884 research outputs found
From the exclusive photoproduction of heavy quarkonia at HERA to the EDDE at TeVatron and LHC
Exclusive photoproduction of heavy quarkonia at HERA is analyzed in the
framework of the Regge-eikonal approach together with the nonrelativistic bound
state formalism. Total and differential cross-sections for the process
are calculated. The model predicts
cross-sections of Exclusive Double Diffractive Events (EDDE) at TeVatron and
LHC.Comment: 14 pages, 6 figures, reference is adde
Exclusive Double Diffractive Events: Menu for LHC
Exclusive double diffractive events (EDDE) are considered in the framework of
the Regge-eikonal approach and perturbative calculations for "hard"
subprocesses. Total and differential cross-sections for processes are calculated.Comment: 18 pages, Latex 2.09, 6 postscript figures, references are adde
Hard Diffraction and Unitarity
A short survey of the role of unitarity for hard diffractive cross-sections
is givenComment: 4 pages, LaTeX, no figures, Talk at the International Workshop "
Diffraction 2000" (Cetraro, Italy, 2-7 September 2000
Hadron multiplicities in e+e- annihilation with heavy primary quarks
The multiple hadron production in the events induced by the heavy primary
quarks in annihilation is reconsidered with account of corrected
experimental data. New value for the multiplicity in events is
presented on the basis of pQCD estimates.Comment: 16 pages, 6 figures. Version accepted for publication in EPJ
5-dimensional Quantum Gravity Effects in Exclusive Double Diffractive Events
The experimentally measurable effects related to extra dimensional gravity in
a RS-type brane world are estimated. Two options of the RS framework (namely,
with small and large curvature) are considered. It is shown that both can be
detected by the joint experiment of the CMS and TOTEM Collaborations at the
LHC.Comment: 11 pages, 6 figures, 4 tables, acknowledgments are adde
Electric dipole moments of Hg, Xe, Rn, Ra, Pu, and TlF induced by the nuclear Schiff moment and limits on time-reversal violating interactions
We have calculated the atomic electric dipole moments (EDMs) induced in
^{199}Hg, ^{129}Xe, ^{223}Rn, ^{225}Ra, and ^{239}Pu by their respective
nuclear Schiff moments S. The results are (in units 10^{-17}S(e {fm}^{3})^{-1}e
cm): d(^{199}Hg)=-2.8, d(^{129}Xe)=0.38, d(^{223}Rn)=3.3, d(^{225}Ra)=-8.5,
d(^{239}Pu)=-11. We have also calculated corrections to the parity- and
time-invariance-violating (P,T-odd) spin-axis interaction constant in TlF.
These results are important for the interpretation of atomic and molecular
experiments on EDMs in terms of fundamental P,T-odd parameters.Comment: 16 page
Nucleotide sequence of the Galleria mellonella nuclear polyhedrosis virus origin of DNA replication
AbstractThe initiation sites of the Galleria mellonella L. nuclear polyhedrosis virus (G.m. NPV) DNA replication were revealed. For this purpose SCLd 135 cells permitting the G.m. NPV productive reproduction were transformed by the recombinant plasmids containing the viral genome individual fragments in pRSF 2124 and pBR 322 vectors. It was revealed that 2 of the 32 recombinant plasmids can autonomously replicate in the eucaryotic cells. According to the Maxam-Gilbert method the DNA G.m. NPV fragment (1300 bp) primary structure of pHBR plasmid was determined. The structure analysis revealed the typical regulator signals as in the replicons. The possible regulation mechanisms of the DNA G.m. NPV synthesis initiation was supposed
Механизм управления доступом к данным в условиях виртуальной внешней модели
The article discusses the problem of organizing different levels of access to data within information systems. These are based on a relational database designed to automate the management of the enterprise. Here we introduce the necessary definitions and concepts to build a model that allows us to make the mechanism of restricting access to data at the level of the relational model.В статье рассматривается проблема организации разграничения доступа к данным в информационных системах, построенных на основе реляционных баз данных, предназначенных для автоматизации управления предприятием. В данной статье вводятся необходимые определения и понятия для построения модели разграничения доступа к данным на уровне реляционной модели через формирование виртуальных внешних моделей базы данных
Towards Extraction of and cross-sections from Charge Exchange Processes at the LHC
We study the possibilities to analyse the data on leading neutrons production
at first LHC runs. These data could be used to extract from it and
cross-sections. In this note we estimate relative contributions of
, and reggeons to charge exchanges and discuss related
problems of measurements.Comment: 8 pages, 9 figures, to be publishe
Choice of parameters for Tesla transformer of pulsed power beam generator type
The accelerating voltage pulse generators of relativistic electron beams and high-power ion beam accelerators are subdivided into two main types: Marx generators and Tesla transformer type generators. In presented paper the attempt to create the methodology of the engineering substantiation of parameters and designing the Tesla transformer type generator for pulsed power accelerators is undertaken
- …