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Albino L, Higuera-Angulo I, Raya K, Bashir A. Pseudoscalar mesons: Light front wave functions, GPDs, and PDFs. Int J Clin Exp Med 2022. [DOI: 10.1103/physrevd.106.034003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Chávez JMM, Bertone V, De Soto Borrero F, Defurne M, Mezrag C, Moutarde H, Rodríguez-Quintero J, Segovia J. Accessing the Pion 3D Structure at US and China Electron-Ion Colliders. PHYSICAL REVIEW LETTERS 2022; 128:202501. [PMID: 35657889 DOI: 10.1103/physrevlett.128.202501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Revised: 12/22/2021] [Accepted: 03/03/2022] [Indexed: 06/15/2023]
Abstract
We present the first systematic feasibility study of accessing generalized parton distributions of the pion at an electron-ion collider through deeply virtual Compton scattering. Relying on state-of-the-art models for pion GPDs, we show that quarks and gluons interfere destructively, modulating the expected event rate and maximizing it when parton content is generated via radiation from valence dressed quarks. Moreover, gluons are found to induce a sign inversion for the beam-spin asymmetry in every model studied, being a clear signal for pinning down the regime of gluon superiority.
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Affiliation(s)
- José Manuel Morgado Chávez
- Department of Integrated Sciences and Center for Advanced Studies in Physics, Mathematics and Computation, University of Huelva, E-21071 Huelva, Spain
| | - Valerio Bertone
- Irfu, CEA, Université Paris-Saclay, 91191 Gif-sur-Yvette, France
| | - Feliciano De Soto Borrero
- Departamento de Sistemas Físicos, Químicos y Naturales, Universidad Pablo de Olavide, E-41013 Sevilla, Spain
| | - Maxime Defurne
- Irfu, CEA, Université Paris-Saclay, 91191 Gif-sur-Yvette, France
| | - Cédric Mezrag
- Irfu, CEA, Université Paris-Saclay, 91191 Gif-sur-Yvette, France
| | - Hervé Moutarde
- Irfu, CEA, Université Paris-Saclay, 91191 Gif-sur-Yvette, France
| | - José Rodríguez-Quintero
- Department of Integrated Sciences and Center for Advanced Studies in Physics, Mathematics and Computation, University of Huelva, E-21071 Huelva, Spain
| | - Jorge Segovia
- Departamento de Sistemas Físicos, Químicos y Naturales, Universidad Pablo de Olavide, E-41013 Sevilla, Spain
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Alexandrou C, Bacchio S, Bergner G, Finkenrath J, Gasbarro A, Hadjiyiannakou K, Jansen K, Kostrzewa B, Ottnad K, Petschlies M, Pittler F, Steffens F, Urbach C, Wenger U. Quark and Gluon Momentum Fractions in the Pion from N_{f}=2+1+1 Lattice QCD. PHYSICAL REVIEW LETTERS 2021; 127:252001. [PMID: 35029455 DOI: 10.1103/physrevlett.127.252001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2021] [Accepted: 11/03/2021] [Indexed: 06/14/2023]
Abstract
We perform the first full decomposition of the pion momentum into its gluon and quark contributions. We employ an ensemble generated by the Extended Twisted Mass Collaboration with N_{f}=2+1+1 Wilson twisted mass clover fermions at maximal twist tuned to reproduce the physical pion mass. We present our results in the MS[over ¯] scheme at 2 GeV. We find ⟨x⟩_{u+d}=0.601(28), ⟨x⟩_{s}=0.059(13), ⟨x⟩_{c}=0.019(05), and ⟨x⟩_{g}=0.52(11) for the separate contributions, respectively, whose sum saturates the momentum sum rule.
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Affiliation(s)
- Constantia Alexandrou
- Department of Physics, University of Cyprus, Nicosia 2109, Cyprus
- Computation-based Science and Technology Research Center, The Cyprus Institute, Nicosia 2121, Cyprus
| | - Simone Bacchio
- Computation-based Science and Technology Research Center, The Cyprus Institute, Nicosia 2121, Cyprus
| | - Georg Bergner
- Institute of Theoretical Physics, Friedrich Schiller University Jena, Jena 07743, Germany
| | - Jacob Finkenrath
- Computation-based Science and Technology Research Center, The Cyprus Institute, Nicosia 2121, Cyprus
| | - Andrew Gasbarro
- Albert Einstein Center, Institute for Theoretical Physics, University of Bern, Bern CH-3012, Switzerland
| | - Kyriakos Hadjiyiannakou
- Department of Physics, University of Cyprus, Nicosia 2109, Cyprus
- Computation-based Science and Technology Research Center, The Cyprus Institute, Nicosia 2121, Cyprus
| | | | - Bartosz Kostrzewa
- High Performance Computing and Analytics Lab, Rheinische Friedrich-Wilhelms-Universität Bonn, Bonn 53115, Germany
| | - Konstantin Ottnad
- PRISMA+ Cluster of Excellence and Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, Mainz 55099, Germany
| | - Marcus Petschlies
- Helmholtz-Institut für Strahlen- und Kernphysik, University of Bonn, Bonn 53115, Germany
- Bethe Center for Theoretical Physics, University of Bonn, Bonn 53115, Germany
| | - Ferenc Pittler
- Computation-based Science and Technology Research Center, The Cyprus Institute, Nicosia 2121, Cyprus
| | - Fernanda Steffens
- Helmholtz-Institut für Strahlen- und Kernphysik, University of Bonn, Bonn 53115, Germany
- Bethe Center for Theoretical Physics, University of Bonn, Bonn 53115, Germany
| | - Carsten Urbach
- Helmholtz-Institut für Strahlen- und Kernphysik, University of Bonn, Bonn 53115, Germany
- Bethe Center for Theoretical Physics, University of Bonn, Bonn 53115, Germany
| | - Urs Wenger
- Albert Einstein Center, Institute for Theoretical Physics, University of Bern, Bern CH-3012, Switzerland
- Department of Theoretical Physics, CERN, Geneva CH-1211, Switzerland
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Abstract
The Lagrangian that defines quantum chromodynamics (QCD), the strong interaction piece of the Standard Model, appears very simple. Nevertheless, it is responsible for an astonishing array of high-level phenomena with enormous apparent complexity, e.g., the existence, number and structure of atomic nuclei. The source of all these things can be traced to emergent mass, which might itself be QCD’s self-stabilising mechanism. A background to this perspective is provided, presenting, inter alia, a discussion of the gluon mass and QCD’s process-independent effective charge and highlighting an array of observable expressions of emergent mass, ranging from its manifestations in pion parton distributions to those in nucleon electromagnetic form factors.
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