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6 results on '"Liuti, Simonetta"'

1. Probing Spin Dependent Quark and Gluon Distributions Through Azimuthal and Polarization Asymmetries.

Author

Goldstein, Gary R. and Liuti, Simonetta

Subjects
*PARTONS, *NUCLEAR particle research, *QUARKS, *HADRONS, *PHYSICS research
Abstract

Spin and transverse momentum dependent parton distributions - Generalized Parton Distributions, Transverse Momentum Distributions and related distributions - are at the interface between the QCD structure of the hadrons and observable quantities. The distributions are contained as linear superpositions within helicity amplitudes that factorize into universal forms at leading or next to leading order. These amplitudes are probed in high energy leptoproduction processes through angular dependent cross sections and polarization asymmetries. The phenomenological extraction of the amplitudes and the distributions is a challenging task. We will present some models for the distributions in leptoproduction processes, as well as the observables that connect with the quark-nucleon helicity amplitudes for different Deeply Virtual production possibilities. [ABSTRACT FROM AUTHOR]

Published
2016
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2. Quark-hadron duality in structure functions.

Author

Fantoni, Alessandra, Bianchi, Nicola, and Liuti, Simonetta

Subjects
QUARKS, PARTICLES (Nuclear physics), QUARK confinement, HADRONS, BARYONS, PARTONS
Abstract

The quark-hadron duality is studied in a systematic way for polarized and unpolarized structure functions, by taking into account all the available data in the resonance region. In both cases, a precise perturbative QCD based analysis to the integrals of the structure functions in the resonance region has been done: non perturbative contributions have been disentangled and the higher twist contributions have been evaluated. A different behavior for the unpolarized and polarized structure functions at lowQ2 has been found.PACS:quark-hadron duality - structure functions [ABSTRACT FROM AUTHOR]

Published
2005
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3. Angular momentum sum rule for spin-one hadronic systems.

Author

Taneja, Swadhin K., Kathuria, Kunal, Liuti, Simonetta, and Goldstein, Gary R.

Subjects
*ANGULAR momentum (Nuclear physics), *SUM rules (Physics), *HADRONS, *NUCLEAR spin, *GAUGE invariance, *COMPTON effect, *POLARIZATION (Nuclear physics)
Abstract

We derive a sum rule for the total quark angular momentum of a spin-one hadronic system within a gauge-invariant decomposition of the hadron's spin. We show that the total angular momentum can be measured through deeply virtual Compton scattering experiments using transversely polarized deuterons. [ABSTRACT FROM AUTHOR]

Published
2012
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6. Parton distributions and lattice-QCD calculations: Toward 3D structure.

Author

Constantinou, Martha, Courtoy, Aurore, Ebert, Markus A., Engelhardt, Michael, Giani, Tommaso, Hobbs, Tim, Hou, Tie-Jiun, Kusina, Aleksander, Kutak, Krzysztof, Liang, Jian, Lin, Huey-Wen, Liu, Keh-Fei, Liuti, Simonetta, Mezrag, Cédric, Nadolsky, Pavel, Nocera, Emanuele R., Olness, Fred, Qiu, Jian-Wei, Radici, Marco, and Radyushkin, Anatoly

Subjects
*PARTONS, *QUANTUM chromodynamics, *QUANTUM theory, *DISTRIBUTION (Probability theory), *HADRONS
Abstract

The strong force which binds hadrons is described by the theory of quantum chromodynamics (QCD). Determining the character and manifestations of QCD is one of the most important and challenging outstanding issues necessary for a comprehensive understanding of the structure of hadrons. Within the context of the QCD parton picture, the parton distribution functions (PDFs) have been remarkably successful in describing a wide variety of processes. However, these PDFs have generally been confined to the description of collinear partons within the hadron. New experiments and facilities provide the opportunity to additionally explore the transverse structure of hadrons which is described by generalized parton distributions (GPDs) and transverse-momentum-dependent parton distribution functions (TMD PDFs). In our previous report Lin et al. (2018), we compared and contrasted the two main approaches used to determine the collinear PDFs: the first based on perturbative QCD factorization theorems, and the second based on lattice-QCD calculations. In the present report, we provide an update of recent progress on the collinear PDFs, and also expand the scope to encompass the generalized PDFs (GPDs and TMD PDFs). We review the current state of the various calculations, and consider what new data might be available in the near future. We also examine how a shared effort can foster dialog between the PDF and lattice-QCD communities, and yield improvements for these generalized PDFs. [ABSTRACT FROM AUTHOR]

Published
2021
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