H1 Diffractive Structure Functions Measurement from new data

Abstract

New measurements of the reduced cross section ${\sigma }_r^{D(3)}$ for the diffractive process $ep\to eXY$ in the kinematic domain $12\le Q^2\le 90$ GeV${}^2$, $0.01\le \beta \le 0.65$ and $\xpom<0.1$ are presented. Data events recorded by the H1 detector during the years 1999--2000 and 2004 have been used, corresponding to a total integrated luminosity of 68 pb${}^{-1}$. The measurements are derived in the same range as previous H1 data, namely $M_Y<1.6$ GeV and $|t|<1.0$ GeV${}^2$. Two different analysis methods, rapidity gap and $M_X$, are used and similar results are obtained in the kinematic domain of overlap. Finally, together with previous data, the diffractive structure function measurements are analysed with a model based on the dipole formulation of diffractive scattering. It is found to give a very good description of the data over the whole kinematic range.

4 pages, 4 figure; To appear in the proceedings of 14th International Workshop on Deep Inelastic Scattering (DIS 2006), Tsukuba, Japan, 20-24 Apr 2006

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