A review is given of the various determinations of the different πNN coupling constants in analyses of the low-energy pp, np, pp, and πp scattering data. The most accurate determinations are in the energy-dependent partial-wave analyses of the NN data. The recommended value is f 2 = 0.075. A recent determination of f 2 by the Uppsala group from backward np cross sections is shown to be model de...

We calculate first-order QCD corrections to the cross section for single top quark production mediated by flavor changing neutral currents (FCNC) in ep collisions at the HERA collider. We find that the uncertainty due to the choice of the QCD scale is significantly reduced. This study is motivated by the current experimental work for limits on the FCNC single top cross section. On leave of abse...

The differential cross section for n-p elastic scattering at 459 MeV in the c.m. angular region 50' & 0* & 180' has been measured with high statistical precision and good relative accuracy. The uncertainty in the absolute normalization (based on the simultaneously measured yield of deuterons from the np ~der reaction) was initially estimated to be -7%. The results agree well with back-angle dat...

Jet cross sections in deep-inelastic scattering over a wide region of phase space have been measured at HERA. These cross section measurements provide a thorough test of the implementation of Quantum Chromodynamics in next-toleading order (NLO) calculations. They also provide the opportunity to test the consistency of the gluon distribution in the proton as extracted from (mainly) inclusive DIS...

We present a calculation of the single top quark cross section for proton-antiproton interactions with √ s = 1.8 TeV at the Fermilab Tevatron collider. We examine the effects of top mass, parton distribution functions, QCD scale, and collision energy, on each of the component production mechanisms, and study the kinematic distributions for standard model electroweak production. At the upgraded ...

Today, object-oriented requirements specifications typically combine a scenario (or use case) model and a class model for expressing functional requirements. With any such combination, the problem of consistency between these two models arises. In this paper, we present a lightweight approach to consistency between a scenario model and a class model. We assume semi-formal, loosely coupled model...

We calculate flavor-changing neutral-current (FCNC) processes involving top-quark production via anomalous tqV couplings at the Tevatron and HERA colliders. We cover the FCNC processes pp̄ → tZ, pp̄ → tγ, pp̄ → tt, and ep → et. We go beyond leading order and include the effects of soft-gluon corrections through next-to-next-to-leading order. We demonstrate the stabilisation of the cross section wi...

We reinvestigate theJ/ψ dissociation processes induced by the reactions with nucleons, J/ψ+N → D̄+ c, in the meson-exchange model. Main constraints used in this work are vector-meson dominance and charm vector-current conservation. We show that the cross section for J/ψ +N → D̄ + c can be larger than that for J/ψ+N → D̄ + c when these constraints are imposed. The dependence of the cross sections o...

I discuss the motivation for resummation of the effects of initial-state soft gluon radiation, to all orders in the strong coupling strength, for processes in which the near-threshold region in the partonic subenergy is important. I summarize the method of “perturbative resummation” and its application to the calculation of the total cross section for top quark production at hadron colliders. C...

The triple-Pomeron coupling lies at the heart of the predictions for high energy diffractive processes. We explain why the existing determinations, which use single-particle inclusive hadronic data a+ b → a+Y , underestimate the value of the bare coupling, due to the neglect of soft rescattering which populates the rapidity gaps. We describe how data for the process γ+ p → J/ψ+Y can be used to ...