Magnetic structure of light nuclei from lattice QCD

Lattice QCD with background magnetic fields is used to calculate the magnetic moments and magnetic polarizabilities of the nucleons and of light nuclei with A [< or =] 4, along with the cross section for the M1 transition np [rarr] d[gamma], at the flavor SU(3)-symmetric point where the pion mass...

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Bibliographic Details
Published in:Physical review. D, Particles, fields, gravitation, and cosmology Particles, fields, gravitation, and cosmology, 2015-12, Vol.92 (11), Article 114502
Main Authors: Chang, Emmanuel, Detmold, William, Orginos, Kostas, Parreño, Assumpta, Savage, Martin J., Tiburzi, Brian C., Beane, Silas R.
Format: Article
Language:English
Subjects:
Cross sections
Lattices
Magnetic fields
Neural networks
NUCLEAR PHYSICS AND RADIATION PHYSICS
Nuclear reactor components
Nuclei
Nucleons
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Quantum chromodynamics
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Summary:Lattice QCD with background magnetic fields is used to calculate the magnetic moments and magnetic polarizabilities of the nucleons and of light nuclei with A [< or =] 4, along with the cross section for the M1 transition np [rarr] d[gamma], at the flavor SU(3)-symmetric point where the pion mass is m[subpi] ~ 806 MeV. These magnetic properties are extracted from nucleon and nuclear energies in six uniform magnetic fields of varying strengths. For the charged states, the extraction of the polarizability requires careful treatment of Landau levels, which enter non-trivially in the method that is employed. Mixing between the j[subz] = 0 deuteron state and the spin-singlet rip state induced by the background magnetic field is used to extract the short-distance two-nucleon counter-term, L[sub 1], of the pionless effective theory for NN systems that dictates the cross section for the np [rarr] d[gamma] process near threshold.
ISSN:1550-7998
1550-2368
DOI:10.1103/PhysRevD.92.114502