Hard exclusive photoproduction of Φ\Phi mesons

We calculate the differential cross section and single-polarization observables for the reaction $\gamma p \to \Phi p$ within perturbative QCD, treating the proton as a quark-diquark system. The phenomenological couplings of gauge bosons to (spatially extended) diquarks and the quark-diquark distribution amplitude of the proton are adopted from previous investigations of baryon form factors and two-photon processes. Going beyond leading order, we take into account hadron-mass effects by means of a systematic expansion in the small parameter (hadron mass/ photon energy). With the $\Phi$-meson distribution amplitude taken from the literature our predictions for the differential cross section at | t | \agt 4 \text{GeV}^2 seem to provide a reasonable extrapolation of the low-t data and are also comparable in magnitude with the results of a two-gluon exchange model in which the gluons are considered as a remnant of the pomeron. For momentum transfers of a few GeV hadron-mass effects appear still to be sizeable.Comment: 37 pages, 7 figures, uses RevTeX styl

A study of the nuclear medium influence on transverse momentum of hadrons produced in deep inelastic neutrino scattering

The influence of nuclear effects on the transverse momentum $(p_T)$ distributions of neutrinoproduced hadrons is investigated using the data obtained with SKAT propane-freon bubble chamber irradiated in the neutrino beam (with $E_{\nu}$ = 3-30 GeV) at Serpukhov accelerator. Dependences of $$on the kinematical variables of inclusive deep-inelastic scattering and of the produced hadrons are measured. It has been observed, that the nuclear effects cause an enhancement of$$ of hadrons (more pronounced for the positively charged ones) produced in the target fragmentation region at low invariant mass of the hadronic system (2 $< W <$ 4 GeV) or at low energies transferred to the current quark (2 $< \nu < 9$ GeV). At higher $W$ or $\nu$, no influence of nuclear effects on $$ is observed. Measurement results are compared with predictions of a simple model, incorporating secondary intranuclear interactions of hadrons (with a formation length extracted from the Lund fragmentation model), which qualitatively reproduces the main features of the data.Comment: 23 pages, 7 figure

What We Know AboutOffenders Who Drive Under the Influence: Analysis of Court Case FileReviews

This paper presents findings from a quantitative study about alcohol-impaired drivers in Utah. The University of Utah\u27s Social Research Institute conducted a retrospective case file evaluation about the adjudication and sanctioning phases associated with driving under the influence (DUI) to determine Utah\u27s response to DUI crime from arrest forward. Although Utah driver\u27s license and court systems are on the cutting edge of dealing with DUI offenders, we found a variety of limitations for analysis due to data collection and entry. Therefore, it is difficult to develop a thorough understanding about the process of dealing with DUI offenders and the effectiveness of court actions and treatments. The purpose of this paper is to provide recommendations about how to ensure more accurate data collection about impaired drivers

A Meta-Analysis ofFather Involvement in Parent Training

Objective: Investigate (a) whether including fathers in parent training enhances outcomes and (b) whether mothers and fathers benefit equally from parent training. Method: Using traditional meta-analysis methodology, 26 studies that could answer the research questions were identified and meta-analyzed. Results: Studies that included fathers, compared with those that did not, reported significantly more positive changes in children\u27s behavior and desirable parenting practices, but not in perceptions toward parenting. Compared with mothers, fathers reported fewer desirable gains from parent training. Conclusions: Fathers should not be excluded from parent training and should be encouraged to attend. Further research should seek to understand how parent-training programs might better meet the needs of fathers