Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10722200 | Physics Letters B | 2009 | 7 Pages |
Abstract
We examine the quark mass dependence of the pion vector form factor, particularly the curvature (mean quartic radius). We focus our study on the consequences of assuming that the coupling constant of the Ï to pions, gÏÏÏ, is largely independent of the quark mass while the quark mass dependence of the Ï mass is given by recent lattice data. By employing the Omnès representation we can provide a very clean estimate for a certain combination of the curvature and the square radius, whose quark mass dependence could be determined from lattice computations. This study provides an independent access to the quark mass dependence of the ÏÏÏ coupling and in this way a non-trivial check of the systematics of chiral extrapolations. We also provide an improved value for the curvature for physical values for the quark masses, namely ãr4ã=0.73±0.09 fm4 or equivalently cV=4.00±0.50 GeVâ4.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Nuclear and High Energy Physics
Authors
Feng-Kun Guo, Christoph Hanhart, Felipe J. Llanes-Estrada, Ulf-G. MeiÃner,