出版社:SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要:We present preliminary results for the electromagnetic form factors of vector mesons in lattice
QCD. The analysis is based on two- and three-point functions, calculated with two-flavour
clover-improved configurations for a lattice spacing of a ∼ 0.08 fm. The pions on these lattices
are too heavy (mp ≥ 400 MeV) to allow for r meson decay. We obtain a charge radius
r2
∼ 0.49(5) fm2, a g-factor gr ∼ 1.6(1), and a small negative quadrupole moment
mQ = −0.017(2) fm2.