Measurement of the Inclusive Cross Section for Diffractive Deep Inelastic Scattering at High Q^2

Reference Y Coppens, presented at DIS 2003, Spring 2003
Document Conference paper
Figures  (1)  (2)  (3a)  (3b)  (3c)  (3d)  (3e)  (3f)  (4)  (5)  (6)  (7)  (8)  (9a)  (9b)  (10a)  (10b)  (11)
Contact P.Laycock
Abstract A measurement is presented of inclusive diffractive deep inelastic scattering extending to the largest Q^2 values accessed to date. Data taken by the H1 experiment amounting to an integrated luminosity of 63 pb^-1 are used to investigate the process ep -> eXY in the kinematic range where diffractive exchanges are known to dominate. The Y system is a proton or proton remnant with M_Y < 1.6 GeV and |t| < 1.0 GeV^2 and it is separated from the X system by a large gap in pseudorapidity. The diffractive reduced cross-section sigma_r^D(beta, Q^2 x_pom) is extracted in the kinematic range 200 < Q^2 < 1600 GeV^2, 0.1 < (beta = x / xpom) < 0.9 and 0.0036 < xpom < 0.05. The data are used together with other recent measurements at lower Q^2 to test various factorisation properties and models of diffractive DIS. Good agreement is found with predictions based on diffractive parton densities obtained from an NLO QCD fit to lower Q^2 data, evolved using the DGLAP equations, and with a model based on soft colour interactions.
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