The N to Delta electromagnetic transition form factors from Lattice QCD

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The magnetic dipole, the electric quadrupole and the Coulomb quadrupole amplitudes for the transition \gamma N\to \Delta are calculated in quenched lattice QCD at \beta=6.0 with Wilson fermions. Using a new method combining an optimal combination of interpolating fields for the $\Delta$ and an overc...

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Autores principales: Alexandrou, C., de Forcrand, Ph., Neff, H., Negele, John W., Schroers, W., Tsapalis, A.
Lenguaje:eng
Publicado: 2004
Materias:
Particle Physics - Lattice
Acceso en línea:https://dx.doi.org/10.1103/PhysRevLett.94.021601
http://cds.cern.ch/record/793902
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author Alexandrou, C.
de Forcrand, Ph.
Neff, H.
Negele, John W.
Schroers, W.
Tsapalis, A.
author_facet Alexandrou, C.
de Forcrand, Ph.
Neff, H.
Negele, John W.
Schroers, W.
Tsapalis, A.
author_sort Alexandrou, C.
collection CERN
description The magnetic dipole, the electric quadrupole and the Coulomb quadrupole amplitudes for the transition \gamma N\to \Delta are calculated in quenched lattice QCD at \beta=6.0 with Wilson fermions. Using a new method combining an optimal combination of interpolating fields for the $\Delta$ and an overconstrained analysis, we obtain statistically accurate results for the dipole form factor and for the ratios of the electric and Coulomb quadrupole amplitudes to the magnetic dipole amplitude, R_{EM} and R_{SM}, up to momentum transfer squared 1.5 GeV^2. We show for the first time using lattice QCD that both R_{EM} and R_{SM} are non-zero and negative, in qualitative agreement with experiment and indicating the presence of deformation in the N- Delta system.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2004
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spelling cern-7939022023-03-14T19:52:46Zdoi:10.1103/PhysRevLett.94.021601http://cds.cern.ch/record/793902engAlexandrou, C.de Forcrand, Ph.Neff, H.Negele, John W.Schroers, W.Tsapalis, A.The N to Delta electromagnetic transition form factors from Lattice QCDParticle Physics - LatticeThe magnetic dipole, the electric quadrupole and the Coulomb quadrupole amplitudes for the transition \gamma N\to \Delta are calculated in quenched lattice QCD at \beta=6.0 with Wilson fermions. Using a new method combining an optimal combination of interpolating fields for the $\Delta$ and an overconstrained analysis, we obtain statistically accurate results for the dipole form factor and for the ratios of the electric and Coulomb quadrupole amplitudes to the magnetic dipole amplitude, R_{EM} and R_{SM}, up to momentum transfer squared 1.5 GeV^2. We show for the first time using lattice QCD that both R_{EM} and R_{SM} are non-zero and negative, in qualitative agreement with experiment and indicating the presence of deformation in the N- Delta system.The magnetic dipole, the electric quadrupole and the Coulomb quadrupole amplitudes for the transition \gamma N\to \Delta are calculated in quenched lattice QCD at \beta=6.0 with Wilson fermions. Using a new method combining an optimal combination of interpolating fields for the $\Delta$ and an overconstrained analysis, we obtain statistically accurate results for the dipole form factor and for the ratios of the electric and Coulomb quadrupole amplitudes to the magnetic dipole amplitude, R_{EM} and R_{SM}, up to momentum transfer squared 1.5 GeV^2. We show for the first time using lattice QCD that both R_{EM} and R_{SM} are non-zero and negative, in qualitative agreement with experiment and indicating the presence of deformation in the N- Delta system.hep-lat/0409122oai:cds.cern.ch:7939022004-09-19
spellingShingle Particle Physics - Lattice
Alexandrou, C.
de Forcrand, Ph.
Neff, H.
Negele, John W.
Schroers, W.
Tsapalis, A.
The N to Delta electromagnetic transition form factors from Lattice QCD
title The N to Delta electromagnetic transition form factors from Lattice QCD
title_full The N to Delta electromagnetic transition form factors from Lattice QCD
title_fullStr The N to Delta electromagnetic transition form factors from Lattice QCD
title_full_unstemmed The N to Delta electromagnetic transition form factors from Lattice QCD
title_short The N to Delta electromagnetic transition form factors from Lattice QCD
title_sort n to delta electromagnetic transition form factors from lattice qcd
topic Particle Physics - Lattice
url https://dx.doi.org/10.1103/PhysRevLett.94.021601
http://cds.cern.ch/record/793902
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