Two-loop calculation of the anomalous dimension of the axial current with static heavy quarks
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Two-loop calculation of the anomalous dimension of the axial current with static heavy quarks

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Two-loop calculation of the anomalous dimension of the axial current with static heavy quarks

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dc.contributor.author Giménez Gómez, Vicente
dc.date.accessioned 2014-09-25T11:03:30Z
dc.date.available 2014-09-25T11:03:30Z
dc.date.issued 1992
dc.identifier.uri http://hdl.handle.net/10550/38966
dc.description.abstract A method to perform two-loop calculations in Eichten's effective field theory for heavy quarks is developed. The anomalous dimension of the axial current for static heavy quarks is calculated at two loops. For N = 3, we get gamma(A)(2) = - 1/36[127/2 + 28-xi(2) - 5N(f)]. This result is very important to understand completely the physical significance of the lattice measurement of the decay constant of the B meson. The two-loop correction generated by gamma(A)(2) turns out to be small, less than 1% for four quark flavours, so that the value of the decay constant of the B meson does not need in practice renormalization group improvement. As extra results, the self-energy renormalization constant at two-loop level for a heavy static quark and that for the coupling of a heavy quark to a gluon are obtained.
dc.language.iso eng
dc.relation.ispartof Nuclear Physics B, 1992, vol. 375, num. 3, p. 582-624
dc.rights.uri info:eu-repo/semantics/openAccess
dc.source Giménez Gómez, Vicente 1992 Two-loop calculation of the anomalous dimension of the axial current with static heavy quarks Nuclear Physics B 375 3 582 624
dc.subject Física
dc.title Two-loop calculation of the anomalous dimension of the axial current with static heavy quarks
dc.type info:eu-repo/semantics/article
dc.date.updated 2014-09-25T11:03:31Z
dc.identifier.doi http://dx.doi.org/10.1016/0550-3213(92)90112-O
dc.identifier.idgrec 099546

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