Extraction of the light quark mass ratio from the decays psi' --> J/psi pi^0 (eta)

Details Extraction of the light quark mass ratio from the decays psi' --> J/psi pi^0 (eta) Extraction of the light quark mass ratio from the decays psi' --> J/psi pi^0 (eta)

2009-07-03

arxiv.org/abs/0907.0521v3

Phys.Rev.Lett.103:082003,2009; Erratum-ibid.104:109901,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 1 figure. Numerical results corrected, conclusions unchanged

Scientific paper

10.1103/PhysRevLett.103.082003

Light quark masses are important fundamental parameters of the Standard Model. The decays psi'-->J/psi 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 non-relativistic effective field theory, we show that intermediate charmed meson loops lead to a sizeable 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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