Extraction of the Light Quark Mass Ratio from the Decays ψ′→J/ψπ0(η)

被引：66

作者：

Guo, Feng-Kun ^{[1
,2
]}

Hanhart, Christoph ^{[1
,2
,3
]}

Meissner, Ulf-G. ^{[1
,2
,3
,4
,5
]}

机构：

[1] Forschungszentrum Julich, Inst Kernphys, D-52425 Julich, Germany

[2] Forschungszentrum Julich, Julich Ctr Hadron Phys, D-52425 Julich, Germany

[3] Forschungszentrum Julich, Inst Adv Simulat, D-52425 Julich, Germany

[4] Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany

[5] Univ Bonn, Bethe Ctr Theoret Phys, D-53115 Bonn, Germany

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 103卷 / 08期

关键词：

HADRONIC TRANSITIONS; SYMMETRY;

D O I：

10.1103/PhysRevLett.103.082003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Light quark masses are important fundamental parameters of the standard model. The decays psi(')-> J/Sigma pi(0)(eta) were widely used in determining the light quark mass ratio m(u)/m(d). However, there is a large discrepancy between the resulting value of m(u)/m(d) and the one determined from the light pseudoscalar meson masses. Using the technique of nonrelativistic effective field theory, we show that intermediate charmed meson loops lead to a sizable contribution to the decays and hence make the psi(')-> J/psi pi(0)(eta) decays not suitable for a precise extraction of the light quark mass ratio.

引用

页数：4

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