0000000000698978
AUTHOR
Juan Reyes Gámez
Width difference in the B-s(0)-(B)over-bar-(0)(s) system from lattice HQET
We present recent results for the prediction of the B-s(0)-(B) over bar (0)(s) lifetime difference from lattice Heavy Quark Effective Theory simulations. In order to get a next-to-leading order result we have calculated the matching between QCD and HQET and the two loop anomalous dimension in the HQET for all the DeltaB = 2 operators, in particular for the operators which enter in the width difference. me obtain far the B-s(0)-(B) over bar (0)(s) lifetime difference, Delta GammaB(s)/GammaB(s) = (5.1 +/- 1.9 +/- 1.7) x 10(-2).
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
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 De…
B(d) - anti-B(d) mixing and the B(d) ---> J / psi K(s) asymmetry in general SUSY models
We present a next-to-leading order determination of the gluino-mediated SUSY contributions to B-d-(B) over bard mixing and to the CP asymmetry a(J)/psiK(s) in the framework of the mass-insertion approximation. Using hadronic matrix elements recently computed on the lattice, we obtain improved constraints on the squark-mass splittings.