19,972 research outputs found
The maximization of Tsallis entropy with complete deformed functions and the problem of constraints
We first observe that the (co)domains of the q-deformed functions are some
subsets of the (co)domains of their ordinary counterparts, thereby deeming the
deformed functions to be incomplete. In order to obtain a complete definition
of -generalized functions, we calculate the dual mapping function, which is
found equal to the otherwise \textit{ad hoc} duality relation between the
ordinary and escort stationary distributions. Motivated by this fact, we show
that the maximization of the Tsallis entropy with the complete -logarithm
and -exponential implies the use of the ordinary probability distributions
instead of escort distributions. Moreover, we demonstrate that even the escort
stationary distributions can be obtained through the use of the ordinary
averaging procedure if the argument of the -exponential lies in (-,
0].Comment: 7 page
Rapidity Gaps from Colour String Topologies
Diffractive deep inelastic scattering at HERA and diffractive W and jet
production at the Tevatron are well described by soft colour exchange models.
Their essence is the variation of colour string-field topologies giving both
gap and no-gap events, with a smooth transition and thereby a unified
description of all final states.Comment: 3 pages, 6 eps figures, contribution to the DIS 99 workshop
proceedings, uses npb.st
The Rare Top Decays and
The large value of the top quark mass implies that the rare top decays and , and and
, are kinematically allowed decays so long as or , respectively. The partial decay widths for these decay modes
are calculated in the standard model. The partial widths depend sensitively on
the precise value of the top quark mass. The branching ratio for is as much as for , and could be
observable at LHC. The rare decay modes and are highly GIM-suppressed, and thus provide a means for testing the GIM
mechanism for three generations of quarks in the u, c, t sector.Comment: 19 pages, latex, t->bWZ corrected, previous literature on t->bWZ
cited, t->cWW unchange
Stabilities of generalized entropies
The generalized entropic measure, which is optimized by a given arbitrary
distribution under the constraints on normalization of the distribution and the
finite ordinary expectation value of a physical random quantity, is considered
and its Lesche stability property (that is different from thermodynamic
stability) is examined. A general condition, under which the generalized
entropy becomes stable, is derived. Examples known in the literature, including
the entropy for the stretched-exponential distribution, the quantum-group
entropy, and the kappa-entropy are discussed.Comment: 16 pages, no figure
Negative s and Light New Physics
Motivated by the difference between SLD's recent measurement of ALR and the
corresponding LEP results, we explore which kinds of new particles can (1)
contribute dominantly to new physics through oblique corrections, (2) produce
negative values for S and T, and (3) not be in conflict with any other
experiments, on or off the Z resonance. We are typically led to models which
involve new particles which are not much heavier than MZ/2, and so which may
also have implications for other experiments in the near future. For such light
particles, we show how the oblique-parameter analysis of purely Z-pole data
requires the interpretation of the data in terms of modified parameters, S' and
T', whose difference from S and T improves the available parameter space of the
models.Comment: plain TeX, 16 pages, 6 figures attached as a uuencoded file,
McGill-94/27, NEIP-94-00
Evaluation representations of quantum affine algebras at roots of unity
The purpose of this paper is to compute the Drinfel'd polynomials for two
types of evaluation representations of quantum affine algebras at roots of
unity and construct those representations as the submodules of evaluation
Schnizer modules. Moreover, we obtain the necessary and sufficient condition
for that the two types of evaluation representations are isomorphic to each
other
The Internal Control System of Russian Corporations
corporate form, organizational behavior, institutional complementarity, stock ownership, corporate governance, separation of ownership and management, ownership structure, corporate performance, managerial turnover, Russia
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