%0 Generic %1 Masjuan2015Eta %A Masjuan, Pere %A Sanchez-Puertas, Pablo %D 2015 %K eta %T \$\eta\$ and \$\eta'\$ decays into lepton pairs %U http://arxiv.org/abs/1512.09292 %X In this work, we calculate the branching ratios for the \$\eta(\eta')\rightarrow\ell\ell\$ decays, where \$= e,\mu\$. These processes have tiny rates in the standard model due to spin flip, loop, and electromagnetic suppression, for what they could be sensitive to new physics effects. In order to provide a reliable input for the standard model, we use the machinery of Canterbury approximants to provide a systematic description for the underlying hadronic physics in a model-independent fashion. We carefully discuss the role of the resonant region and comment on the reliability of \$\chi\$PT calculations. Finally, we discuss the kind of new physics which would be relevant in these processes given the experimental discrepancies.

@misc{Masjuan2015Eta, abstract = {In this work, we calculate the branching ratios for the \$\eta(\eta')\rightarrow\bar{\ell}\ell\$ decays, where \$\ell = e,\mu\$. These processes have tiny rates in the standard model due to spin flip, loop, and electromagnetic suppression, for what they could be sensitive to new physics effects. In order to provide a reliable input for the standard model, we use the machinery of Canterbury approximants to provide a systematic description for the underlying hadronic physics in a model-independent fashion. We carefully discuss the role of the resonant region and comment on the reliability of \$\chi\$PT calculations. Finally, we discuss the kind of new physics which would be relevant in these processes given the experimental discrepancies.}, added-at = {2019-02-23T22:09:48.000+0100}, archiveprefix = {arXiv}, author = {Masjuan, Pere and Sanchez-Puertas, Pablo}, biburl = {https://www.bibsonomy.org/bibtex/27449232cced56c9f15777274aee0274f/cmcneile}, citeulike-article-id = {13897314}, citeulike-linkout-0 = {http://arxiv.org/abs/1512.09292}, citeulike-linkout-1 = {http://arxiv.org/pdf/1512.09292}, day = 31, eprint = {1512.09292}, interhash = {bb20ff201bffc9e3f6c51b76055c60d6}, intrahash = {7449232cced56c9f15777274aee0274f}, keywords = {eta}, month = dec, posted-at = {2016-01-04 10:09:16}, priority = {2}, timestamp = {2019-02-23T22:15:27.000+0100}, title = {{\$\eta\$ and \$\eta'\$ decays into lepton pairs}}, url = {http://arxiv.org/abs/1512.09292}, year = 2015 }