Improved Crystal Method for Photon Beam Linear Polarization Measurement at High Energies

A method for photon linear polarization determination based on the measurement of the asymmetry of pairs produced by polarized photons in single crystals within the optimal intervals of pair particles energies is proposed. In difference to the well known methods the asymmetry in this case is essentially larger. The optimal orientation of crystal is found which provides the maximal values for analyzing power and figure of merit as well as minimal measurement time.Comment: 8 pages, 5 figure

Beam spin asymmetry in deeply virtual π\pi production

An interpretation of the beam spin azimuthal asymmetries measured at JLAB in deep exclusive electroproduction of charged and neutral pions is presented. The model combines a Regge pole approach with the effect of nucleon resonances. The $s$- and $u$-channel contributions are described using a dual Bloom-Gilman connection between the exclusive form factors and inclusive deep inelastic structure functions. The results are in agreement with data provided the excitations of nucleon resonances are taken into account.Comment: 5 pages, 3 figures. Talk at the 19th International Spin Physics Symposium (SPIN2010), Sept.27-Oct.2, 2010, Juelich, German

Physical Envoirnment of Camp Mabry, Austin, Texas

This report describes the physical attributes of Camp Mabry, in Austin, Texas, headquarters of Texas Army National Guard training. This is one of five reports completed on training sites; complementary reports describe training sites at Camp Bowie, Camp Swift, Fort Wolters, and King Ranch. The purpose of these five reports is to provide the natural physical data generally reported in an Environmental Assessment (EA) in conformity with the Environmental Protection Act and to present data applicable to an environmental training manual. The data are presented in text and maps; the maps show spatial layers that can be useful when a Geographic Information System (GIS) is later developed for training site management. Most of the data are collected from available sources in state and federal government reports and files.Bureau of Economic Geolog

Physical Environment of Fort Wolters Military Reservation, Parker and Palo Pinto Counties, Texas

The purpose of this report is to describe the physical environment of Fort Wolters Military Reservation and to call attention to physical processes occurring on the base, to note availability of data, and to comment on potential limitations to land use. Fort Wolters (3,985 ac) is one of the training areas administered by the Texas Adjutant General for activities of the Texas Army National Guard. The Bureau of Economic Geology reviewed existing publications to identify essential baseline data (climate; geology, soil properties, hydrology, and present land condition) and made additional observations that will assist the Texas Adjutant General in preparing long-term environmental assessments mandated by the National Environmental Policy Act and U.S. Environmental Protection Agency regulations and environmental land management and land-condition monitoring plans required by the U.S. Army. This report also includes basic digital line graph (DLG) data sets for cultural features, hydrology, topography, and soils. Fort Wolters is located in North-Central Texas in western Parker County and easternmost Palo Pinto County, about 3 mi northeast of the City of Mineral Wells. The area is within the subtropical subhumid climatic region of Texas, with an average annual precipitation of about 29 inches. Intense thunderstorms result in flashy surface runoff, causing erosion of unprotected soils, and flooding and siltation in area creeks. The principal bedrock geologic unit is the Pennsylvanian Mineral Wells Formation, which consists of shale with interbedded sandstone and limestone. Soils are mostly sandy loam and clayey loam. Because of the shaley nature of the Pennsylvanian strata, there are no major freshwater aquifers beneath the base. Limited amounts of fresh water are present in fractures in limestone and sandstone interbeds.Bureau of Economic Geolog

Studies of Transverse Momentum Dependent Parton Distributions and Bessel Weighting

In this paper we present a new technique for analysis of transverse momentum dependent parton distribution functions, based on the Bessel weighting formalism. The procedure is applied to studies of the double longitudinal spin asymmetry in semi-inclusive deep inelastic scattering using a new dedicated Monte Carlo generator which includes quark intrinsic transverse momentum within the generalized parton model. Using a fully differential cross section for the process, the effect of four momentum conservation is analyzed using various input models for transverse momentum distributions and fragmentation functions. We observe a few percent systematic offset of the Bessel-weighted asymmetry obtained from Monte Carlo extraction compared to input model calculations, which is due to the limitations imposed by the energy and momentum conservation at the given energy/Q2. We find that the Bessel weighting technique provides a powerful and reliable tool to study the Fourier transform of TMDs with controlled systematics due to experimental acceptances and resolutions with different TMD model inputs.Comment: 30 pages, 8 figures, enhanced discussion and interpretation of results, new section on errors with an appendix, added references. Accepted for publication in JHE

Charge Asymmetry in 1-1000 GeV Electromagnetic Showers and Possibility of Its Measurementnt

For the high energy electromagnetic showers the thickness dependence of a) the development of electron and positron components, b) the difference between the secondary electron and positron numbers, c) the charge asymmetry of high energy electromagnetic showers, as well as d) the spectral distributions of the components at the shower maxima for various energies of primary particle energies,1 - 1000 GeV were investigated employing GEANT Monte Carlo simulation package. Using these simulation results it is discussed the possibility of observation and study of the charge asymmetry with the help of a magnetic spectrometer which is important for the current and future experiments on the detection of radiowaves produced by high energy neutrinos.Comment: TEX file and 4 figure

Beam Single-Spin Asymmetry in Semi-Inclusive Deep Inelastic Scattering

We calculate, in a model, the beam spin asymmetry in semi-inclusive jet production in deep inelastic scattering. This twist-3, $T$-odd observable is non-zero due to final state strong interactions. With reasonable choices for the parameters, one finds an asymmetry of several percent, about the size seen experimentally. We present the result both as an explicit asymmetry calculation and as a model calculation of the new transverse-momentum dependent distribution function $g^\perp$.Comment: 10 pages, 6 figures; minor changes made in the discussion; version accepted for publicatio

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

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

HAL/S-360 compiler system specification

A three phase language compiler is described which produces IBM 360/370 compatible object modules and a set of simulation tables to aid in run time verification. A link edit step augments the standard OS linkage editor. A comprehensive run time system and library provide the HAL/S operating environment, error handling, a pseudo real time executive, and an extensive set of mathematical, conversion, I/O, and diagnostic routines. The specifications of the information flow and content for this system are also considered