903 research outputs found

    A New Formula for the Mass of a Stationary Axisymmetric Configuration

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    It has been shown by one of the authors1^1 that in isotropic spherical coordinates there is a relation between the mass of a static spherical gravitating body and the pressure distribution inside it. In this paper the result is generalized for the case of stationary axisymmetric configurations.Comment: Plain Tex; 6 page

    Performance of the Electromagnetic Calorimeter of the HERMES Experiment

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    The performance of the electromagnetic calorimeter of the HERMES experiment is described. The calorimeter consists of 840 radiation resistant F101 lead-glass counters. The response to positrons up to 27.5 GeV, the comparison between the measured energy and the momentum reconstructed from tracking, long-term stability, hadron rejection and neutral meson invariant mass reconstruction are shown.Comment: 22 pages, 13 figures, LaTeX, accepted by NI

    Investigations of Azimuthal Asymmetry in Semi-Inclusive Leptoproduction

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    We consider the azimuthal asymmetries in semi-inclusive deep inelastic leptoproduction arising due to both perturbative and nonperturbative effects at HERMES energies and show that the kT2/Q2k_T^2/Q^2 order corrections to <cosϕ>< \cos\phi > and aresignificant.Wealsoreconsidertheresultsofperturbativeeffectsfor are significant. We also reconsider the results of perturbative effects for at large momentum transfers \cite{A1} using the more recent sets of scale-dependent distribution and fragmentation functions, which bring up to 18{%} difference in .Inthesameapproachwecalculatethe. In the same approach we calculate the as well.Comment: 8 pages, LaTeX, 6 PS figures, final version, to appear in EPJ

    Single target-spin asymmetries in semi-inclusive pion electroproduction on longitudinally polarized protons

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    We evaluate the single target-spin sin(phi_h) and sin(2\phi_h) azimuthal asymmetries in the semi-inclusive deep inelastic lepton scattering off longitudinally polarized proton target under HERMES kinematic conditions. A good agreement with the HERMES data can be achieved using only the twist-2 distribution and fragmentation functions

    Determination of the cross section of the proton, pion and neutron inelastic interaction with lead and carbon nuclei at 0.5 - 5.0 TeV energies (PION experiment)

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    Experimental results on the cross section of the single pion, proton and neutron inelastic interaction with carbon and lead nuclei in the 0.5 to 5.0 TeV energy interval obtained on the PION installation (Mount Aragats, Armenia, 3250 m) are presented. For this purpose the (N pi)/(N p) and inelastic (p Fe)/(pi Fe) ratios measured directly on the installation as well as the calculated inelastic (p A)/(pi A) dependence on the target nucleus atomic numbers were used

    Some new processes in the collisions of high energy ions and electrons with amorphous or crystalline target atoms

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    It is shown that taking into account the energy levels of the ions and/or of the crystalline atoms, some energy transfer and excitation processes with consequences similar to the Kossel and Okorokov effects can take place when some additional resonance conditions are satisfied. Such resonance processes can be expected also when microbunched electron beams interact with ions. Since these processes have significant cross-sections and the interaction of projectile ions with atoms of crystals has not been almost studied, it is proposed to begin their study in Kossel- and Okorokov-type experiments
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