P. Schweitzer
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View article: Parton Distribution Functions and their Generalizations
Parton Distribution Functions and their Generalizations Open
This article is an introduction to parton distribution functions and their generalizations which describe the quark and gluon structure of hadrons, and can be measured in various high-energy scattering processes. We provide the theoretical…
View article: Pressure Inside Hadrons: Criticism, Conjectures, and All That
Pressure Inside Hadrons: Criticism, Conjectures, and All That Open
The interpretation of the energy-momentum tensor form factor \(D(t)\) of hadrons in terms of pressure and shear force distributions is discussed, concerns raised in the literature are reviewed, and ways to reconcile the concerns with the i…
View article: Chiral-odd GPDs in the bag model
Chiral-odd GPDs in the bag model Open
A study of chiral-odd generalized parton distributions (GPDs) of the nucleon is presented in the bag model demonstrating that in this model all four chiral-odd GPDs are non-zero contrary to other claims in literature. The bag model results…
View article: <i>Colloquium</i>: Gravitational form factors of the proton
<i>Colloquium</i>: Gravitational form factors of the proton Open
The physics of the gravitational form factors of the proton, and their understanding within quantum chromodynamics, has advanced significantly in the past two decades through both theory and experiment. Furthermore, this Colloquium provide…
View article: The Drell-Yan process with pions and polarized nucleons
The Drell-Yan process with pions and polarized nucleons Open
The Drell-Yan process provides important information on the internal struc- ture of hadrons including transverse momentum dependent parton distribution functions (TMDs). In this work we present calculations for all leading twist structure …
View article: TMD Handbook
TMD Handbook Open
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 distribution of p…
View article: Exactly solvable models of nonlinear extensions of the Schrödinger equation
Exactly solvable models of nonlinear extensions of the Schrödinger equation Open
A method is presented to construct exactly solvable nonlinear extensions of the Schrödinger equation. The method explores a correspondence which can be established under certain conditions between exactly solvable ordinary Schrödinger equa…
View article: Risky Futures
Risky Futures Open
Of course, the answer rests with us humans, this strange species that managed to bring our planet to the brink of self-destruction.The good news is that an increasing number of people on earth are beginning to understand that we cannot aff…
View article: Quark-model relations among TMDs in the parton model
Quark-model relations among TMDs in the parton model Open
The covariant parton model (CPM) is a consequent application of the parton model concept to the nucleon structure. In this model, there is a choice to put quarks either in a pure-spin state or in a mixed-spin state. We show that the mixed-…
View article: Foreword
Foreword Open
Environmental and geopolitical discussions about the future of humanity have recently centred on the Arctic.This development can be seen as having been triggered by a bundle of complex interconnections, ranging from the rapidity of Arctic …
View article: Quark-model relations among TMDs in the parton model
Quark-model relations among TMDs in the parton model Open
The covariant parton model (CPM) is a consequent application of the parton model concept to the nucleon structure. In this model, there is a choice to put quarks either in a pure-spin state or in a mixed-spin state. We show that the mixed-…
View article: Risky Futures: Climate, Geopolitics and Local Realities in the Uncertain Circumpolar North
Risky Futures: Climate, Geopolitics and Local Realities in the Uncertain Circumpolar North Open
The volume examines complex intersections of environmental conditions, geopolitical tensions and local innovative reactions characterising ‘the Arctic’ in the early twenty-first century. What happens in the region (such as permafrost thaw …
View article: Visualization of internal forces inside the proton in a classical relativistic model
Visualization of internal forces inside the proton in a classical relativistic model Open
A classical model of a stable particle of finite size is studied. The model parameters can be chosen such that the described particle has the mass and radius of a proton. Using the energy-momentum tensor (EMT), we show how the presence of …
View article: 2D energy-momentum tensor distributions of nucleon in a large-$N_c$ quark model from ultra-relativistic to non-relativistic limit
2D energy-momentum tensor distributions of nucleon in a large-$N_c$ quark model from ultra-relativistic to non-relativistic limit Open
Form factors of the energy-momentum tensor (EMT) can be interpreted in certain frames in terms of spatial distributions of energy, stress, linear and angular momentum, based on 2D or 3D Fourier transforms. This interpretation is in general…
View article: Structure of the nucleon at leading and subleading twist in the covariant parton model
Structure of the nucleon at leading and subleading twist in the covariant parton model Open
The covariant parton model is generalized to describe quark correlators in a\nsystematic way. Previous results are reproduced for the T-even leading-twist\ntransverse momentum dependent parton distribution functions (TMDs), and for the\nfi…
View article: Introduction
Introduction Open
This introduction attempts to situate railroads, which have rarely been the object of ethnographic attention, within current debates of anthropology and related disciplines. While mobility is certainly one dimension of human-railroad entan…
View article: Effects of long-range forces on the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>D</mml:mi></mml:math>-term and the energy-momentum structure
Effects of long-range forces on the -term and the energy-momentum structure Open
The hadronic form factors of the energy-momentum tensor (EMT) have attracted\nconsiderable interest in recent literature. This concerns especially the D-term\nform factor D(t) with its appealing interpretation in terms of internal forces.\…
View article: Probing Nucleons and Nuclei in High Energy Collisions
Probing Nucleons and Nuclei in High Energy Collisions Open
This volume is a collection of contributions for the 7-week program "Probing Nucleons and Nuclei in High Energy Collisions" that was held at the Institute for Nuclear Theory in Seattle, WA, USA, from October 1 until November 16, 2018. The …
View article: Energy momentum tensor and the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>D</mml:mi></mml:math> term in the bag model
Energy momentum tensor and the term in the bag model Open
The energy momentum tensor (EMT) form factors pave new ways for exploring hadron structure. Especially, the $\\mathit{D}$-term related to the EMT form factor $D_{(t)}$ has received a lot of attention due to its attractive physical interpre…
View article: Mechanical properties of particles
Mechanical properties of particles Open
Selected topics related to the physics of the energy-momentum tensor (EMT) form factors are discussed. The topics are: 1) Fundamental mechanical properties of particles and gravity 2) Mechanical properties of non-spherical particles 3) Gra…
View article: Applications of the WW-type approximation to SIDIS
Applications of the WW-type approximation to SIDIS Open
We explore the complete cross-section for the production of unpolarized hadrons in semi-inclusive deep-inelastic scattering up to power-suppressed $\mathcal{O}(1/Q^2)$ terms in the Wandzura-Wilczek-type (WW-type) approximation, which consi…
View article: Energy-momentum tensor densities in the bag model
Energy-momentum tensor densities in the bag model Open
The form factors of the energy-momentum tensor can be accessed via studies of generalized parton distributions in hard exclusive reactions. In this talk we present recent results on the energy-momentum tensor form factors and densities in …
View article: Applications of the WW-type approximation to SIDIS
Applications of the WW-type approximation to SIDIS Open
We explore the complete cross-section for the production of unpolarized hadrons in semi-inclusive deep-inelastic scattering up to power-suppressed $\mathcal{O}(1/Q^2)$ terms in the Wandzura-Wilczek-type (WW-type) approximation, which consi…
View article: Energy-momentum tensor densities in the bag model
Energy-momentum tensor densities in the bag model Open
The form factors of the energy-momentum tensor can be accessed via studies of generalized parton distributions in hard exclusive reactions. In this talk we present recent results on the energy-momentum tensor form factors and densities in …
View article: Semi-inclusive deep inelastic scattering in Wandzura-Wilczek-type approximation
Semi-inclusive deep inelastic scattering in Wandzura-Wilczek-type approximation Open
We present the complete cross-section for the production of unpolarized hadrons in semi-inclusive deep-inelastic scattering up to power-suppressed O (1/ Q 2 ) terms in the Wandzura–Wilczek-type approximation which consists in systematicall…
View article: Pretzelosity distribution function h(1T)**perpendicular
Pretzelosity distribution function h(1T)**perpendicular Open
The 'pretzelosity' distribution is discussed. Theoretical properties, model results, and perspectives to access experimental information on this leading twist, transverse momentum dependent parton distribution function are reviewed. Its re…