title: Flavor decomposition of the elastic nucleon electromagnetic form factors.
abstract: The u- and d-quark contributions to the elastic nucleon electromagnetic form factors have been determined by using experimental data on G(E)(n), G(M)(n), G(E)(p), and G(M)(p). Such a flavor separation of the form factors became possible up to negative four-momentum transfer squared Q(2) = 3.4 GeV(2) with recent data on G(E)(n) from Hall A at Jefferson Lab. For Q(2) above 1 GeV(2), for both the u and the d quark, the ratio of the Pauli and Dirac form factors, F(2)/F(1), was found to be almost constant in sharp contrast to the behavior of F(2)/F(1) for the proton as a whole. Also, again for Q(2)>1 GeV(2), both F(2)(d) and F(1)(d) are roughly proportional to 1/Q(4), whereas the dropoff of F(2)(u) and F(1)(u) is more gradual.
authors.affiliation: University of Virginia, Charlottesville, Virginia 22903, USA.
authors.forename: G D
authors.initials: GD
authors.lastname: Cates
authors.forename: C W
authors.initials: CW
authors.lastname: de Jager
authors.forename: S
authors.initials: S
authors.lastname: Riordan
authors.forename: B
authors.initials: B
authors.lastname: Wojtsekhowski