We report on the generation of photon pairs in the 1550-nm band suitable for longdistance fiber-optic quantum key distribution. The photon pairs were generated in a periodically poled lithium niobate waveguide with a high conversion-efficiency. Using a pulsed semiconductor laser with a pulse rate of 800 kHz and a maximum average pump power of 50 μW, we obtained a coincidence rate of 600 s−1. Ou...

The dijet cross section as a function of both the fraction of the photon momentum participating in the hard process, x OBS γ , and the photon's virtuality, Q 2 , is compared with the predictions of Herwig 5.9 for various photon parton distribution functions. The ratio of dijet cross sections with x OBS γ < 0.75 and x OBS γ > 0.75 is measured as a function of Q 2. This ratio is found to decrease...

A QCD analysis of ¯ pN → γ * π and ¯ pN → γ * γ Where is the pion in the proton ? We study the scaling regime of nucleon-anti-nucleon annihilation into a deeply virtual photon and a photon or meson, ¯ pN → γ * π, ¯ pN → γ * γ, in the forward direction. The leading twist amplitude factorizes into an antiproton distribution amplitude, a short-distance matrix element and a long-distance dominated ...

This paper presents a simple three phase power flow method for solution of three-phase unbalanced radial distribution system (RDN) with voltage dependent loads. It solves a simple algebraic recursive expression of voltage magnitude, and all the data are stored in vector form. The algorithm uses basic principles of circuit theory and can be easily understood. Mutual coupling between the phases h...

Introduction: Today, radiotherapy combined with surgery in the treatment of parotid tumors widely are used specially for high grade parotid tumors. One of concern and challenge issue of radiotherapy is that the treatment of these tumors with irregular surface due to the presence of external ear and region of different physical electron density (air cavities, dense bone, soft t...

We calculate the photon production cross section arising from the hard scattering of partons in nuclear collisions by taking into account the intrinsic parton transverse momentum distribution and the next-to-leading-order contributions. As first pointed out by Owens, the inclusion of the intrinsic transverse momentum distribution of partons leads to an enhancement of photon production cross sec...

The photon is a very interesting object for QCD studies since it has both a pointlike coupling to quarks, which yields a perturbative part of photons wave function, and a non-perturbative coupling related to the magnetic susceptibility of the QCD vacuum and which builds its chiral-odd twist-2 distribution amplitude. The first feature allows us to compute the photon anomalous generalized parton ...

The light front densities of momentum, angular and intrinsic pressure are calculated for the photon, both in free case at leading order quantum electrodynamics. In latter case, we moreover decompose form factors into photon electron contributions. Circularly linearly polarized photons considered, with containing significant azimuthal modulations momentum density stresses. We find that $D$-term ...