%0 Journal Article %1 Guo2009Extraction %A Guo, Feng-Kun %A Hanhart, Christoph %A Ulf-G, %D 2009 %K pheno, quarkmass %T On the extraction of the light quark mass ratio from the decays psi' &\#45;&\#45;> J/psi pi^0 (eta) %U http://arxiv.org/abs/0907.0521 %X 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.

@article{Guo2009Extraction, abstract = {{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.}}, added-at = {2019-02-23T22:09:48.000+0100}, archiveprefix = {arXiv}, author = {Guo, Feng-Kun and Hanhart, Christoph and Ulf-G}, biburl = {https://www.bibsonomy.org/bibtex/274bef541a57e02d06e9971f725815e0d/cmcneile}, citeulike-article-id = {5073821}, citeulike-linkout-0 = {http://arxiv.org/abs/0907.0521}, citeulike-linkout-1 = {http://arxiv.org/pdf/0907.0521}, day = 3, eprint = {0907.0521}, interhash = {f1bbdd1badb4850fbc058ac834f571d5}, intrahash = {74bef541a57e02d06e9971f725815e0d}, keywords = {pheno, quarkmass}, month = jul, posted-at = {2009-07-06 11:27:07}, priority = {2}, timestamp = {2019-02-23T22:15:27.000+0100}, title = {{On the extraction of the light quark mass ratio from the decays psi' \&\#45;\&\#45;\> J/psi pi^0 (eta)}}, url = {http://arxiv.org/abs/0907.0521}, year = 2009 }