☆ 4.7 Article

Sivers and Boer-Mulders functions in light-cone quark models

PHYSICAL REVIEW D (2010)

Journal

PHYSICAL REVIEW D

Volume 81, Issue 11, Pages -

Publisher

AMER PHYSICAL SOC

DOI: 10.1103/PhysRevD.81.114013

Keywords

-

Categories

Astronomy & Astrophysics Physics, Particles & Fields

Funding

Research Infrastructure Integrating Activity [227431]
European Community
Italian MIUR [2008EKLACK]
U.S. Department of Energy [DE-AC02-05CH11231, DE-AC02-76SF00515]

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Abstract

Results for the naive-time-reversal-odd quark distributions in a light-cone quark model are presented. The final-state interaction effects are generated via single-gluon exchange mechanism. The formalism of light-cone wave functions is used to derive general expressions in terms of overlap of wave-function amplitudes describing the different orbital angular momentum components of the nucleon. In particular, the model predictions show a dominant contribution from S-and P-wave interference in the Sivers function and a significant contribution also from the interference of P and D waves in the Boer-Mulders function. The favorable comparison with existing phenomenological parametrizations motivates further applications to describe azimuthal asymmetries in hadronic reactions.

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Seidl, S. Sekula, K. Semenov-Tian-Shanskiy, D. Y. Shao, N. Sherrill, E. Sichtermann, M. Siddikov, A. Signori, B. K. Singh, S. Sirca, K. Slifer, W. Slominski, D. Sokhan, W. E. Sondheim, Y. Song, O. Soto, H. Spiesberger, A. M. Stasto, P. Stepanov, G. Sterman, J. R. Stevens, I. W. Stewart, I Strakovsky, M. Strikman, M. Sturm, M. L. Stutzman, M. Sullivan, B. Surrow, P. Svihra, S. Syritsyn, A. Szczepaniak, P. Sznajder, H. Szumila-Vance, L. Szymanowski, A. S. Tadepalli, J. D. Tapia Takaki, G. F. Tassielli, J. Terry, F. Tessarotto, K. Tezgin, L. Tomasek, F. Torales Acosta, P. Tribedy, A. Tricoli, Triloki, S. Tripathi, R. L. Trotta, O. D. Tsai, Z. Tu, C. Tuve, T. Ullrich, M. Ungaro, G. M. Urciuoli, A. Valentini, P. Vancura, M. Vandenbroucke, C. Van Hulse, G. Varner, R. Venugopalan, I Vitev, A. Vladimirov, G. Volpe, A. Vossen, E. Voutier, J. Wagner, S. Wallon, H. Wang, Q. Wang, X. Wang, S. Y. Wei, C. Weiss, T. Wenaus, H. Wennlof, N. Wickramaarachchi, A. Wikramanayake, D. Winney, C. P. Wong, C. Woody, L. Xia, B. W. Xiao, J. Xie, H. Xing, Q. H. Xu, J. Zhang, S. Zhang, Z. Zhang, Z. W. Zhao, Y. X. Zhao, L. Zheng, Y. Zhou, P. Zurita

Summary: This report describes the physics case, detector requirements, and evolving detector concepts for the Electron-Ion Collider (EIC) experimental program. The EIC will be a new facility in the United States with the capability to collide high-energy electron beams with high-energy proton and ion beams, providing access to regions dominated by gluons. The use of polarized beams in the EIC will allow for unprecedented access to the spatial and spin structure of particles. The report aims to advance the physics program and develop detector concepts that meet the requirements for the EIC.

NUCLEAR PHYSICS A (2022)

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Article Physics, Multidisciplinary

First Concurrent Extraction of the Leading-Order Scalar and Spin Proton Polarizabilities

E. Mornacchi, S. Rodini, B. Pasquini, P. Pedroni

Summary: By simultaneously extracting the six leading-order proton polarizabilities, we have set a milestone in the field. This achievement was made possible by new high-quality experimental data and an innovative fitting method based on bootstrapping. These results now serve as a fundamental benchmark for all future theoretical and experimental polarizability estimates.

PHYSICAL REVIEW LETTERS (2022)

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Article Physics, Particles & Fields

Perturbative calculations of gravitational form factors at large momentum transfer

Xuan-Bo Tong, Jian-Ping Ma, Feng Yuan

Summary: In this study, perturbative QCD analysis of the gravitational form factors of nucleon at large momentum transfer was conducted, leading to an explicit factorization formula in terms of twist-3 and twist-4 light-cone distribution amplitudes of nucleon. Numerical results of quark and gluon contributions to various GFFs, along with perturbative calculations of the scalar form factor <P'vertical bar F-2 vertical bar P> for pion and proton at large momentum transfer, were presented using model assumptions for the distribution amplitudes in the literature.

JOURNAL OF HIGH ENERGY PHYSICS (2022)

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Article Physics, Multidisciplinary

Nucleon Energy Correlators for the Color Glass Condensate

Hao-Yu Liu, Xiaohui Liu, Ji-Chen Pan, Feng Yuan, Hua Xing Zhu

Summary: We demonstrate that the recently proposed nucleon energy-energy correlator (NEEC) fEEC(x; theta) can reveal gluon saturation in the small-x regime in eA collisions. The novelty of this probe lies in its full inclusivity, similar to deep-inelastic scattering (DIS), but without the need for jets or hadrons, while still providing a clear window into the small-x dynamics through the shape of the theta distribution. We find that the saturation prediction differs significantly from the expectation of collinear factorization.

PHYSICAL REVIEW LETTERS (2023)

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Article Astronomy & Astrophysics

The gravitational form factors of the electron in quantum electrodynamics

Adam Freese, Andreas Metz, Barbara Pasquini, Simone Rodini

Summary: We calculate the gravitational form factors of the electron in quantum electrodynamics, decomposing them into contributions from the electron and photon parts of the energy-momentum tensor. The divergences are removed through renormalization in the MS scheme, and the infrared divergences are isolated and results are given using dimensional regularization and photon-mass regularization. The form factors provide information about the electron's energy and angular momentum structure in QED, as well as its mass radius. We compare our results with the existing literature whenever possible.

PHYSICS LETTERS B (2023)

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Article Physics, Particles & Fields

Machine learning-based jet and event classification at the Electron-Ion Collider with applications to hadron structure and spin physics

Kyle Lee, James Mulligan, Mateusz Ploskon, Felix Ringer, Feng Yuan

Summary: We explore the application of machine learning-based classifiers in the identification of jets and events at the future Electron-Ion Collider (EIC). Our study focuses on identifying the flavor of jets and the underlying hard process of events at low EIC energies. We propose various applications of machine learning-based jet identification in key research areas and compare the performance with that at the Large Hadron Collider. The methods can be applied on Monte Carlo event generators or experimental data.

JOURNAL OF HIGH ENERGY PHYSICS (2023)

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Article Physics, Particles & Fields

Transverse momentum dependent shape function for J/? production in SIDIS

Daniel Boer, Jelle Bor, Luca Maxia, Cristian Pisano, Feng Yuan

Summary: This article compares the order-αs and order-αs^2 transverse momentum dependent (TMD) expressions with the collinear ones for heavy quarkonium production in nonrelativistic QCD. It finds that the collinear expressions have discontinuities in the small transverse momentum limit, and demonstrates how to properly deal with them and include their finite contributions to the TMD shape functions.

JOURNAL OF HIGH ENERGY PHYSICS (2023)

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Article Astronomy & Astrophysics

Semi-inclusive diffractive deep inelastic scattering at small x

Yoshitaka Hatta, Bo-Wen Xiao, Feng Yuan

PHYSICAL REVIEW D (2022)

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Article Astronomy & Astrophysics

Near threshold heavy quarkonium photoproduction at large momentum transfer

Peng Sun, Xuan-Bo Tong, Feng Yuan

Summary: Perturbative QCD method is used to study the photoproduction of near threshold heavy quarkonium with large momentum transfer. The study considers the contributions from the leading three-quark Fock states of the nucleon, where the three-quark Fock state with one unit quark orbital angular momentum is found to dominate at the threshold. The study also shows that there is no direct connection between the near threshold heavy quarkonium photoproduction and the gluonic gravitational form factors without additional approximation. Predictions for psi' and Upsilon (1S,2S) states are made based on the comparison between the results and recent GlueX data, which can be tested in future experiments.

PHYSICAL REVIEW D (2022)

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