HEAVY-QUARK EXPANSION FOR THE INCLUSIVE DECAY (B)OVER-BAR-]TAU(NU-OVER-BARX

被引：123

作者：

FALK, AF

LIGETI, Z

NEUBERT, M

NIR, Y

机构：

[1] JOHNS HOPKINS UNIV,DEPT PHYS & ASTRON,BALTIMORE,MD 21218

[2] WEIZMANN INST SCI,DEPT PARTICLE PHYS,IL-76100 REHOVOT,ISRAEL

[3] CERN,DIV THEORY,CH-1211 GENEVA 23,SWITZERLAND

来源：

PHYSICS LETTERS B | 1994年 / 326卷 / 1-2期

基金：

美国能源部;

关键词：

D O I：

10.1016/0370-2693(94)91206-8

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We calculate the differential decay rate for inclusive B --> taunuXBAR transitions to order 1/m(b)2 in the heavy quark expansion, for both polarized and unpolarized tau leptons. We show that using a systematic 1/m(b) expansion significantly reduces the theoretical uncertainties in the calculation. We obtain for the total branching ratio BR(BBAR --> taunuXBAR) = 2.30 +/- 0.25%, and for the tau polarization A(pol) = -0.706 +/- 0.006. From the experimental measurement of the branching ratio at LEP, we derive the upper bound lambda1 less-than-or-equal-to 0.8 GeV2 for one of the parameters of the heavy quark effective theory.

引用

页码：145 / 153

页数：9

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