QCD sum rule calculation for the tensor charge of the nucleon
- Center for Theoretical Physics, Laboratory for Nuclear Science and Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
The nucleon{close_quote}s tensor charges (isovector {ital g}{sup {ital v}}{sub {ital T}}={delta}{ital u}{minus}{delta}{ital d} and isoscalar {ital g}{sup {ital s}}{sub {ital T}}={delta}{ital u}+{delta}{ital d}) are calculated using the QCD sum rules in the presence of an external tensor field. In addition to the standard quark and gluon condensates, new condensates described by vacuum susceptibilities are induced by the external field. The latter contributions to {ital g}{sup {ital v}}{sub {ital T}} and {ital g}{sup {ital s}}{sub {ital T}} are estimated to be small. After deriving some simplifying formulas, a detailed sum rule analysis yields {ital g}{sup {ital v}}{sub {ital T}}=1.29{plus_minus}0.51 and {ital g}{sup {ital s}}{sub {ital T}}=1.37{plus_minus}0.55, or {delta}{ital u}=1.33{plus_minus}0.53 and {delta}{ital d}=0.04{plus_minus}0.02 at the scale of 1 GeV{sup 2}. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 401154
- Journal Information:
- Physical Review, D, Vol. 54, Issue 11; Other Information: PBD: Dec 1996
- Country of Publication:
- United States
- Language:
- English
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