Sea quark contributions to the electric polarizability of hadrons

Walter Freeman; Andrei Alexandru; Mike Lujan; Frank X. Lee

doi:10.1103/PhysRevD.90.054507

Sea quark contributions to the electric polarizability of hadrons

Walter Freeman, Andrei Alexandru, Mike Lujan, Frank X. Lee

Research output: Contribution to journal › Article › peer-review

29 Scopus citations

Abstract

We present a lattice QCD calculation of the polarizability of the neutron and other neutral hadrons that includes the effects of the background field on the sea quarks. This is done by perturbatively reweighting the charges of the sea quarks to couple them to the background field. The main challenge in such a calculation is stochastic estimation of the weight factors, and we discuss the difficulties in this estimation. Here we use an extremely aggressive dilution scheme to reduce the stochastic noise to a manageable level. The pion mass in our calculation is 300 MeV and the lattice size is 3 fm. For the neutron, we find that αE=2.70(55)×10-4fm3, which is the most precise lattice QCD determination of the polarizability to date that includes sea effects.

Original language	English (US)
Article number	054507
Journal	Physical Review D - Particles, Fields, Gravitation and Cosmology
Volume	90
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevD.90.054507
State	Published - Sep 23 2014
Externally published	Yes

ASJC Scopus subject areas

Nuclear and High Energy Physics
Physics and Astronomy (miscellaneous)

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10.1103/PhysRevD.90.054507

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title = "Sea quark contributions to the electric polarizability of hadrons",

abstract = "We present a lattice QCD calculation of the polarizability of the neutron and other neutral hadrons that includes the effects of the background field on the sea quarks. This is done by perturbatively reweighting the charges of the sea quarks to couple them to the background field. The main challenge in such a calculation is stochastic estimation of the weight factors, and we discuss the difficulties in this estimation. Here we use an extremely aggressive dilution scheme to reduce the stochastic noise to a manageable level. The pion mass in our calculation is 300 MeV and the lattice size is 3 fm. For the neutron, we find that αE=2.70(55)×10-4fm3, which is the most precise lattice QCD determination of the polarizability to date that includes sea effects.",

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AU - Freeman, Walter

AU - Alexandru, Andrei

AU - Lujan, Mike

AU - Lee, Frank X.

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N2 - We present a lattice QCD calculation of the polarizability of the neutron and other neutral hadrons that includes the effects of the background field on the sea quarks. This is done by perturbatively reweighting the charges of the sea quarks to couple them to the background field. The main challenge in such a calculation is stochastic estimation of the weight factors, and we discuss the difficulties in this estimation. Here we use an extremely aggressive dilution scheme to reduce the stochastic noise to a manageable level. The pion mass in our calculation is 300 MeV and the lattice size is 3 fm. For the neutron, we find that αE=2.70(55)×10-4fm3, which is the most precise lattice QCD determination of the polarizability to date that includes sea effects.

AB - We present a lattice QCD calculation of the polarizability of the neutron and other neutral hadrons that includes the effects of the background field on the sea quarks. This is done by perturbatively reweighting the charges of the sea quarks to couple them to the background field. The main challenge in such a calculation is stochastic estimation of the weight factors, and we discuss the difficulties in this estimation. Here we use an extremely aggressive dilution scheme to reduce the stochastic noise to a manageable level. The pion mass in our calculation is 300 MeV and the lattice size is 3 fm. For the neutron, we find that αE=2.70(55)×10-4fm3, which is the most precise lattice QCD determination of the polarizability to date that includes sea effects.

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Sea quark contributions to the electric polarizability of hadrons

Abstract

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