A Guide to Light-Cone PDFs from Lattice QCD: An Overview of Approaches, Techniques, and Results
Within the theory of Quantum Chromodynamics (QCD), the rich structure of hadrons can be quantitatively characterized, among others, using a basis of universal nonperturbative functions: parton distribution functions (PDFs), generalized parton distributions (GPDs), transverse momentum dependent parto...
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Wiley
2019-01-01
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| Series: | Advances in High Energy Physics |
| Online Access: | http://dx.doi.org/10.1155/2019/3036904 |
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| author | Krzysztof Cichy Martha Constantinou |
| author_facet | Krzysztof Cichy Martha Constantinou |
| author_sort | Krzysztof Cichy |
| collection | DOAJ |
| description | Within the theory of Quantum Chromodynamics (QCD), the rich structure of hadrons can be quantitatively characterized, among others, using a basis of universal nonperturbative functions: parton distribution functions (PDFs), generalized parton distributions (GPDs), transverse momentum dependent parton distributions (TMDs), and distribution amplitudes (DAs). For more than half a century, there has been a joint experimental and theoretical effort to obtain these partonic functions. However, the complexity of the strong interactions has placed severe limitations, and first-principle information on these distributions was extracted mostly from their moments computed in Lattice QCD. Recently, breakthrough ideas changed the landscape and several approaches were proposed to access the distributions themselves on the lattice. In this paper, we review in considerable detail approaches directly related to partonic distributions. We highlight a recent idea proposed by X. Ji on extracting quasidistributions that spawned renewed interest in the whole field and sparked the largest amount of numerical studies within Lattice QCD. We discuss theoretical and practical developments, including challenges that had to be overcome, with some yet to be handled. We also review numerical results, including a discussion based on evolving understanding of the underlying concepts and the theoretical and practical progress. Particular attention is given to important aspects that validated the quasidistribution approach, such as renormalization, matching to light-cone distributions, and lattice techniques. In addition to a thorough discussion of quasidistributions, we consider other approaches: hadronic tensor, auxiliary quark methods, pseudodistributions, OPE without OPE, and good lattice cross-sections. In the last part of the paper, we provide a summary and prospects of the field, with emphasis on the necessary conditions to obtain results with controlled uncertainties. |
| format | Article |
| id | doaj-art-31417ce2c53140108f417a3ce5f9b847 |
| institution | Kabale University |
| issn | 1687-7357 1687-7365 |
| language | English |
| publishDate | 2019-01-01 |
| publisher | Wiley |
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| series | Advances in High Energy Physics |
| spelling | doaj-art-31417ce2c53140108f417a3ce5f9b8472025-02-03T00:59:05ZengWileyAdvances in High Energy Physics1687-73571687-73652019-01-01201910.1155/2019/30369043036904A Guide to Light-Cone PDFs from Lattice QCD: An Overview of Approaches, Techniques, and ResultsKrzysztof Cichy0Martha Constantinou1Faculty of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, PolandDepartment of Physics, Temple University, Philadelphia, PA 19122 - 1801, USAWithin the theory of Quantum Chromodynamics (QCD), the rich structure of hadrons can be quantitatively characterized, among others, using a basis of universal nonperturbative functions: parton distribution functions (PDFs), generalized parton distributions (GPDs), transverse momentum dependent parton distributions (TMDs), and distribution amplitudes (DAs). For more than half a century, there has been a joint experimental and theoretical effort to obtain these partonic functions. However, the complexity of the strong interactions has placed severe limitations, and first-principle information on these distributions was extracted mostly from their moments computed in Lattice QCD. Recently, breakthrough ideas changed the landscape and several approaches were proposed to access the distributions themselves on the lattice. In this paper, we review in considerable detail approaches directly related to partonic distributions. We highlight a recent idea proposed by X. Ji on extracting quasidistributions that spawned renewed interest in the whole field and sparked the largest amount of numerical studies within Lattice QCD. We discuss theoretical and practical developments, including challenges that had to be overcome, with some yet to be handled. We also review numerical results, including a discussion based on evolving understanding of the underlying concepts and the theoretical and practical progress. Particular attention is given to important aspects that validated the quasidistribution approach, such as renormalization, matching to light-cone distributions, and lattice techniques. In addition to a thorough discussion of quasidistributions, we consider other approaches: hadronic tensor, auxiliary quark methods, pseudodistributions, OPE without OPE, and good lattice cross-sections. In the last part of the paper, we provide a summary and prospects of the field, with emphasis on the necessary conditions to obtain results with controlled uncertainties.http://dx.doi.org/10.1155/2019/3036904 |
| spellingShingle | Krzysztof Cichy Martha Constantinou A Guide to Light-Cone PDFs from Lattice QCD: An Overview of Approaches, Techniques, and Results Advances in High Energy Physics |
| title | A Guide to Light-Cone PDFs from Lattice QCD: An Overview of Approaches, Techniques, and Results |
| title_full | A Guide to Light-Cone PDFs from Lattice QCD: An Overview of Approaches, Techniques, and Results |
| title_fullStr | A Guide to Light-Cone PDFs from Lattice QCD: An Overview of Approaches, Techniques, and Results |
| title_full_unstemmed | A Guide to Light-Cone PDFs from Lattice QCD: An Overview of Approaches, Techniques, and Results |
| title_short | A Guide to Light-Cone PDFs from Lattice QCD: An Overview of Approaches, Techniques, and Results |
| title_sort | guide to light cone pdfs from lattice qcd an overview of approaches techniques and results |
| url | http://dx.doi.org/10.1155/2019/3036904 |
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