1996
DOI: 10.1016/0920-5632(96)00041-2
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New developments in lattice QCD: Calculation of flavor singlet nucleon matrix elements and hadron scattering lengths

Abstract: Recent developments in lattice QCD calculation of flavor singlet nucleon matrix elements are reviewed. Substantial sea quark contributions are found in the π-N σ term and the quark spin content of the nucleon such that the total magnitude including valence contributions is in reasonable agreement with experiments. Some problems with flavor non-singlet nucleon matrix elements are pointed out. Recent work on lattice QCD calculation of hadron scattering length is also discussed.

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Cited by 3 publications
(2 citation statements)
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“…This agreement is significantly improved from the valence quark model which predicts F S < 1 and D S = 0 and also those of the CI alone [40,41]. The latter yields F S = 0.91 (13) and D S = −0.28 (10) which are only half of the phenomenological values [40][41][42]. This again underscores the importance of the disconnected sea-quark contributions.…”
Section: Scalar Matrix Elements R S and D S /F Smentioning
confidence: 52%
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“…This agreement is significantly improved from the valence quark model which predicts F S < 1 and D S = 0 and also those of the CI alone [40,41]. The latter yields F S = 0.91 (13) and D S = −0.28 (10) which are only half of the phenomenological values [40][41][42]. This again underscores the importance of the disconnected sea-quark contributions.…”
Section: Scalar Matrix Elements R S and D S /F Smentioning
confidence: 52%
“…Unlike the case of the axial current matrix element, different flavours contribute differently from the DI of the scalar matrix element-s contributes less than u and d. As a result, the 3) breaking pattern of the octet baryon masses with either linear [40,41] or quadratic mass relations [42]. This agreement is significantly improved from the valence quark model which predicts F S < 1 and D S = 0 and also those of the CI alone [40,41]. The latter yields F S = 0.91 (13) and D S = −0.28 (10) which are only half of the phenomenological values [40][41][42].…”
Section: Scalar Matrix Elements R S and D S /F Smentioning
confidence: 99%