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- W1641949822 abstract "We show that the size of the hard gluonic contribution to the first moment of the proton’s spin‐dependent structure function g1 is entirely a matter of the convention used in defining the quark distributions. If the UV regulator for the spin‐dependent quark distributions respects the gauge invariance of Green’s functions (allows shifts of loop momenta) and respects the analyticity structure of the unregulated distributions, then the hard gluonic contribution to the first moment of g1 vanishes. This is the case, for example, in dimensional regularization. By relaxing the requirement that the regulator allow shifts of loop momenta, we are able to obtain a nonvanishing hard gluonic contribution to the first moment of g1. However, the first moments of the resulting quark distributions correspond to matrix elements that are either gauge variant or involve nonlocal operators and, hence, have no analogue in the standard operator‐product expansion." @default.
- W1641949822 created "2016-06-24" @default.
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- W1641949822 date "1991-01-01" @default.
- W1641949822 modified "2023-09-24" @default.
- W1641949822 title "Is there a hard gluonic contribution to the first moment of g1?" @default.
- W1641949822 doi "https://doi.org/10.1063/1.40493" @default.
- W1641949822 hasPublicationYear "1991" @default.
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