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 evaluated in lattice QCD. Unquenching effects are studied using two dynamical Wilson fermions. The dipole transition form factor is accurately determined at several values o...

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Detalles Bibliográficos
Autores principales: Alexandrou, C, De Forcrand, Philippe, Lippert, T, Neff, H, Negele, J W, Schilling, K, Tsapalis, A
Lenguaje:eng
Publicado: 2003
Materias:
Particle Physics - Lattice
Acceso en línea:http://cds.cern.ch/record/628247
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author Alexandrou, C
De Forcrand, Philippe
Lippert, T
Neff, H
Negele, J W
Schilling, K
Tsapalis, A
author_facet Alexandrou, C
De Forcrand, Philippe
Lippert, T
Neff, H
Negele, J W
Schilling, K
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 evaluated in lattice QCD. Unquenching effects are studied using two dynamical Wilson fermions. The dipole transition form factor is accurately determined at several values of momentum transfer. The electric quadrupole amplitude is found to be non-zero yielding a negative value for the ratio,$ R_{EM}$, of electric quadrupole to magnetic dipole amplitudes given in the chiral limit at three values of momenta transfer.
id cern-628247
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2003
record_format invenio
spelling cern-6282472019-09-30T06:29:59Zhttp://cds.cern.ch/record/628247engAlexandrou, CDe Forcrand, PhilippeLippert, TNeff, HNegele, J WSchilling, KTsapalis, AN 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 evaluated in lattice QCD. Unquenching effects are studied using two dynamical Wilson fermions. The dipole transition form factor is accurately determined at several values of momentum transfer. The electric quadrupole amplitude is found to be non-zero yielding a negative value for the ratio,$ R_{EM}$, of electric quadrupole to magnetic dipole amplitudes given in the chiral limit at three values of momenta transfer.hep-lat/0307018oai:cds.cern.ch:6282472003-07-10
spellingShingle Particle Physics - Lattice
Alexandrou, C
De Forcrand, Philippe
Lippert, T
Neff, H
Negele, J W
Schilling, K
Tsapalis, A
N to Delta electromagnetic transition form factors from Lattice QCD
title N to Delta electromagnetic transition form factors from Lattice QCD
title_full N to Delta electromagnetic transition form factors from Lattice QCD
title_fullStr N to Delta electromagnetic transition form factors from Lattice QCD
title_full_unstemmed N to Delta electromagnetic transition form factors from Lattice QCD
title_short 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 http://cds.cern.ch/record/628247
work_keys_str_mv AT alexandrouc ntodeltaelectromagnetictransitionformfactorsfromlatticeqcd
AT deforcrandphilippe ntodeltaelectromagnetictransitionformfactorsfromlatticeqcd
AT lippertt ntodeltaelectromagnetictransitionformfactorsfromlatticeqcd
AT neffh ntodeltaelectromagnetictransitionformfactorsfromlatticeqcd
AT negelejw ntodeltaelectromagnetictransitionformfactorsfromlatticeqcd
AT schillingk ntodeltaelectromagnetictransitionformfactorsfromlatticeqcd
AT tsapalisa ntodeltaelectromagnetictransitionformfactorsfromlatticeqcd

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