Diffractive Component in pp Collisions at 102 and 405 GeV

We study the diffractive component in $\mathrm{pp}$ collisions at 102 and 405 GeV and examine its energy dependence in ${M}^{2}$ and $x$ variables. The total cross section for $|x|>0.9$ remains approximately constant: 6.6\ifmmode\pm\else\textpm\fi{}0.5 and 6.8\ifmmode\pm\else\textpm\fi{}0.7 mb at the two energies. However, both $\frac{d\ensuremath{\sigma}}{\mathrm{dx}}$ and $\frac{d\ensuremath{\sigma}}{d{M}^{2}}$ show strong energy dependence within the $|x|>0.9$ region. The energy and ${M}^{2}$ dependences of $\frac{d\ensuremath{\sigma}}{d{M}^{2}}$ do not have the characteristics of a triple-Pomeron term for $0.90<|x|<0.99$.