149 research outputs found
A RECONCEPTUALIZATION OF SOCIAL STRUCTURE OF ACCUMULATION THEORY
This article puts forward a reconceptualization of the theory of a social structure
of accumulation (SSA). The thirty years of neoliberalism presenta problem for SSA
theory. According to current SSA theory, an SSA is an institutional configuration
that for a long period of time promotes rapid capital accumulation and economic growth.
Although neoliberalism is clearly a new and long-lasting institutional structure that
replaced the postwar SSA, growth in the neoliberal economy has been relatively sluggish.
This article offers a revised concept of an SSA, which makes it possible to explain
neoliberalism as an SSA. It argues that every SSA promotes profit-making but does
not necessarily bring accumulation that is rapid by some historical standard. It introduces
the concept of liberal and regulated SSAs and examines the features of both types
of SSA. It considers the implications of this revised SSA theory for understanding
the current capitalist economic crisis.
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Measurement of inclusive D*+- and associated dijet cross sections in photoproduction at HERA
Inclusive photoproduction of D*+- mesons has been measured for photon-proton
centre-of-mass energies in the range 130 < W < 280 GeV and a photon virtuality
Q^2 < 1 GeV^2. The data sample used corresponds to an integrated luminosity of
37 pb^-1. Total and differential cross sections as functions of the D*
transverse momentum and pseudorapidity are presented in restricted kinematical
regions and the data are compared with next-to-leading order (NLO) perturbative
QCD calculations using the "massive charm" and "massless charm" schemes. The
measured cross sections are generally above the NLO calculations, in particular
in the forward (proton) direction. The large data sample also allows the study
of dijet production associated with charm. A significant resolved as well as a
direct photon component contribute to the cross section. Leading order QCD
Monte Carlo calculations indicate that the resolved contribution arises from a
significant charm component in the photon. A massive charm NLO parton level
calculation yields lower cross sections compared to the measured results in a
kinematic region where the resolved photon contribution is significant.Comment: 32 pages including 6 figure
Measurement of Jet Shapes in Photoproduction at HERA
The shape of jets produced in quasi-real photon-proton collisions at
centre-of-mass energies in the range GeV has been measured using the
hadronic energy flow. The measurement was done with the ZEUS detector at HERA.
Jets are identified using a cone algorithm in the plane with a
cone radius of one unit. Measured jet shapes both in inclusive jet and dijet
production with transverse energies GeV are presented. The jet
shape broadens as the jet pseudorapidity () increases and narrows
as increases. In dijet photoproduction, the jet shapes have been
measured separately for samples dominated by resolved and by direct processes.
Leading-logarithm parton-shower Monte Carlo calculations of resolved and direct
processes describe well the measured jet shapes except for the inclusive
production of jets with high and low . The observed
broadening of the jet shape as increases is consistent with the
predicted increase in the fraction of final state gluon jets.Comment: 29 pages including 9 figure
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