We calculate diffractive dijet production in deep-inelastic scattering at next-to-leading order of perturbative QCD, including contributions from direct and resolved photons, and compare our predictions to preliminary data from the H1 collaboration at HERA. We study how the cross section depends on the factorization scheme and scale Mγ at the virtual photon vertex for the occurrence of factoriz...

The resummation of threshold logarithms for direct photon production cross sections in hadronic collisions is presented. The resummation is based on the factorization properties of the cross section and is formulated at next-to-leading logarithmic or higher accuracy. Full analytical and numerical results for the next-to-next-toleading order expansion of the resummed cross section are given. A s...

The production of forward jets of transverse momentum pT (j) ≈ Q and large momentum fraction xjet ≫ x probes the onset of BFKL dynamics at HERA. A full O(α2s) calculation of the inclusive forward jet cross section is presented and compared to the expected BFKL cross section. The kinematical region populated by these events and the scale dependence of the fixed order perturbative QCD cross secti...

P.-G. Reinhard, ∗ A.S. Umar, † P. D. Stevenson, ‡ J. Piekarewicz, § V.E. Oberacker, ¶ and J.A. Maruhn ∗∗ Institut für Theoretische Physik, Universität Erlangen, D-91054 Erlangen, Germany Department of Physics and Astronomy, Vanderbilt University, Nashville, TN 37235, USA Department of Physics, University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom Department of Physics, Florida State ...

Angular distributions of protons, deuterons, tritons and a-particles were measured for the system 9Be+"C at lab energies between 12 and 27 MeV. The compound nucleus model with level densities calculated according to the Gilbert-Cameron formula describes satisfactorily the measured proton, deuteron and triton data. In the a-particle spectra contributions from other processes seem to be present ....

We present results for the pp → ppω reaction studied by considering two different scenarios: with and without the inclusion of nucleon resonance excitations. The recently measured angular distribution by the COSY-TOF Collaboration at an excess energy of Q = 173 MeV and the energy dependence of the total cross section data for π−p → ωn are used to calibrate the model parameters. The inclusion of...

The production of forward jets of transverse momentum p T (j) Q and large momentum fraction x jet x probes the onset of BFKL dynamics at HERA. A full O(2 s) calculation of the inclusive forward jet cross section is presented and compared to the expected BFKL cross section. The kinematical region populated by these events and the scale dependence of the xed order perturbative QCD cross sections ...

http://dx.doi.org/10.1016/j.optmat.2015.06.033 0925-3467/ 2015 Elsevier B.V. All rights reserved. ⇑ Corresponding author at: Institute of Applied Physics, Vienna University of Technology, Wiedner Hauptstrasse. 8-10, 1040 Vienna, Austria. E-mail address: [email protected] (A. Ajami). Aliasghar Ajami a,b,⇑, Peter Gruber , Maximilian Tromayer , Wolfgang Husinsky , Jürgen Stampfl , Robert Lisk...

We examine the absorption cross section of the massive scalar field for the higher-dimensional extended object. Adopting the usual quantum mechanical matching conditions between the asymptotic and near-horizon solutions in radial equation, we check whether or not the universal property of the absorption cross section, which is that the low-energy cross section is proportional to the surface are...

Measurements of the differential cross sections for the He(y, n) He and He(y, p)3H reactions have been performed for photon energies in the 100 — 360 MeU region. Results were obtained for nucleon center-of-mass angles close to 60', 90', and 120' by detecting the recoiling nuclei with a magnetic spectrometer. Both (y,p) and (y,n) cross sections are forward peaked and fall rapidly as a function o...