
We present the complete cross-section for production of unpolarized hadrons in semi-inclusive deep-inelastic scattering up to power-suppressed ${\cal O}(1/Q^2)$ terms Wandzura--Wilczek-type approximation which consists systematically assuming that $\bar{q}gq$--terms are much smaller than $\bar{q}q$--correlators. compute all twist-2 and twist-3 structure functions corresponding asymmetries, discuss applicability approximations on basis available data. make predictions can be tested by data...
Higher-twist transverse momentum dependent parton distribution functions (TMDs) are a valuable probe of the quark-gluon dynamics in nucleon, and play vital role for explanation sizable azimuthal asymmetries hadron production from unpolarized polarized deep-inelastic lepton-nucleon scattering observed experiments at CERN, DESY Jefferson Lab. The associated observables challenging to interpret, still await complete theoretical explanation, which makes guidance models valuable. In this work we...
The energy-momentum tensor (EMT) form factors pave new ways for exploring hadron structure. Especially the D-term related to EMT factor D(t) has received a lot of attention due its attractive physical interpretation in terms mechanical properties. We study nucleon and associated densities bag model which we formulate an arbitrary number colors Nc show that are consistently described this large-Nc limit. simplicity allows us test lucid way many theoretical concepts including recently...
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...