%0 Journal Article %1 Nebreda2010Strange %A Nebreda, J. %A Pelaez, %D 2010 %K chiralpert, resonance %T Strange and non-strange quark mass dependence of elastic light resonances from SU(3) Unitarized Chiral Perturbation Theory to one loop %U http://arxiv.org/abs/1001.5237 %X We study the light quark mass dependence of the f\_0(600), kappa(800), rho(770) and K*(892) resonance parameters generated from elastic meson-meson scattering using unitarized one-loop Chiral Perturbation Theory. First, we show that it is possible to fit simultaneously all experimental scattering data up to 0.8-1 GeV together with lattice results on decay constants and scattering lengths up to a pion mass of 400 MeV, using chiral parameters compatible with existing determinations. Then, the strange and non-strange quark masses are varied from the chiral limit up to values of interest for lattice studies. In these amplitudes, the mass and width of the rho(770) and K*(892) present a similar and smooth quark mass dependence. In contrast, both scalars present a similar non-analyticity at high quark masses. Nevertheless, the f\_0(600) dependence on the non-strange quark mass is stronger than for the kappa(800) and the vectors. We also confirm the lattice assumption of quark mass independence of the vector two-meson coupling that, in contrast, is violated for scalars. As a consequence, vector widths are very well approximated by the KSRF relation, and their masses are shown to scale like their corresponding meson decay constants.

@article{Nebreda2010Strange, abstract = {{We study the light quark mass dependence of the f\_0(600), kappa(800), rho(770) and K*(892) resonance parameters generated from elastic meson-meson scattering using unitarized one-loop Chiral Perturbation Theory. First, we show that it is possible to fit simultaneously all experimental scattering data up to 0.8-1 GeV together with lattice results on decay constants and scattering lengths up to a pion mass of 400 MeV, using chiral parameters compatible with existing determinations. Then, the strange and non-strange quark masses are varied from the chiral limit up to values of interest for lattice studies. In these amplitudes, the mass and width of the rho(770) and K*(892) present a similar and smooth quark mass dependence. In contrast, both scalars present a similar non-analyticity at high quark masses. Nevertheless, the f\_0(600) dependence on the non-strange quark mass is stronger than for the kappa(800) and the vectors. We also confirm the lattice assumption of quark mass independence of the vector two-meson coupling that, in contrast, is violated for scalars. As a consequence, vector widths are very well approximated by the KSRF relation, and their masses are shown to scale like their corresponding meson decay constants.}}, added-at = {2019-02-23T22:09:48.000+0100}, archiveprefix = {arXiv}, author = {Nebreda, J. and Pelaez}, biburl = {https://www.bibsonomy.org/bibtex/2152d81f70464e5722067dbbfbcbfff16/cmcneile}, citeulike-article-id = {6602768}, citeulike-linkout-0 = {http://arxiv.org/abs/1001.5237}, citeulike-linkout-1 = {http://arxiv.org/pdf/1001.5237}, day = 28, eprint = {1001.5237}, interhash = {a8affbe8151dbb577b99f24195077245}, intrahash = {152d81f70464e5722067dbbfbcbfff16}, keywords = {chiralpert, resonance}, month = jan, posted-at = {2010-01-29 09:27:53}, priority = {2}, timestamp = {2019-02-23T22:15:27.000+0100}, title = {{Strange and non-strange quark mass dependence of elastic light resonances from SU(3) Unitarized Chiral Perturbation Theory to one loop}}, url = {http://arxiv.org/abs/1001.5237}, year = 2010 }