239 research outputs found
Probing a Nucleon Spin Structure at TESLA by the Real Polarized Gamma Beam
The recent proposals concerning the usage of the real polarized gamma beam,
obtained by the Compton backscattering of the laser photons off the electron
beams from either the linear or circular accelerators were considered. The
heavy quark photoproduction process giving a unique opportunity to measure
polarized gluon distribution was investigated.Comment: 16 pages, LATEX, 6 figures (EPS
Weakly J-ideals of Commutative Rings
Let be a commutative ring with non-zero identity. In this paper, we
introduce the concept of weakly -ideals as a new generalization of
-ideals. We call a proper ideal of a ring a weakly -ideal if
whenever with and , then .
Many of the basic properties and characterizations of this concept are studied.
We investigate weakly -ideals under various contexts of constructions such
as direct products, localizations, homomorphic images. Moreover, a number of
examples and results on weakly -ideals are discussed. Finally, the third
section is devoted to the characterizations of these constructions in an
amagamated ring along an ideal
Quasi J-ideals of Commutative Rings
Let be a commutative ring with identity. In this paper, we introduce the
concept of quasi -ideal which is a generalization of -ideal. A proper
ideal of is called a quasi -ideal if its radical is a -ideal. Many
characterizations of quasi -ideals in some special rings are obtained. We
characterize rings in which every proper ideal is quasi -ideal. Further, as
a generalization of presimplifiable rings, we define the notion of quasi
presimplifiable rings. We call a ring a quasi presimplifiable ring if
whenever and , then either is a nilpotent or is a
unit. It is shown that a proper ideal that is contained in the Jacobson
radical is a quasi -ideal (resp. -ideal) if and only if is a quasi
presimplifiable (resp. presimplifiable) ring
Semi r-ideals of commutative rings
For commutative rings with identity, we introduce and study the concept of semi r-ideals which is a kind of generalization of both r-ideals and semiprime ideals. A proper ideal I of a commutative ring R is called semi r-ideal if whenever a (2)?I and Ann (R)(a) = 0, then a ? I. Several properties and characterizations of this class of ideals are determined. In particular, we investigate semi r-ideal under various contexts of constructions such as direct products, localizations, homomorphic images, idealizations and amalagamations rings. We extend semi r-ideals of rings to semi r-submodules of modules and clarify some of their properties. Moreover, we define submodules satisfying the D-annihilator condition and justify when they are semi r-submodules
Anomalous single production of the fourth SM family quarks at Tevatron
Possible single productions of fourth family u_{4} and d_{4} quarks via
anomalous q_{4}qV interactions at Tevatron are studied. Signature of such
processes are discussed and compared with the recent results from Tevatron.Comment: 6 pages, 1 figure, 4 table
Fourth Generation Pseudoscalar Quarkonium Production and Observability at Hadron Colliders
The pseudoscalar quarkonium state, eta_4 1^S_0, formed by the Standard Model
(SM) fourth generation quarks, is the best candidate among the fourth
generation quarkonia to be produced at the LHC and VLHC. The production of this
J^{PC} = 0^{-+} resonance is discussed and the background processes are studied
to obtain the integrated luminosity limits for the discovery, depending on its
mass.Comment: 13 pages, 4 figures, 5 table
The Fourth Standard Model Family and the Competition in Standart Model Higgs Boson Search at Tevatron and LHC
The impact of the fourth Standard Model family on Higgs boson search at
Tevatron and LHC is reviewed.Comment: 7 pages, 13 figure
Colored Resonant Signals at the LHC: Largest Rate and Simplest Topology
We study the colored resonance production at the LHC in a most general
approach. We classify the possible colored resonances based on group theory
decomposition, and construct their effective interactions with light partons.
The production cross section from annihilation of valence quarks or gluons may
be on the order of 400 - 1000 pb at LHC energies for a mass of 1 TeV with
nominal couplings, leading to the largest production rates for new physics at
the TeV scale, and simplest event topology with dijet final states. We apply
the new dijet data from the LHC experiments to put bounds on various possible
colored resonant states. The current bounds range from 0.9 to 2.7 TeV. The
formulation is readily applicable for future searches including other decay
modes.Comment: 29 pages, 9 figures. References updated and additional K-factors
include
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