期刊
PHYSICAL REVIEW LETTERS
卷 103, 期 8, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.103.082003
关键词
-
资金
- Helmholtz Association [VH-VI-231]
- DFG
- EU [227431]
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.
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