MODIFIED PERTURBATION THEORY FOR ANGULAR DISTRIBUTION IN W-PAIR PRODUCTION

We examine the capabilities of the modified perturbation theory (MPT) for description of W-pair production and decay in e+ e- annihilation. In a model with Dyson-resummed propagators of unstable particles, we calculate even and odd contributions to the distribution in the cosine of the W- production angle relative to the e- beam. On comparing the results of calculations in the NNLO approximation of MPT with the exact results in the model, a coincidence of outcomes at the ILC energies is detected at the per-mille level.

TWO PHOTON PHYSICS AT BELLE

Results of high statistic two-photon collisions at Belle are presented. Only [Formula: see text] process is included in this report, here [Formula: see text] could be π+π-, K+K-, [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text] or [Formula: see text]. Measurements of [Formula: see text] for charmonia resonance states are listed. A new χ′c2 candidate in [Formula: see text] has been identified as a spin-2 (helicity-2) object. Cross section and production angle distributions are measured and compared with various QCD calculations.

Testing Nucleon Strangeness in Polarization Effects for n+p→d+η

Charge symmetry of strong interaction results in a simplified spin structure of amplitude for n+p→d+η in "orthogonal" kinematics, where the η-production angle is equal to 90° in CMS. The presence of singlet and triplet amplitudes in such kinematics induces a rich set of different polarization observables, sensitive to the relative value of these amplitudes. This can be used to test a hypothesis of singlet enhancement of η-production in NN- and [Formula: see text]-collisions, due to a nonperturbative [Formula: see text]-component of the nucleon with special polarization properties.

Design for Production

The title of the paper infers that, in general, aircraft design is not fundamentally suitable for production and, for various reasons, design for quick and easy production must be the result of compromise. In practice optimum design and easy production never seem to coincide exactly. Refinement of design for production covers many broad conceptions.In its broadest sense it should be the uppermost consideration from the very beginning of the design of the prototypes. The primary object of designing any new aircraft, civil or military, is to be able to produce a series of the most efficient fully approved and tested production aircraft at the highest possible rate in the shortest possible time. The first part of the paper, therefore, deals with the design and production planning phases of a new aircraft when, by joint consultation with the production departments, the design is viewed from the production angle from the outset.