In this thesis an analysis of diffractive J/ψ photoproduction and electroproduction in epcollisions is presented. The data were collected with the H1 detector and correspond to an integrated luminosity of 54.79pb−1. The kinematic range covers the region of 40GeV < W < 160GeV and −t < 1.2GeV, where W is the centre-of-mass energy in the photonproton system and −t is the squared four-momentum tran...

We discuss a dispersion relation in the photon mass and show how (in principle) model-independent constraints on the parton distribution functions of the photon, notably a momentum sumrule, can be obtained. We present two sets of parametrizations, SaS 1 and 2, corresponding to two rather extreme realizations of the non-perturbative part. Inclusive electron scattering off a real photon is found ...

Geometric scaling is a novel scaling phenomenon observed in deep inelastic scattering at small x: the total γ * p cross section depends upon the two kinematical variables Q 2 and x only via their combination ξ ≡ Q 2 R 2 0 (x), with R 2 0 (x) ∝ x λ. At sufficiently low Q 2 , below the saturation scale Q 2 s (x) (∼ a few GeV 2), this phenomenon finds a natural explanation as a property of the Col...

The virtuality of the target photon, P , has to be much smaller than the virtuality Q of the probe photon such that the neglected terms of order O(P /Q) are small. In the following, we are interested in the photon structure function F γ(P ) 2 (x,Q ) which enters the deep inelastic electron photon cross section in exactly the same way as is well known from deep inelastic electron proton scattering

We evolve virtual photon parton densities up to the SUSY threshold and higher using coupled inhomogeneous DGLAP differential equations. Reliable input parameterizations were available from the c-quark threshold. Limited P 2 ( target photon virtuality ) dependence is observed. The difference to the photon structure function is shown to be significant with the introduction of SUSY dependent split...

The sharing of knowledge within teams is critical to team functioning. However, working with team members who are in different locations (i.e. in virtual teams) may introduce communication challenges and reduce opportunities for rich interactions, potentially affecting knowledge sharing and its outcomes. Therefore, using questionnaire-based data, this study examined the potential effects of dif...

We present a systematic analysis of the polarised and unpolarised processes e+ e → e + e − X in the deep inelastic limit and study the effects of target photon mass (virtuality) on the photon structure functions. The effect of target photon virtuality manifests as new singly polarised structure functions and also alters the physical interpretation of the unpolarised structure functions. The phy...

An explicit solution for the vibration of a carbon chain inside carbon nanotubes (CNTs) was obtained using continuum modeling of the van der Waals (vdW) interactions between them. The effect of the initial tensile force and the amplitude of the carbon chain as well as the radii of the CNTs on the vibration frequency were analyzed in detail, respectively. Our analytical results show that the vib...