8,246 research outputs found
Next-to-Leading Photonic Corrections to Small-Angle Bhabha Scattering in the Structure Function Formalism
A general method for computing and higher-order
next-to-leading photonic corrections is presented and applied to the precision
calculation of the small-angle Bhabha scattering cross section in the
phase-space region of interest for the luminosity measurement at LEP. The
formulation is based on a proper matching of exact results
with higher-order corrections in the Structure Function formalism. The results
of the approach are analytically compared with theoretical calculations, both
for - and -channel processes, available for simple Event Selections.
Numerical predictions for realistic Event Selections are also provided and
critically compared with the ones existing in the literature.Comment: 16 pages, gzip'ed uuencoded tar fil
State morphism MV-algebras
We present a complete characterization of subdirectly irreducible MV-algebras
with internal states (SMV-algebras). This allows us to classify subdirectly
irreducible state morphism MV-algebras (SMMV-algebras) and describe single
generators of the variety of SMMV-algebras, and show that we have a continuum
of varieties of SMMV-algebras
A note on drastic product logic
The drastic product is known to be the smallest -norm, since whenever . This -norm is not left-continuous, and hence it
does not admit a residuum. So, there are no drastic product -norm based
many-valued logics, in the sense of [EG01]. However, if we renounce standard
completeness, we can study the logic whose semantics is provided by those MTL
chains whose monoidal operation is the drastic product. This logic is called
in [NOG06]. In this note we justify the study of this
logic, which we rechristen DP (for drastic product), by means of some
interesting properties relating DP and its algebraic semantics to a weakened
law of excluded middle, to the projection operator and to
discriminator varieties. We shall show that the category of finite DP-algebras
is dually equivalent to a category whose objects are multisets of finite
chains. This duality allows us to classify all axiomatic extensions of DP, and
to compute the free finitely generated DP-algebras.Comment: 11 pages, 3 figure
Six-Fermion Calculation of Intermediate-mass Higgs Boson Production at Future Colliders
The production of an intermediate-mass Higgs boson in processes of the kind
fermions at the energies of future linear colliders is studied.
The recently developed and fully automatic algorithm/code ALPHA is used to
compute the tree-level scattering amplitudes for the reactions . The code has been interfaced with the Monte Carlo program HIGGSPV/WWGENPV,
properly adapted to 6-fermion production, in order to provide realistic
results, both in the form of cross sections and event samples at the partonic
level. Phenomenological results, that incorporate the effects of initial-state
radiation and beamstrahlung, are shown and commented, emphasizing the
potentials of full six-fermion calculations for precise background evaluation
as well as for detailed studies of the fundamental properties of the Higgs
particle.Comment: 31 pages, LaTeX, 15 eps low-resolution figures include
Six-fermion production and Higgs boson physics at future colliders
The six-fermion production processes ,
with all the lepton flavours and , relevant to the study of the
intermediate-mass Higgs boson at future linear colliders, are
analysed. A Monte Carlo program, taking into account the whole set of
tree-level scattering amplitudes and the relevant radiative effects, is
developed to provide integrated cross sections and generation of unweighted
events. The complete calculation is compared with the available results of real
Higgs production, and the opportunities of precision studies with event
generation are discussed, demonstrating the relevance of a full six-fermion
calculation. Numerical results for integrated cross sections with various
kinematical cuts and including radiative effects are given and commented. In
the analysis of event samples, several distributions are studied and found to
be sensitive to the presence and to the properties of the Higgs boson.Comment: LaTeX, 27 pages, 13 figures included. Minor changes, final version to
appear in Eur. Phys. J.
How should requirements be defined to have real innovation?
People are generally influenced in their purchasing choices by diverse stakeholders and these influences are often not related only to âuse situationsâ. Learning processes, product diffusion dynamics and externalities in fact frequently complicate innovation processes. âDesign for Innovationâ means considering that design cannot focus only on buyer's preferences and on âproduct useâ because this could limit diffusion of products, besides bounding in general innovation opportunities. The âDesign for Innovationâ approach drives to study âbeyond use situationsâ and the influences among the actors involved in the innovation processes. This paper describes through two different case studies how a more original list of needs that would have not emerged with more traditional approaches for the requirement management, can be generated with this approach
Electroweak Physics in Six-Fermion Processes at Future Colliders
Recent developments in the field of complete electroweak tree-level
calculations for six-fermion final states in e+ e- collisions are briefly
reviewed. Particular attention is given to top-quark and Higgs boson physics,
which are items of primary importance at the Next Linear Collider. The
relevance of electroweak backgrounds and finite-width effects is discussed,
showing the importance of complete calculations for precision studies at the
colliders operating in the TeV energy range.Comment: LaTeX (using npb style), 6 pages, 5 .eps figure
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