Calculation of the continuum-lattice HQET matching for the complete basis of four-fermion operators: reanalysis of the B-0-(B)over-bar(0) mixing
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Calculation of the continuum-lattice HQET matching for the complete basis of four-fermion operators: reanalysis of the B-0-(B)over-bar(0) mixing

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Calculation of the continuum-lattice HQET matching for the complete basis of four-fermion operators: reanalysis of the B-0-(B)over-bar(0) mixing

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dc.contributor.author Giménez Gómez, Vicente
dc.contributor.author Reyes Gámez, Juan
dc.date.accessioned 2014-09-26T10:46:19Z
dc.date.available 2014-09-26T10:46:19Z
dc.date.issued 1999
dc.identifier.uri http://hdl.handle.net/10550/39003
dc.description.abstract In this work, we find the expressions of continuum HQET four-fermion operators in terms of lattice operators in perturbation theory. To do so, we calculate the one-loop continuum-lattice HQET matching for the complete basis of Delta B = 2 and Delta B = 0 operators (excluding penguin diagrams), extending and completing previous studies. We have also corrected some errors in previous evaluations of the matching for the operator O-LL. Our results are relevant to the lattice computation of the values of unknown hadronic matrix elements which enter in many very important theoretical predictions in B-meson phenomenology: B-0-(B) over bar(0) mixing, tau(B) and tau(B), lifetimes, SUSY effects in Delta B = 2 transitions and the B-s width difference Delta Gamma(Bs). We have reanalyzed our lattice data for the B-B parameter of the B-0-(B) over bar(0) mixing on 600 lattices of size 24(3) x 40 at beta = 6.0 computed with the SW-Clover and HQET lattice actions. We have used the correct lattice-continuum matching factors and boosted perturbation theory with tadpole improved heavy-light operators to reduce the systematic error in the evaluation of the renormalization constants. Our best estimate of the renormalization scale independent B-parameter is (B) over cap(B) = 1.29 +/- 0.08 +/- 0.06, where the first error is statistical and the second is systematic coming from the uncertainty in the determination of the renormalization constants, Our result is in good agreement with previous results obtained by extrapolating Wilson data, As a byproduct, we also obtain the complete one-loop anomalous dimension matrix for four-fermion operators in the HQET.
dc.language.iso eng
dc.relation.ispartof Nuclear Physics B, 1999, vol. 545, num. 1-3, p. 576-606
dc.rights.uri info:eu-repo/semantics/openAccess
dc.source Giménez Gómez, Vicente Reyes, J. 1999 Calculation of the continuum-lattice HQET matching for the complete basis of four-fermion operators: reanalysis of the B-0-(B)over-bar(0) mixing Nuclear Physics B 545 1-3 576 606
dc.subject Física
dc.title Calculation of the continuum-lattice HQET matching for the complete basis of four-fermion operators: reanalysis of the B-0-(B)over-bar(0) mixing
dc.type info:eu-repo/semantics/article
dc.date.updated 2014-09-26T10:46:19Z
dc.identifier.doi http://dx.doi.org/10.1016/S0550-3213(98)00867-0
dc.identifier.idgrec 099565

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