H1prelim-08-011

Measurement of the diffractive longitudinal structure function F_L^D at HERA II

Reference Preliminary results expected for summer 2008,
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Abstract A first measurement of the longitudinal diffractive structure function $F_L^D$ using the H1 detector at HERA is presented. The structure function is extracted from first measurements of the diffractive cross section at centre of mass energies $\sqrt{s}$ of 225 and 252 GeV, together with a new measurement at $\sqrt{s}$ of 319 GeV, using data taken in 2007 at high values of inelasticity $y$. The measured $F_L^D$ is compared to predictions from NLO QCD fits to previous measurements of the inclusive diffractive DIS cross section.
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