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23/05/2022, 14:00
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Daniel Boer (University of Groningen)23/05/2022, 14:15Longer talk
An overview of the progress regarding the transversity distribution, the tensor charge and other transverse spin distributions will be given. Gluonic analogues will be discussed, as well as
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transversity GPDs and GTMDs. -
Matthias Grosse Perdekamp (University of Ilinois)23/05/2022, 14:45Longer talk
TMD Measurements at high momentum transfer have been carried out in polarized proton-proton collisions at RHIC, in pion induced Drell-Yan scattering off transversely polarized proton targets in COMPASS and in electron-positron annihilation in Belle and BaBar. Available results will be reviewed and the impact of future measurements at RHIC and the SPS will be discussed.
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Andrea Bressan (Istituto Nazionale di Fisica Nucleare)23/05/2022, 15:15Longer talk
A review of recent SIDIS results about transverse spin and momentum dependent observables will be given. Results that are expected to come in the near future from running experiments will also be discussed.
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Feng Yuan (Lawrence Berkeley Lab)23/05/2022, 15:45Longer talk
In this talk, I will present our recent results on nucleon tomography study by utilizing jet observables in various hadronic collisions.
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Franco Bradamante (Istituto Nazionale di Fisica Nucleare)23/05/2022, 16:45Longer talk
The SIDIS data collected from 2002 to 2010 in COMPASS using a high energy muon beam and transversely polarised proton and deuteron targets, have allowed to performed many unique measurements. In this talk the main results and their interpretation, as well as the new expected measurements, will be reviewed. The need of the more deuteron data and the perspectives from the future COMPASS data...
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Christopher Dilks (Duke University)23/05/2022, 17:15Longer talk
Correlators such as parton distribution functions (PDFs) exhibit flavor dependence, which is accessible from complementary Semi-Inclusive Deep Inelastic Scattering (SIDIS) measurements with proton and neutron targets. SIDIS off the neutron can be explored using nuclear targets, in particular the deuteron, wherein the quark flavor combination differs from that of the proton. Recent...
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Aurore Courtoy (Instituto de Física, UNAM)23/05/2022, 17:45Remote standard talk
In this short talk, we discuss chiral-odd PDFs that can be accessed through dihadron observables: the transversity PDF and the twist-3 scalar PDF e(x).
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The former is subject to positivity constraints, the Soffer bound. Recent analyses have explored the role of theoretical constraints on the tensor charge. We comment on that point, in view of future improvements in all global analyses.
As for... -
Timothy Hayward (University of Connecticut)23/05/2022, 18:05Standard talk
We report the first measurements of deep inelastic scattering spin-dependent azimuthal asymmetries in back-to-back hadron electroproduction, where one hadron is produced in the current fragmentation region and the other in the target fragmentation region. The data were taken with a 10.2 and 10.6 GeV longitudinally polarized electron beam incident on an unpolarized liquid hydrogen target using...
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Prof. Fatiha Benmokhtar (Duquesne University)23/05/2022, 18:25Remote standard talk
Studies of the properties and the azimuthal distribution of hadrons produced in the Target Fragmentation Region serve as a test of our complete understanding of the different mechanisms in the SIDIS production of hadrons and provide additional information on the QCD dynamics that are not accessible with single hadron production in the Current Fragmentation Region. We present first...
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Andrea Signori (Istituto Nazionale di Fisica Nucleare)24/05/2022, 09:00Longer talk
In this talk I will briefly address the state of the art for our understanding of transverse-momentum-dependent distributions, with a focus on their phenomenology. I will introduce some of the topics which are currently under investigation and highlight the fundamental role of the present and future experimental facilities for the advancement of the field.
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Ralf Seidl (RIKEN)24/05/2022, 09:30Remote longer talk
Single and dihadron fragmentation functions (FFs) are an essential tool in accessing the transverse spin and momentum structure of the nucleon. The chiral-odd FFs provide nearly unique access to the transvsersity distributions and the related tensor charges. Transverse momentum dependent FFs enable the study of various transverse momentum dependent distribution functions in the nucleon....
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Jan Matousek (Charles University, Prague)24/05/2022, 10:00Longer talk
In semi-inclusive deep inelastic scattering (SIDIS) the non-zero transverse momentum of partons is reflected in the transverse momentum $P_T$ of the produced hadrons. Assuming Gaussian dependence of transverse momentum dependent (TMD) PDFs and fragmentation functions (FFs) upon quark transverse momentum, exponential distribution of $P_T^2$ is expected. In 2016 and 2017, COMPASS experiment at...
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Andrea Moretti (Istituto Nazionale di Fisica Nucleare)24/05/2022, 10:30Longer talk
The azimuthal asymmetries, given by the amplitudes of the modulations in the azimuthal angle $\phi_{h}$ of the hadrons produced in SIDIS, give access to the Transverse-Momentum-Dependent structure of the nucleon. In unpolarized SIDIS, of particular interest are the $\cos\phi_{h}$ and $\cos2\phi_{h}$ modulations, generated by the Cahn effect and by the Boer-Mulders TMD PDF $h_1^{\perp}$,...
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Valerio Bertone (CEA Paris-Sclay)24/05/2022, 11:30Longer talk
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24/05/2022, 12:00Longer talk
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Maria Zurita (Brookhaven National Laboratory)24/05/2022, 14:30Longer talk
Transverse momentum dependent (TMD) distributions match collinear parton density functions (PDF) in the limit of small transverse distances, which is accounted for by global extractions of TMD distributions. We study the influence of the PDF choice on the determination of unpolarized TMDPDFs and the description of TMD Drell-Yan-pair and Z-boson production data. We find that PDF essentially...
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Daniel Pitonyak (Lebanon Valley College)24/05/2022, 15:00Remote longer talk
In this talk, I will discuss our update to the global analysis of transverse single-spin asymmetries that now extracts the novel quark-gluon-quark fragmentation function \tilde{H} and explores the role played by the Soffer bound on transversity and lattice QCD computations of the isovector tensor charge.
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Dr Haiyan Gao (Brookhaven National Laboratory)24/05/2022, 15:30Remote longer talk
In this presentation, I will discuss the physics opportunities with the Electron-Ion Collider (EIC) and the current status of the EIC.
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Marco Zaccheddu (Istituto Nazionale di Fisica Nucleare)24/05/2022, 16:30Standard talk
Data from Belle Collaboration for associated (with a light unpolarized hadron) and single-inclusive production of transversely polarized $\Lambda$-hyperons in $e^+e^-$ annihilation processes allowed to extract, for the first time, the $\Lambda$ polarizing fragmentation function, by adopting a simplified TMD approach. Recent theoretical developments on the computation of cross sections for...
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Andrea Simonelli (Istituto Nazionale di Fisica Nucleare)24/05/2022, 16:50Standard talk
Extending TMD factorization to thrust-dependent observables entails difficulties ultimately associated with the behavior of soft radiation. As a consequence, the definition of the TMDs has to be revised, while keeping (and extending) its universality properties. Moreover, the regularization of the rapidity divergences intertwines with the thrust dependence, leading to a new kind of...
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Aleksandra Lelek (UAntwerp)24/05/2022, 17:10Standard talk
Soft gluon resummation is essential to obtain precise predictions for QCD processes with more scales involved. The formalism to follow in such scenarios is the Transverse Momentum Dependent factorization theorem. However, for practical applications a Monte Carlo approach is needed. We present the Parton Branching (PB) method- a Monte Carlo approach to obtain QCD collider predictions based on...
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Albi Kerbizi (Istituto Nazionale di Fisica Nucleare)24/05/2022, 17:30Standard talk
Being motivated mainly by the LHC physics, the currently used Monte Carlo Event Generators (MCEGs) lack of the quark spin degree of freedom in their hadronization models, and can not reproduce observed transverse spin effects such as the Collins and the dihadron asymmetries, and longitudinal spin effects such as the jet handedness. To guide the interpretation of SIDIS and $𝑒^+𝑒^−$ data as well...
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Caroline Costa (Jefferson Lab)24/05/2022, 17:50Standard talk
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James Moore24/05/2022, 18:10
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Harut Avagyan (Jefferson Lab)25/05/2022, 09:00Longer talk
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Raphaël Dupré (IJCLab - CNRS - Univ. Paris-Saclay)25/05/2022, 09:30Longer talk
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Nicole D'Hose25/05/2022, 10:00Longer talk
Deeply Virtual Compton Scattering (DVCS) and Hard Exclusive Meson Production (HEMP) are valuable processes to study Generalized Parton Distributions (GPDs). By correlating the longitudinal momentum of the partons to their transverse spatial distribution inside the nucleon, GPDs reveal the 3-dimensional structure of the nucleon in QCD. Following a test run in 2012, exclusive measurements were...
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Adam Hobart (IJCLab CNRS-IN2P3)25/05/2022, 10:30Longer talk
A key step towards a better understanding of the nucleon structure is the study of Generalized Parton Distributions (GPDs). GPDs are nowadays the object of an intense effort of research since they convey an image of the nucleon structure where the longitudinal momentum and the transverse spatial position of the partons inside the nucleon are correlated. Moreover, GPDs give access to the...
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Kresimir Kumericki (University of Zagreb)25/05/2022, 11:30Longer talk
We will report on recent attempts to access universal
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GPDs from Deeply virtual Compton scattering and Deeply
virtual meson production. -
Paweł Sznajder (National Centre for Nuclear Research, Poland)25/05/2022, 12:00Longer talk
We discuss the problem of model dependency in the phenomenology of generalised parton distributions (GPDs). We present results of our resent analyses, where we have addressed this problem. This includes the extraction of D-term, which is related to the so-called mechanical properties of the nucleon, and the analysis on the deconvolution of deeply virtual Compton scattering (DVCS) amplitudes. A...
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Shohini Bhattacharya (BNL)25/05/2022, 12:30Longer talk
Generalized TMDs (GTMDs) of hadrons are the most general two-parton correlation functions. The Fourier transforms of GTMDs are partonic Wigner functions. During the past few years, several interesting developments have taken place in this field. In this talk, we give a brief overview of these objects and the various developments that has taken place, including, in particular, the...
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Simonetta Liuti (University of Virginia)25/05/2022, 13:00Standard talk
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Miguel Echevarria (University of the Basque Country UPV/EHU)26/05/2022, 09:00Longer talk
I will discuss how quarkonium production can be used to probe transverse-momentum-dependent functions (TMDs), and the role played by a new type of non-perturbative functions: the TMD shape functions.
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Cristian Pisano (Istituto Nazionale di Fisica Nucleare)26/05/2022, 09:30Longer talk
We study the polar and azimuthal decay angular distributions of $J/\psi$ mesons produced in semi-inclusive, deep-inelastic electron-proton scattering. For the description of the quarkonium formation mechanism, we adopt the framework of nonrelativistic QCD, with the inclusion of the intermediate color-octet channels that are suppressed at most by a factor $v^4$ in the velocity parameter $v$...
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Felix Ringer (YITP Stony Brook)26/05/2022, 10:00Longer talk
I will discuss recent calculations of jet correlation and substructure observables relevant for spin asymmetries and nucleon structure
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Ignazio Scimemi (Universidad Complutense Madrid)26/05/2022, 10:30Longer talk
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Emanuele Nocera (The University of Edinburgh)26/05/2022, 11:30Longer talk
I critically appraise current limitations in precision and accuracy of collinear parton distribution and fragmentation function determination. I focus on open issues related to quantifying data inconsistencies, theoretical uncertainties, and methodological bias. I discuss their relevance in relationship with ongoing and future experimental programs at particle colliders.
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Werner Vogelsang (Univ. Tuebingen)26/05/2022, 12:00Longer talk
We compute the single-spin asymmetry A_UL in semi-inclusive
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deep-inelastic scattering of unpolarized leptons and longitudinally polarized
protons at large transverse momentum of the produced hadron. Our calculation is
performed in collinear factorization at the lowest order of QCD perturbation
theory. For photon exchange the asymmetry is T-odd and receives contributions
from the... -
Alessandro Vicini (Istituto Nazionale di Fisica Nucleare)26/05/2022, 12:30Longer talk
I will introduce the problem of the determination of the W boson mass at hadron colliders and the role of non-perturbative effects.
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Dr Juan Manuel Cruz Martinez (Università degli Studi di Milano)26/05/2022, 14:15Longer talk
In this talk we present the methodology used in the NNPDF4.0 global analysis. We introduce state of the art techniques in Machine Learning applied to PDF determination, automatised hyperparameter selection and tests to asses the quality and reliability of the methodology.
The entire methodology is open sourced and available for users willing to perform their own PDF analysis.
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Marc Schlegel (University of Tuebingen)26/05/2022, 14:45Longer talk
Some spin observables in the collinear twist-3 formalism will be reviewed.
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W. W. Jacobs (CEEM / Indiana University)26/05/2022, 15:15Longer talk
The STAR Collaboration at RHIC investigates the internal spin structure of the proton with a broad range of measurements in polarized $pp$ collisions. Transverse spin studies aim to elucidate 3D transverse momentum structure and parton transversity. Dijet opening angle measurements are sensitive to the Sivers $\langle k_T \rangle$ and a non-zero spin dependent result in $pp$ collisions is...
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Jose Osvaldo Gonzalez Hernandez (Istituto Nazionale di Fisica Nucleare)26/05/2022, 16:15
Phenomenological analyses of hadron structure from semi-inclusive observables require the use of models to characterize nonperturbative effects, embedded into a formalism of TMD evolution. Constraints provided by pQCD calculations must be imposed in order to maximize predictive power. This is particularly important when attempting to use phenomenological extractions over wide scale...
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Simone Rodini (University of Regensburg)26/05/2022, 16:35Standard talk
The TMD factorization at the next-to-leading power has an involved structure of singularities. I discuss the definition and properties of transverse momentum dependent (TMD) distributions of the twist-three including evolution, symmetry relations, parametrization, interpretation, and singularities. I demonstrate that the physical TMD distributions (in terms of which observables are written)...
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Luca Maxia (Istituto Nazionale di Fisica Nucleare)26/05/2022, 16:55Standard talk
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Raj Kishore (IIT Kanpur)26/05/2022, 17:15Remote standard talk
We present an estimate of the cos$2\phi$ azimuthal asymmetry in back-to-back production of $J/\psi$ and a jet in the process: $e~p\to e~J/\psi~Jet~X$. We calculate the asymmetry using TMD factorization in a generalized parton model (GPM) framework and use non-relativistic QCD (NRQCD) to obtain the $J/\psi$ production rate. We incorporate both color singlet and color octet contributions to the...
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Christine Aidala (University of Michigan)26/05/2022, 17:35Remote standard talk
An overview of recent results from PHENIX on transverse spin and transverse-momentum-dependent observables will be presented.
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Stella Schindler26/05/2022, 17:55Remote standard talk
Non-perturbative parton distributions that arise in the TMD factorization of cross-sections have dynamics dominated by the lightcone. This renders them inaccessible to direct lattice QCD calculations due to the sign problem in real-time calculations. To circumvent this issue, one may construct a lattice-calculable TMD that shares the same IR physics as the physical TMD appearing in...
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Prof. Shunzo Kumano (Japan Women's University / KEK)27/05/2022, 09:00Remote longer talk
There was recent theoretical progress on transverse-momentum-dependent parton distribution functions (TMDs) and parton distribution functions (PDFs) for spin-1 hadrons at twists 3 and 4. We expect that the field of structure functions for spin-1 hadrons will become an interesting topic in 2020's and 2030' due to experimental projects at the Jefferson Laboratory, the Fermilab, the NICA, the...
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Savvas Zafeiropoulos27/05/2022, 09:30Remote longer talk
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Simone Bacchio (The Cyprus Institute)27/05/2022, 10:00Standard talk
I will present an overview of recent progress and results in Lattice QCD focusing on the direct measure of moments of the transversity PDF, as well as using the quasi-PDF/GPD approach.
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Michael Wagman (Fermilab)27/05/2022, 10:30
The Collins-Soper kernel describing the rapidity evolution of TMDPDFs is nonperturbative for large transverse separations or small transverse momenta. I will discuss recent lattice QCD calculations that aim to determine the nonperturbative behavior of the quark Collins-Soper kernel.
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Riccardo Longo (University of Illinois at Urbana-Champaign)27/05/2022, 11:30Longer talk
The investigation of the nucleon spin structure via measurements of dimuons produced in the Drell-Yan process is one of the main goals of the phase-II research program of the COMPASS experiment (M2 beamline, SPS, CERN).
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In 2015 and 2018, COMPASS performed Drell-Yan measurements using a 190 GeV/c $\pi^-$ beam impinging on a transversely polarized NH$_3$ target and on an unpolarized tungsten... -
Noah Wuerfel27/05/2022, 12:00Longer talk
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Pasquale Di Nezza (Istituto Nazionale di Fisica Nucleare)27/05/2022, 12:30Longer talk
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Gunar Schnell (University of the Basque Country UPV/EHU)27/05/2022, 14:30Longer talk
After fifty years of investigations, the nucleon structure is still far from being understood and continues to represent a unique test bench for QCD. Despite the enormous progresses achieved in five decades of deep-inelastic scattering (DIS) experiments, a number of crucial open questions are still on the carpet and subject of intense theoretical and experimental studies. In the last two...
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Aram Kotzinian (Istituto Nazionale di Fisica Nucleare)27/05/2022, 15:00Longer talk
Fracture functions describes the hadron production in the target fragmentation region (TFR) in the hard processes, namely -- the spin and transverse momentum dependent correlations between struck parton in the target and produced hadron in TFR.
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In this talk I'll shortly describe the formalism and present the theoretical results for SIDIS and Drell-Yan processes.
New experimental results on... -
Nobuo Sato (Jefferson Lab)27/05/2022, 15:30Longer talk
We will discuss recent updates from JAM on gluon polarization in the nucleon and polarized sea asymmetries and the role of the various theoretical constraints, in particular positivity constraints.
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Alessandro Bacchetta (Istituto Nazionale di Fisica Nucleare)27/05/2022, 16:00
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Timothy Hayward (University of Connecticut)Standard talk
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Michael Wagman (MIT)Longer talk
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Jose Osvaldo Gonzalez Hernandez (Istituto Nazionale di Fisica Nucleare)Standard talk
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Alexey VladimirovLonger talk
I present the study of the TMD distributions of twist-three. It includes definition, interpretation, symmetry properties, and LO evolution equations. I show that the evolution of twist-three TMD distributions is essentially simplified in the large-Nc limit.
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Pawel Sznajder (National Centre for Nuclear Research, Warsaw)Longer talk
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Zahari Kassabov (University of Cambridge)Standard talk
I discuss different aspects of the interplay between determinations of Parton Distribution Functions and constraints of Effective Field Theories based on fits collider data.
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Rajesh Sangem (Istituto Nazionale di Fisica Nucleare)Standard talk
We investigate the photoproduction of quarkonium pairs at EIC kinematical region by exploring the contributions from single-parton scatterings and double-parton scatterings. The NRQCD framework is used for the quarkonium formation mechanism.
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Simone BacchioLonger talk
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Simone Rodini (University of Regensburg)Standard talk
Transverse-momentum dependent parton distributions are genuine non-perturbative functions that describe the 3-dimensional structure of a hadron. These distributions should be extracted from data. However, even if one restricts himself to the leading power distributions, eight of them has to be considered. A way to reduce the complexity, they can be evaluated in a model-independent way in...
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Maria Zurita (Brookhaven National Laboratory)Longer talk
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Daniel Boer (University of Groningen)Longer talk
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Christine Aidala (University of Michigan)Remote standard talk
An overview of recent results from PHENIX on transverse spin and transverse-momentum-dependent observables will be presented.
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Christine Aidala (University of Michigan)Remote standard talk
An overview of recent results from PHENIX on transverse spin and transverse-momentum-dependent observables will be presented.
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Aurore Courtoy (Instituto de Física, UNAM)Remote standard talk
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