Several quantities relevant to phenomenological studies of B0-B0bar mixing are computed on the lattice. Our main results are f(Bd) root(B) over cap (Bd) = 206(28) (14)(-00)(+31) MeV, xi = f(Bd) root(B) over capB(x)/f(Bd) root(B) over cap (Bd) = 1.16(7). We also obtain the related quantities f(Bs) root(B) over cap (Bs) - 237(18) (10)(-00)(+34) MeV, f(Bd) = 174(22)(-0-0-00)(+7+5+26) MeV, f(Bs) = 204(15)(-0-0-00)(+7+4+31) MeV, f(Bs)/f(Bd) = 1.17(4)(-1)(+0), f(Bd)/f(Ds) = 0.74(5). After combining our results with the experimental world average Deltam(d)((exp)), we predict Deltam(s) = 15.8(2.1)(3.3) ps(-1). We have also computed the relevant parameters for D0-D0bar mixing which may be useful in some extensions of the Standard Model. All the quantities were obtained from a quenched simulation with a non-perturbatively improved Clover action at beta = 6.2, corresponding to a lattice spacing a(-1) = 2.7(1) GeV, on a sample of 200 gauge-field configurations. A discussion of the main systematic errors is also presented. The quenching errors are not included in the systematic error estimates.
Becirevic, D., Meloni, D., Retico, A., Gimenez, V., Giusti, L., Lubicz, V., et al. (2001). B-0-(B)over-bar(0) mixing and decay constants with the non-perturbatively improved action. NUCLEAR PHYSICS. B, 618(1-2), 241-258 [10.1016/S0550-3213(01)00482-5].
B-0-(B)over-bar(0) mixing and decay constants with the non-perturbatively improved action
MELONI, DAVIDE;LUBICZ, Vittorio;
2001-01-01
Abstract
Several quantities relevant to phenomenological studies of B0-B0bar mixing are computed on the lattice. Our main results are f(Bd) root(B) over cap (Bd) = 206(28) (14)(-00)(+31) MeV, xi = f(Bd) root(B) over capB(x)/f(Bd) root(B) over cap (Bd) = 1.16(7). We also obtain the related quantities f(Bs) root(B) over cap (Bs) - 237(18) (10)(-00)(+34) MeV, f(Bd) = 174(22)(-0-0-00)(+7+5+26) MeV, f(Bs) = 204(15)(-0-0-00)(+7+4+31) MeV, f(Bs)/f(Bd) = 1.17(4)(-1)(+0), f(Bd)/f(Ds) = 0.74(5). After combining our results with the experimental world average Deltam(d)((exp)), we predict Deltam(s) = 15.8(2.1)(3.3) ps(-1). We have also computed the relevant parameters for D0-D0bar mixing which may be useful in some extensions of the Standard Model. All the quantities were obtained from a quenched simulation with a non-perturbatively improved Clover action at beta = 6.2, corresponding to a lattice spacing a(-1) = 2.7(1) GeV, on a sample of 200 gauge-field configurations. A discussion of the main systematic errors is also presented. The quenching errors are not included in the systematic error estimates.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
