title: Moments of the longitudinal proton structure function FL from global data in the Q(2) range 0.75-45.0  (GeV/c)(2).
abstract: We present an extraction of the lowest three moments of the proton longitudinal structure function FL from world data between Q(2)=0.75 and 45  (GeV/c)(2). The availability of new FL data at low Bjorken x from HERA and at large x from Jefferson Lab allows the first determination of these moments over a large Q(2) range, relatively free from uncertainties associated with extrapolations into unmeasured regions. The moments are found to be underestimated by leading twist structure function parametrizations, especially for the higher moments, suggesting either the presence of significant higher twist effects in FL and/or a larger gluon distribution at high x.
authors.affiliation: Hampton University, Hampton, Virginia 23668, USA.
authors.forename: P
authors.initials: P
authors.lastname: Monaghan
authors.affiliation: Hampton University, Hampton, Virginia 23668, USA and Jefferson Lab, Newport News, Virginia 23606, USA.
authors.forename: A
authors.initials: A
authors.lastname: Accardi
authors.affiliation: Hampton University, Hampton, Virginia 23668, USA.
authors.forename: M E
authors.initials: ME
authors.lastname: Christy
authors.affiliation: Hampton University, Hampton, Virginia 23668, USA.
authors.forename: C E
authors.initials: CE
authors.lastname: Keppel
authors.affiliation: Jefferson Lab, Newport News, Virginia 23606, USA.
authors.forename: W
authors.initials: W
authors.lastname: Melnitchouk
authors.affiliation: Hampton University, Hampton, Virginia 23668, USA.
authors.forename: L
authors.initials: L
authors.lastname: Zhu