H1prelim-10-017

Measurement of the longitudinal diffractive structure function F_L^D at low Q^2 at HERA

Reference Preliminary DIS2010, April 2010
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Abstract A measurement of the longitudinal diffractive structure function F_L^D at low Q^2 using the H1 detector at HERA is presented. Measurements of the diffractive cross-section at centre of mass energies \sqrt{s} of 225 and 252 GeV in the Q^2 range of [2.5; 7] GeV^2, using HERA data taken in 2007, are combined with a published measurement at $\sqrt{s}$ of 300 GeV. The structure function F_L^D is extracted from these cross-sections at high values of inelasticity y. The measured values of F_L^D are compared with extrapolations of NLO QCD fits to published data, where the fits only included data with Q^2 > 8.5 GeV^2.
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