RT Journal Article
T1 Quark mass dependence of the pion vector form factor
A1 Llanes Estrada, Felipe José
A1 Feng Kun, Guo
A1 Hanhart, Christoph
AB 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 ρ to pions, gρππ , is largely independent of the quark mass while the quark mass dependence of the ρ 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 ρππ 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 hysical values for the quark masses, namely (r(4)) = 0.73±0.09 fm(4) or equivalently c(V) = 4.00±0.50 GeV(−4).
PB Elsevier Science BV
SN 0370-2693
YR 2009
FD 2009-07-06
LK https://hdl.handle.net/20.500.14352/43962
UL https://hdl.handle.net/20.500.14352/43962
LA eng
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NO © 2009 Elsevier B.V. All rights reserved.We would like to thank Stephan Durr and Jose Pelaez for useful discussions. This work is supported in part by grants FPA 2004-02602, 2005-02327, FPA2007-29115-E (Spain), and by the Helmholtz Association through funds provided to the virtual institute "Spin and strong QCD" (VH-VI-231). F.J.L.E. thanks the members of the IKP (Theorie) at Forschungszentrum Julich for their hospitality during the preparation of this work and the Fundacion Flores Valles for economical support.
NO Helmholtz Association
NO Fundacion Flores Valles
DS Docta Complutense
RD 29 abr 2024