Up, down, and strange nucleon axial form factors from lattice QCD
We report a calculation of the nucleon axial form factors G[superscript q][superscript A](Q[superscript 2]) and G[superscript q][subscript P](Q[superscript 2]) for all three light quark flavors q ∈ {u,d,s} in the range 0 ≤ Q[superscript 2] ≲ 1.2 GeV[superscript 2] using lattice QCD. This work was d...
| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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American Physical Society
2017
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| Online Access: | http://hdl.handle.net/1721.1/110022 https://orcid.org/0000-0002-5713-0039 |
| _version_ | 1826213145723535360 |
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| author | Green, Jeremy Hasan, Nesreen Meinel, Stefan Engelhardt, Michael Krieg, Stefan Laeuchli, Jesse Orginos, Kostas Syritsyn, Sergey Pochinsky, Andrew Negele, John W. |
| author2 | Massachusetts Institute of Technology. Center for Theoretical Physics |
| author_facet | Massachusetts Institute of Technology. Center for Theoretical Physics Green, Jeremy Hasan, Nesreen Meinel, Stefan Engelhardt, Michael Krieg, Stefan Laeuchli, Jesse Orginos, Kostas Syritsyn, Sergey Pochinsky, Andrew Negele, John W. |
| author_sort | Green, Jeremy |
| collection | MIT |
| description | We report a calculation of the nucleon axial form factors G[superscript q][superscript A](Q[superscript 2]) and G[superscript q][subscript P](Q[superscript 2]) for all three light quark flavors q ∈ {u,d,s} in the range 0 ≤ Q[superscript 2] ≲ 1.2 GeV[superscript 2] using lattice QCD. This work was done using a single ensemble with pion mass 317 MeV and made use of the hierarchical probing technique to efficiently evaluate the required disconnected loops. We perform nonperturbative renormalization of the axial current, including a nonperturbative treatment of the mixing between light and strange currents due to the singlet-nonsinglet difference caused by the axial anomaly. The form factor shapes are fit using the model-independent z expansion. From G[superscript q][subscript A](Q[superscript 2]), we determine the quark contributions to the nucleon spin and axial radii. By extrapolating the isovector G[superscript u-d][subscript P](Q[superscript 2]), we obtain the induced pseudoscalar coupling relevant for ordinary muon capture and the pion-nucleon coupling constant. We find that the disconnected contributions to G[subscript P] form factors are large, and give an interpretation based on the dominant influence of the pseudoscalar poles in these form factors. |
| first_indexed | 2024-09-23T15:44:21Z |
| format | Article |
| id | mit-1721.1/110022 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T15:44:21Z |
| publishDate | 2017 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/1100222023-02-26T05:48:36Z Up, down, and strange nucleon axial form factors from lattice QCD Green, Jeremy Hasan, Nesreen Meinel, Stefan Engelhardt, Michael Krieg, Stefan Laeuchli, Jesse Orginos, Kostas Syritsyn, Sergey Pochinsky, Andrew Negele, John W. Massachusetts Institute of Technology. Center for Theoretical Physics Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Laboratory for Nuclear Science Negele, John W Pochinsky, Andrew We report a calculation of the nucleon axial form factors G[superscript q][superscript A](Q[superscript 2]) and G[superscript q][subscript P](Q[superscript 2]) for all three light quark flavors q ∈ {u,d,s} in the range 0 ≤ Q[superscript 2] ≲ 1.2 GeV[superscript 2] using lattice QCD. This work was done using a single ensemble with pion mass 317 MeV and made use of the hierarchical probing technique to efficiently evaluate the required disconnected loops. We perform nonperturbative renormalization of the axial current, including a nonperturbative treatment of the mixing between light and strange currents due to the singlet-nonsinglet difference caused by the axial anomaly. The form factor shapes are fit using the model-independent z expansion. From G[superscript q][subscript A](Q[superscript 2]), we determine the quark contributions to the nucleon spin and axial radii. By extrapolating the isovector G[superscript u-d][subscript P](Q[superscript 2]), we obtain the induced pseudoscalar coupling relevant for ordinary muon capture and the pion-nucleon coupling constant. We find that the disconnected contributions to G[subscript P] form factors are large, and give an interpretation based on the dominant influence of the pseudoscalar poles in these form factors. United States. Dept. of Energy. Office of Nuclear Physics (Grants DE–FG02–94ER40818) 2017-06-19T19:22:37Z 2017-06-19T19:22:37Z 2017-06 2017-03 2017-06-14T22:00:03Z Article http://purl.org/eprint/type/JournalArticle 2470-0010 2470-0029 http://hdl.handle.net/1721.1/110022 Green, Jeremy et al. “Up, Down, and Strange Nucleon Axial Form Factors from Lattice QCD.” Physical Review D 95.11 (2017): n. pag. © 2017 American Physical Society https://orcid.org/0000-0002-5713-0039 en http://dx.doi.org/10.1103/PhysRevD.95.114502 Physical Review D Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. American Physical Society application/pdf American Physical Society American Physical Society |
| spellingShingle | Green, Jeremy Hasan, Nesreen Meinel, Stefan Engelhardt, Michael Krieg, Stefan Laeuchli, Jesse Orginos, Kostas Syritsyn, Sergey Pochinsky, Andrew Negele, John W. Up, down, and strange nucleon axial form factors from lattice QCD |
| title | Up, down, and strange nucleon axial form factors from lattice QCD |
| title_full | Up, down, and strange nucleon axial form factors from lattice QCD |
| title_fullStr | Up, down, and strange nucleon axial form factors from lattice QCD |
| title_full_unstemmed | Up, down, and strange nucleon axial form factors from lattice QCD |
| title_short | Up, down, and strange nucleon axial form factors from lattice QCD |
| title_sort | up down and strange nucleon axial form factors from lattice qcd |
| url | http://hdl.handle.net/1721.1/110022 https://orcid.org/0000-0002-5713-0039 |
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