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...

The cross section of the process e+e− → ωπ0 → π0π0γ has been measured in the c.m. energy range 920–1380 MeV with the CMD-2 detector. Its energy dependence is well described by the interference of the ρ(770) and ρ(1450) mesons decaying to ωπ0. Upper limits for the cross sections of the direct processes e+e− → π0π0γ, ηπ0γ have been set.

The cross section of the process e+e− → ωπ0 → π0π0γ has been measured in the c.m. energy range 920–1380 MeV with the CMD-2 detector. Its energy dependence is well described by the interference of the ρ(770) and ρ(1450) mesons decaying to ωπ. Upper limits for the cross sections of the direct processes e+e− → π0π0γ, ηπ0γ have been set.

Abstract The scale-free gravothermal fluid formalism has long proved effective in describing the evolution of self-interacting dark matter halos with a constant particle cross section. However, whether solutions match numerical simulations for velocity-dependent cross-section scenarios remains untested. In this work, we provide fast mapping method that relates constant-cross-section solution to...

PREVIOUS papers1 in this series have dealt with (a) the evaluation of radial wavefunctions, phase shifts, reduced phases, and differential elastic cross sections for scattering by a L-J (12, 6) potential; (b) the resulting velocity dependence of the differential and total scattering cross sections, with attention given to the Jeffreys-Born OB) approximation for the higher-order phases; (c) the ...

Gribov's inelastic shadowing makes nuclei more transparent and reduce nuclear cross sections, especially when QCD dynamics (color transparency) is at work. This effect steeply rising with energy has an important impact on the recent results for high-p T hadron production at RHIC. Only the shape of p T-dependence of the d − Au to pp ratio was measured, but the absolute value was calculated. Thos...

Gribov's inelastic shadowing makes nuclei more transparent and reduce nuclear cross sections, especially when QCD dynamics (color transparency) is at work. This effect steeply rising with energy has an important impact on the recent results for high-p T hadron production at RHIC. Only the shape of p T-dependence of the d − Au to pp ratio was measured, but the absolute value was calculated. Thos...

We report multiplet-specific photoionization cross sections and photoelectron angular distributions for the 3ug orbital of 0 2 leading to the b 4 l:gand B 2l:gion states obtained using Hartree-Fock photoelectron orbitals. These cross sections show significant nonstatistical behavior at low photoelectron energies which arises from the sensitivity of the kuu shape resonance to the exchange potent...

Coulomb Dissociation provides an alternative method for determining the radiative capture cross sections at astrophysically relevant low relative energies. For the breakup of 8 B on 58 Ni, we calculate the total Coulomb Dissociation cross section and the angular distribution for E1, E2 and M1. Our calculations are performed first within the standard first order semiclassical theory of Coulomb E...

A Monte Carlo program is presented for the computation of the most general cross section for two-photon production in ee collisions at fixed twophoton invariant mass W . Functions implemented for the five γγ structure functions include three models of the total hadronic cross section and the lepton-pair production cross section. Prospects of a structure-function determination through a study of...