We present a study of the heavy-light spectrum and of the D- and B-meson decay constants. The results were obtained in the quenched approximation, by using the nonperturbatively improved clover lattice action at beta =6.2, with a sample of 100 configurations, on a 24(3)x64 lattice. After a careful analysis of the systematic errors present in the extraction of the physical results, by assuming quite conservative discretization errors, we find f(D)=231+/-12(-1)(+8) Mev, f(D) = 211 +/- 14(-12)(+2), MeV f(Ds)/f(D) = 1.10(2) f(Bs) = 204+/-16(-0)(+36) MeV, f(B)=179 +/-18(-9)(+34) MeV, f(Bs)/f(B) = 1.14(3)(-1)(+1). Our results, which have smaller discretization errors than many previous estimates at fixed value of the lattice spacing a, support a large value of f(B) in the quenched approximation.
Becirevic, D., Boucaud, P., Leroy, J.p., Lubicz, V., Martinelli, G., Mescia, F., et al. (1999). Nonperturbatively improved heavy-light mesons: Masses and decay constants. PHYSICAL REVIEW D, 60(7) [10.1103/PhysRevD.60.074501].
Nonperturbatively improved heavy-light mesons: Masses and decay constants
LUBICZ, Vittorio;
1999-01-01
Abstract
We present a study of the heavy-light spectrum and of the D- and B-meson decay constants. The results were obtained in the quenched approximation, by using the nonperturbatively improved clover lattice action at beta =6.2, with a sample of 100 configurations, on a 24(3)x64 lattice. After a careful analysis of the systematic errors present in the extraction of the physical results, by assuming quite conservative discretization errors, we find f(D)=231+/-12(-1)(+8) Mev, f(D) = 211 +/- 14(-12)(+2), MeV f(Ds)/f(D) = 1.10(2) f(Bs) = 204+/-16(-0)(+36) MeV, f(B)=179 +/-18(-9)(+34) MeV, f(Bs)/f(B) = 1.14(3)(-1)(+1). Our results, which have smaller discretization errors than many previous estimates at fixed value of the lattice spacing a, support a large value of f(B) in the quenched approximation.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
