Several quantities relevant to phenomenological studies of the mixing of neutral B mesons are computed on the lattice. Our main results are: f_{Bd} sqrt(B_{Bd})=206(28)(7) MeV, f_{Bs} sqrt(B_{Bs})/f_{Bd}sqrt(B_{Bd})=1.16(7). We also obtain the related quantities f_{Bs}sqrt(B{Bs})=237(18)(8) MeV, f_{Bd}= 174(22)(+7-0)(-4-0) MeV, f_{Bs}= 204(15)(+7-0)(+3-0) MeV, f_{Bs}/f_{Bd}=1.17(4)(+0-1), f_{Bd}/f_{Ds}=0.74(5). After combining our results with the experimental world average (Delta m_d), we predict (Delta m_s)=15.8(2.1)(3.3) ps^{-1}. We have also computed the relevant parameters for mixing of neutral D mesons 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 1/a=2.7(1) GeV, on a sample of 200 gauge-field configurations. A discussion of the main systematic errors is also presented

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

GIUSTI, LEONARDO;
2001

Abstract

Several quantities relevant to phenomenological studies of the mixing of neutral B mesons are computed on the lattice. Our main results are: f_{Bd} sqrt(B_{Bd})=206(28)(7) MeV, f_{Bs} sqrt(B_{Bs})/f_{Bd}sqrt(B_{Bd})=1.16(7). We also obtain the related quantities f_{Bs}sqrt(B{Bs})=237(18)(8) MeV, f_{Bd}= 174(22)(+7-0)(-4-0) MeV, f_{Bs}= 204(15)(+7-0)(+3-0) MeV, f_{Bs}/f_{Bd}=1.17(4)(+0-1), f_{Bd}/f_{Ds}=0.74(5). After combining our results with the experimental world average (Delta m_d), we predict (Delta m_s)=15.8(2.1)(3.3) ps^{-1}. We have also computed the relevant parameters for mixing of neutral D mesons 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 1/a=2.7(1) GeV, on a sample of 200 gauge-field configurations. A discussion of the main systematic errors is also presented
Si
Articolo in rivista - Articolo scientifico
Scientifica
B physics, gauge theory, lattice
English
241
258
18
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].
Becirevic, D; Meloni, D; Retico, A; Gimenez, V; Giusti, L; Lubicz, V; Martinelli, G
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10281/24740
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