In this talk we review the models describing the hard diffractive production of jets or more generally high-mass states in presence of rapidity gaps in hadron-hadron and lepton-hadron collisions. By rapidity gaps we mean regions on the lego plot in (pseudo)-rapidity and azimuthal angle where no hadrons are produced, between the jet(s) and an elastically scattered hadron (single hard diffraction...

A text-book on this subject has been long overdue and the authors are to be congratulated on the production of such an interesting and readable volume which contains much important work hitherto accessible to the student only in scattered writings. The book includes admirable descriptions of modern industrial processes, viz., mining, iron and steel working, textile industries, potteries and gla...

According to QED in the hard charged longitudinally polarized lepton–unpolarized quark scattering l + q → l + q lepton transfers its polarization to final quark. Within the simple parton model description of SIDIS the hadron production in the current fragmentation region is described by independent fragmentation of scattered quark. Then the (anti)quark polarization can be transferred to produce...

In a second best environment, the optimal policy choice sometimes follows first best rules, as described in a number of scattered works. This paper presents a formal general argument which allows to unify much of the literature. It lays down the information structure and separability assumptions under which the results hold in a variety of setups, with extensions to preference heterogeneity and...

EDEMA of the heart muscle appears to be a nonspecific response to various types of cardiac injury, as pointed out in several publications recently reviewed. *• The evolution of myocardial edema has not been studied in controlled experiments, although the increased water content or the edematous appearance of certain postmortem heart-muscle specimens has elicited comment and speculation, widely ...

Vector meson (VM) production at HERA is illustrated in Fig. 1(left): the intermediate photon converts into a diffractively scattered qq̄ pair forming a VM, while the proton remains intact or is diffractively excited into the system Y . Here Q is the negative square of the photon four-momentum, W the photonproton center of mass energy (W ≃ Q/x, x being the Bjorken scaling variable) and t the squa...

We show that it is relatively consistent with ZFC that 2ω is arbitrarily large and every sequence s = 〈sα : α < ω2〉 of infinite cardinals with sα ≤ 2ω is the cardinal sequence of some locally compact scattered space.