Electric polarizability of hadrons

By simulating a uniform electric field on a lattice and measuring the change in the rest mass, we calculate the electric polarizability of neutral mesons and baryons using the methods of quenched lattice QCD. Specifically, we measure the electric polarizability coefficient from the quadratic response to the electric field for 10 particles: the vector mesons 0 and K 0 ; the octet baryons n, 0 , 0 , and 0 ; and the decuplet baryons 0 , 0 , and 0 . Independent calculations using two fermion actions were done for consistency and comparison purposes. One calculation uses Wilson fermions with a lattice spacing of a 0:10 fm. The other uses tadpole-improved Lüscher-Weisz gauge fields and clover quark action with a lattice spacing a 0:17 fm. Our results for neutron electric polarizability are compared to experiment.

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“…(11) of [1].) Compilations of experimental results for neutron electric polarizability have been given in [2,3].…”

Section: Introduction and Reviewmentioning

confidence: 99%

Electric polarizability of neutral hadrons from lattice QCD

et al. 2005

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“…Lattice four point function techniques have also been designed to extract neutral or charged particle electric polarizabilities [45] (chiral symmetry can sometimes be used to reduce the calculation to two point functions [46]), but these methods are more difficult to carry out on the lattice. Early results of the present study have been reported in [47]. tables 2…”

Section: Electric Polarizabilitiesmentioning

confidence: 62%

Selected results in hadron structure from lattice QCD

Lee

2006

Nuclear Physics B - Proceedings Supplements

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“…To be complete we note that by using background electric fields, electric polarizabilities [31,32] and the electric dipole moment of the nucleon [33] have been investigated. To apply a spatially constant background magnetic field aligned in the z-direction in a lattice simulation, one takes a SU(3) gauge-configuration and modifies the link fields by…”

Section: Lattice Qcd and Background Fieldsmentioning

confidence: 99%

Electroweak matrix elements in the two-nucleon sector from lattice QCD

Detmold¹,

Savage²

2004

Nuclear Physics A

107

136

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We demonstrate how to make rigorous predictions for electroweak matrix elements in nuclear systems directly from QCD. More precisely, we show how to determine the short-distance contributions to low-momentum transfer electroweak matrix elements in the two-nucleon sector from lattice QCD. In potential model descriptions of multi-nucleon systems, this is equivalent to uniquely determining the meson-exchange currents, while in the context of nuclear effective field theory, this translates into determining the coefficients of local, gauge-invariant, multi-nucleon-electroweak current operators. The energies of the lowest-lying states of two nucleons on a finite volume lattice with periodic boundary conditions in the presence of a background magnetic field are sufficient to determine the local four-nucleon operators that contribute to the deuteron magnetic moment and to the threshold cross-section of np → dγ. Similarly, the energy-levels of two nucleons immersed in a background isovector axial weak field can be used to determine the coefficient of the leading local four-nucleon operator contributing to the neutral-and charged-current break-up of the deuteron. This is required for the extraction of solar neutrino fluxes at SNO and future neutrino experiments.

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Electric polarizability of hadrons

Cited by 8 publications

References 12 publications

Electric polarizability of neutral hadrons from lattice QCD

Electric polarizability of neutral hadrons from lattice QCD

Selected results in hadron structure from lattice QCD

Electroweak matrix elements in the two-nucleon sector from lattice QCD

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