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Seminar
NUMBER P20003
AUTHOR Leem, Jaehoon
TITLE Improvement of heavy-heavy and heavy-light currents with the Oktay-Kronfeld action
ARCHIVE Hep-lat/2001.05590
FILE  
JOURNAL PHYSICAL REVIEW D, 2022
ABSTRACT The Cabibbo-Kobayashi-Maskawa matrix elements 1Vcb1 and 1Vub1 can be obtained by combining data from the experiments with lattice QCD results for the semileptonic form factors for the B over bar -> D*e nu over bar and B over bar -> pi e nu over bar decays. It is highly desirable to use the Oktay-Kronfeld (OK) action for the form factor calculation on the lattice, since the OK action is designed to reduce the heavy quark discretization error down to the O(a4?4) similar or equal to O(?4=(2mQ)4) level in the power counting rules of the heavy quark effective theory (HQET). Here, we present a matching calculation to improve heavy-heavy and heavy-light currents up to the lambda 3 order in HQET, the same level of improvement as the OK action. Our final results for the improved currents are being used in a lattice QCD calculation of the semileptonic form factors for the
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