Octet baryon magnetic moments from lattice QCD: Approaching experiment from a three-flavor symmetric point
Abstract
We used lattice QCD calculations with background magnetic fields to determine the magnetic moments of the octet baryons. Computations are performed at the physical value of the strange quark mass, and two values of the light quark mass, one corresponding to the SU(3) flavor-symmetric point, where the pion mass is mπ ~ 800 MeV, and the other corresponding to a pion mass mπ ~ 450 MeV. The moments are found to exhibit only mild pion-mass dependence when expressed in terms of appropriately chosen magneton units---the natural baryon magneton. This suggests that simple extrapolations can be used to determine magnetic moments at the physical point, and extrapolated results are found to agree with experiment within uncertainties. A curious pattern is revealed among the anomalous baryon magnetic moments which is linked to the constituent quark model, however, careful scrutiny exposes additional features. Relations expected to hold in the large-Nc limit of QCD are studied; and, in one case, the quark model prediction is significantly closer to the extracted values than the large-Nc prediction. The magnetically coupled Λ-Σ0 system is treated in detail at the SU(3)F point, with the lattice QCD results comparing favorably with predictions based on SU(3)F symmetry. Our analysis enablesmore »
- Authors:
-
- Univ. of Barcelona (Spain). Inst. of Cosmo Sciences
- Univ. of Washington, Seattle, WA (United States). Inst. for Nuclear Theory; Univ. of California, Santa Barbara, CA (United States). Inst. for Nuclear Theory
- Univ. of Washington, Seattle, WA (United States). Inst. for Nuclear Theory; Univ. of California, Santa Barbara, CA (United States). Kavli Inst. for Theoretical Physics; City College of New York, NY (United States). Dept. of Physics and University Center; Brookhaven National Lab. (BNL), Upton, NY (United States). RIKEN Research Center
- Justus Liebig Univ., Gieben (Germany); Univ. of Washington, Seattle, WA (United States). Dept. of Physics
- Univ. of Washington, Seattle, WA (United States). Inst. for Nuclear Theory
- Univ. of California, Santa Barbara, CA (United States). Inst. for Nuclear Theory; Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Center for Theoretical Physics
- College of William and Mary, Williamsburg, VA (United States). Dept. of Physics; Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Publication Date:
- Research Org.:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1374984
- Alternate Identifier(s):
- OSTI ID: 1366331
- Report Number(s):
- JLAB-THY-16-2334; DOE/OR/23177-3999; arXiv:1609.03985
Journal ID: ISSN 2470-0010; PRVDAQ
- Grant/Contract Number:
- NSF PHY11-25915; OCI-1053575; 0922770; PHY15-15738; AC02-05CH11231; SC00-10495; SC0011090; SC00-10337; FG02- 00ER41132; FG02-04ER41302; AC05-06OR23177; FG02-00ER41132; FIS2011-24154
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review D
- Additional Journal Information:
- Journal Volume: 95; Journal Issue: 11; Journal ID: ISSN 2470-0010
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Citation Formats
Parreño, Assumpta, Savage, Martin J., Tiburzi, Brian C., Wilhelm, Jonas, Chang, Emmanuel, Detmold, William, and Orginos, Kostas. Octet baryon magnetic moments from lattice QCD: Approaching experiment from a three-flavor symmetric point. United States: N. p., 2017.
Web. doi:10.1103/PhysRevD.95.114513.
Parreño, Assumpta, Savage, Martin J., Tiburzi, Brian C., Wilhelm, Jonas, Chang, Emmanuel, Detmold, William, & Orginos, Kostas. Octet baryon magnetic moments from lattice QCD: Approaching experiment from a three-flavor symmetric point. United States. https://doi.org/10.1103/PhysRevD.95.114513
Parreño, Assumpta, Savage, Martin J., Tiburzi, Brian C., Wilhelm, Jonas, Chang, Emmanuel, Detmold, William, and Orginos, Kostas. Fri .
"Octet baryon magnetic moments from lattice QCD: Approaching experiment from a three-flavor symmetric point". United States. https://doi.org/10.1103/PhysRevD.95.114513. https://www.osti.gov/servlets/purl/1374984.
@article{osti_1374984,
title = {Octet baryon magnetic moments from lattice QCD: Approaching experiment from a three-flavor symmetric point},
author = {Parreño, Assumpta and Savage, Martin J. and Tiburzi, Brian C. and Wilhelm, Jonas and Chang, Emmanuel and Detmold, William and Orginos, Kostas},
abstractNote = {We used lattice QCD calculations with background magnetic fields to determine the magnetic moments of the octet baryons. Computations are performed at the physical value of the strange quark mass, and two values of the light quark mass, one corresponding to the SU(3) flavor-symmetric point, where the pion mass is mπ ~ 800 MeV, and the other corresponding to a pion mass mπ ~ 450 MeV. The moments are found to exhibit only mild pion-mass dependence when expressed in terms of appropriately chosen magneton units---the natural baryon magneton. This suggests that simple extrapolations can be used to determine magnetic moments at the physical point, and extrapolated results are found to agree with experiment within uncertainties. A curious pattern is revealed among the anomalous baryon magnetic moments which is linked to the constituent quark model, however, careful scrutiny exposes additional features. Relations expected to hold in the large-Nc limit of QCD are studied; and, in one case, the quark model prediction is significantly closer to the extracted values than the large-Nc prediction. The magnetically coupled Λ-Σ0 system is treated in detail at the SU(3)F point, with the lattice QCD results comparing favorably with predictions based on SU(3)F symmetry. Our analysis enables the first extraction of the isovector transition magnetic polarizability. The possibility that large magnetic fields stabilize strange matter is explored, but such a scenario is found to be unlikely.},
doi = {10.1103/PhysRevD.95.114513},
journal = {Physical Review D},
number = 11,
volume = 95,
place = {United States},
year = {2017},
month = {6}
}
Web of Science
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