Nonperturbatively improved heavy-light mesons: Masses and decay constants

被引：121
作者：
Becirevic, D
Boucaud, P
Leroy, JP
Lubicz, V
Martinelli, G
Mescia, F
Rapuano, F
机构：
[1] Univ Paris 11, Phys Theor & Hautes Energies Lab, F-91405 Orsay, France
[2] Univ Rome Tre, Dipartimento Fis, I-00146 Rome, Italy
[3] Ist Nazl Fis Nucl, Sez Roma Tre, I-00146 Rome, Italy
[4] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy
[5] Ist Nazl Fis Nucl, Sez Roma, I-00185 Rome, Italy
来源：
PHYSICAL REVIEW D | 1999年 / 60卷 / 07期
关键词：
D O I：
10.1103/PhysRevD.60.074501
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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. [S0556-2821(99)00317-3].
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页数：14
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