14 research outputs found
The exploitation of assembly language instructions in biological text manipulation: II. Amino acid sequences
AbstractAmino acid residues may be divided into groups according to similarity of function, or evolutionary history, or other useful criteria. A grouping of amino acids into the eight sets based upon functionality allows a representation involving a three-bit code that can be of value in string matching searches. An amino acid residue may be identified uniquely by employing a further two bits. We propose that amino acid sequence data and search strings be preprocessed to form strings of highest bits, strings of the next highest bits, and so on. Machine assembly language instructions on the separate bit-strings provide a hierarchical measure of homology. We study a number of preprocessing strategies arranged to accord with the kind of search contemplated
An absolute polarimeter for high energy protons
A study of the spin asymmetries for polarized elastic proton proton
collisions in the electromagnetic hadronic interference (CNI) region of
momentum transfer provides a method of self calibration of proton polarization.
The method can be extended to non-identical spin half scattering so that, in
principle, the polarization of a proton may be obtained through an analysis of
its elastic collision with a different polarized particle, helium 3 for
instance. Sufficiently large CNI spin asymmetries provide enough information to
facilitate the evaluation of nearly all the helicity amplitudes at small t as
well as the polarization of both initial spin half fermions. Thus it can serve
equally well as a polarimeter for helium 3
Form of analyzing power and the determination of the basic parameters of hadron scattering amplitude
The determination of magnitudes of basic parameters of the high energy
elastic scattering amplitude are examined at small momentum transfers with
taking account of the Coulomb-hadron interference effects.Comment: 6 pages, LaTeX, 4 figures (files.ps), Talk at the International
Workshop "Spin and Symmetry" (Prague, Chech., 13-19 July 2000
Diffractive effects in spin-flip pp amplitudes and predictions for relativistic energies
We analyze the diffractive (Pomeron) contribution to pp spin-flip amplitude
and discuss the possible scenarios for energies available at the Relativistic
Heavy-Ion Collider (RHIC). In particular, we show that RHIC data will be
instrumental in assessing the real contribution of diffraction to spin
amplitudes.Comment: 11 pages, 12 Encapsulated PostScript files, LaTeX2e use
Spin effects in diffractive production at BNL eRHIC
We discuss quark-antiquark leptoproduction within a QCD two-gluon exchange
model at small . The double spin asymmetries for longitudinally polarized
leptons and transversely polarized protons in diffractive production
are analysed at eRHIC energies. The predicted asymmetry is large and
can be used to obtain information on the polarized generalized gluon
distributions in the proton.Comment: Some modifications of the text and graphs were done. Title is
modified slightly. To be published in Phys. Rev.
GPDs of the nucleons and elastic scattering at high energies
Taking into account the electromagnetic and gravitational form factors,
calculated from a new set of -dependent GPDs, a new model is built. The
real part of the hadronic amplitude is determined only through complex . In
the framework of this model the quantitative description of all existing
experimental data at GeV, including the
Coulomb range and large momentum transfers ($0.0008 \leq |t| \leq 9.75 \
^237$ TeV is made.Comment: 14 pages, 21 figures, minor corrections (slightly brush English and
removed two misprint in numbering
Proton-proton scattering above 3 GeV/c
A large set of data on proton-proton differential cross sections, analyzing
powers and the double polarization parameter A_NN is analyzed employing the
Regge formalism. We find that the data available at proton beam momenta from 3
GeV/c to 50 GeV/c exhibit features that are very well in line with the general
characteristics of Regge phenomenology and can be described with a model that
includes the rho, omega, f_2, and a_2 trajectories and single Pomeron exchange.
Additional data, specifically for spin-dependent observables at forward angles,
would be very helpful for testing and refining our Regge model.Comment: 16 pages, 19 figures; revised version accepted for publication in
EPJ