¦Vub| and constraints on the leading-twist pion distribution amplitude from B → π lv

被引：56

作者：

Ball, P

Zwicky, R

机构：

[1] Univ Durham, Dept Phys, IPPP, Durham DH1 3LE, England

[2] Univ Minnesota, William I Fine Theoret Phys Inst, Minneapolis, MN 55455 USA

来源：

PHYSICS LETTERS B | 2005年 / 625卷 / 3-4期

关键词：

D O I：

10.1016/j.physletb.2005.08.070

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Using new experimental data on the leptonic mass spectrum of B -> pi lv, we simultaneously determine vertical bar V-ub vertical bar and constrain a(2)(pi) and a(4)(pi), the first two Gegenbauer moments of the pion's leading-twist distribution amplitude. We find vertical bar Vub vertical bar = (3.2 +/- 0.1 +/- 0.1 +/- 0.3) x 10(-3), where the first error is experimental, the second comes from the shape of the form factor in q(2) and the third is a 8% uncertainty from the normalisation of the form factor. We also find a(2)(pi) (1 GeV) = 0. 19 +/- 0. 19 and a(4)(pi) (1 GeV) >= -0.07. (c) 2005 Published by Elsevier B.V.

引用

页码：225 / 233

页数：9

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