F2D3 with VFPS

Reference Preliminary DIS2010, April 2010
Figures  (1a)  (1b)  (2a)  (2b)  (3)  (4a)  (4b)  (4c)  (4d)  (4e)  (4f)  (5)  (6)  (7)  (8)  (f2d3summary_Q2)
Abstract In 2004, the H1 Collaboration at HERA installed the Very Forward Proton Spectrometer (VFPS) located at 220m from the interaction point, in the cold section of the proton ring. The spectrometer consists of two Roman Pot stations equipped with scintillating fiber detectors. The device allows the measurement of diffractive proton momentum in the range 0.009 < xpom < 0.025, where xpom is the energy fraction lost by the proton in the interaction, with a very high acceptance (above 90%). The inclusive diffractive deep inelastic scattering, ep -> e gamma* p -> e X p, has been measured with the H1 detector at HERA using VFPS to measure the scattered proton momentum. The data correspond to an integrated luminosity of 95 pb-1. The cross section has been measured for virtualities of the exchanged boson, 5 < Q^2 < 100 GeV^2 and in the range 0.005 < beta < 0.8, where beta=x/xpom. The cross section is measured differentially in Q^2, xpom and beta and compared to previously measured cross section at HERA.
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