44,103 research outputs found
Building blocks of amplified endomorphisms of normal projective varieties
Let be a normal projective variety. A surjective endomorphism is int-amplified if for some ample Cartier divisors and . This is a generalization of the so-called polarized endomorphism which requires that for some ample Cartier divisor and . We show that this generalization keeps all nice properties of the polarized case in terms of the singularity, canonical divisor, and equivariant minimal model program
B-Quark Production at Hadron Colliders
Results for b-quark production at hadron colliders, both current and
proposed, are presented. Distributions in are presented for the TeVatron
and SSC. Confirmation of agreement between the
calculations and UA1 data is presented, and the discrepancy between the calculations and the CDF results is updated with the most
recent data.Comment: LaTeX 9 pages with 6 uuencoded figures at the end, SMU HEP 93-08,
AL-HEP-CP-93-6
Measurement and Calibration of A High-Sensitivity Microwave Power Sensor with An Attenuator
In this paper, measurement and calibration of a high-sensitivity microwave power sensor through an attenuator is performed using direct comparison transfer technique. To provide reliable results, a mathematical model previously derived using signal flow graphs together with non-touching loop rule analysis for the measurement estimate (i.e. calibration factor) and its uncertainty evaluation is comparatively investigated. The investigation is carried out through the analysis of physical measurement processes, and consistent mathematical model is observed. Later, an example of Type-N (up to 18 GHz) application is used to demonstrate its calibration and measurement capability
Relativistic mean field theory for deformed nuclei with pairing correlations
We develop a relativistic mean field (RMF) description of deformed nuclei
with the pairing correlations in the BCS approximation. The treatment of the
pairing correlations for nuclei with the Fermi surface being close to the
threshold of unbound states needs a special attention. To this end, we take the
delta function interaction for the pairing interaction with the hope to pick up
those states with the wave function being concentrated in the nuclear region
and perform the standard BCS approximation for the single particle states
generated by the RMF theory with deformation. We apply the RMF + BCS method to
the Zr isotopes and obtain a good description of the binding energies and the
nuclear radii of nuclei from the proton drip line to the neutron drip line.Comment: the version to be published in Progress of Theoretical Physic
Volume Dependence of Spectral Weights for Unstable Particles in a Solvable Model
Volume dependence of the spectral weight is usually used as a simple criteria
to distinguish single-particle states from multi-particle states in lattice QCD
calculations. Within a solvable model, the Lee model, we show that this
criteria is in principle only valid for a stable particle or a narrow
resonance. If the resonance being studied is broad, then the volume dependence
of the corresponding spectral weight resembles that of a multi-particle state
instead of a single-particle one. For an unstable -particle in the Lee
model, the transition from single-particle to multi-particle volume dependence
is governed by the ratio of its physical width to the typical level spacing in
the finite volume. We estimate this ratio for practical lattice QCD simulations
and find that, for most cases, the resonance studied in lattice QCD simulations
still resembles the single particle behavior.Comment: 15 pages, no figures. Title modified. Version to appear on Phys. Rev.
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