This talk summarizes the exclusive production of the 0 ; ! and vector mesons in e + p collisions as observed by the ZEUS and H1 collaborations at HERA. Mass distributions, helicity decay distributions and cross sections are presented as functions of the center of mass energy (W) and momentum transfer squared of either the proton (jtj) or incident virtual photon (?Q 2).

We present a new characterization of Cartan isoparametric hypersurfaces in terms of properties of the polynomial that determines the algebraic set of planar normal sections on the homogeneous isoparametric hypersurfaces in spheres. We show that Cartan isoparametric hypersurfaces are the only homogeneous isoparametric hypersurfaces in spheres for which the infinity Laplacian of the polynomial th...

<p style='text-indent:20px;'>Joint densities for a sequential pair of returns with weak autocorrelation and strong correlation in squared are formulated. The marginal return either variance gamma or bilateral gamma. Two-dimensional matching empirical characteristic functions to its theoretical counterpart is employed dependency parameter estimation. Estimations reported 3920 daily sequenc...

Dijet cross sections in deep-inelastic scattering have been measured with the H1 detector at the positron proton collider HERA using data taken in the years 1994 – 1997 corresponding to an integrated luminosity of Lint ' 36 pb 1. A large kinematical range of squared four momentum transfers 10 < Q2 < 5000 GeV2, squared transverse jet energies 70 < E2 ?Breit < 1200 GeV2 and invariant dijet masses...

We report measurements of the differential cross sections of P” and $ meson photoproduction on hydrogen for a range of fourmomentum transfer squared, t , from -0. 2(GeV/c)2 to -0. 9(GeV/c)2 and a range of incident photon energies from 6.5 GeV to 17.8 GeV. We find that differential cross sections obtained for p” production are in good agreement with the vector dominance model. * Work supported b...

The structure of real and virtual photons has been studied in ep collisions at HERA using dijet production. Measurements of differential dijet cross sections as function of the fraction of photon’s momentum invested in the dijet system are presented. The dependence of the cross sections on the virtuality of the photon and mean transverse energy squared of the two leading jets has been investiga...