1,095 research outputs found
On Commutation Relations for Quons
The model of generalized quons is described in a purely algebraic way.
Commutation relations and corresponding consistency conditions for our
generalized quons system are studied in terms of quantum Weyl algebras. Fock
space representation and corresponding scalar product is also given.Comment: 17 pages in Latex, (corrected missprints in two formulas
New baryonic and mesonic observables from NA61/SHINE
One of the main objectives of the NA61/SHINE experiment at the CERN SPS is to
study properties of strongly interacting matter. This paper presents new
results on observables relevant for this part of the NA61/SHINE programme.
These include the first ever measurements of meson production in p+p
collisions at 40 and 80 GeV, and most detailed ever experimental data at 158
GeV. This contribution demonstrates the superior accuracy of the present
dataset with respect to existing measurements. The comparison of p+p to Pb+Pb
collisions shows a non-trivial system size dependence of the longitudinal
evolution of hidden strangeness production, contrasting with that of other
mesons. Furthermore, proton density fluctuations are investigated as a possible
order parameter of the second order phase transition in the neighbourhood of
the critical point (CP) of strongly interacting matter. An intermittency
analysis is performed of the proton second scaled factorial moments in
transverse momentum space. A previous analysis of this sort revealed
significant power-law fluctuations for the "Si"+Si system at 158A GeV measured
by the NA49 experiment. The fitted power-law exponent was consistent within
errors with the theoretically expected critical value, a result suggesting a
baryochemical potential in the vicinity of the CP of about 250 MeV. The
analysis will now be extended to NA61/SHINE systems of similar size, Be+Be and
Ar+Sc, at 150A GeV. Finally, spectator-induced electromagnetic (EM) effects on
charged meson production are being studied and bring information on the
space-time position of the pion formation zone, which appears to be much closer
to the spectator system for faster pions than for slower ones. On that basis,
we demonstrate that the longitudinal evolution of the system at CERN SPS
energies may be interpreted as a pure consequence of local energy-momentum
conservation
Remarks on Quantum Statistics II
Some problems related to an algebraic approach to quantum statistics are
discussed. Generalized quantum statistics is described as a result of
interactions. The Fock space representation is discussed. The problem of
existence of well--defined scalar product is considered. An example of physical
effect in system with generalized statistics is also given.Comment: 14 pages in Latex, This paper is an revisited version of the paper in
Proceedings of the Conference "Particles, Fields and Gravitation", ed. by J.
Rembielinski, World Scientific, Singapore 1998, April 15 - 19, (1998), Lodz,
Polan
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