Mass Determination Method for the Right and Left Selectron Above Production Threshold

The determination of the masses of Supersymmetric particles such as the Selectron for energies above threshold using the energy end-points method is subject to signal deconvolution difficulties and to Standard Model and Supersymmetric backgrounds. The important features of Right and Left Selectron production are used to design an experimentally robust method both for determining the Left and Right Selectron masses, the Neutralino mass and for suppresing backgrounds. The mass resolution is an order of magnitude better than in previous methods. Additional features, such as the determination of the relative leptonic branching ratios of the selectron decay are present in the method.Comment: 4 pages in RevTex (Latex) format and 4 figures in eps forma

Confronting the Minimal Supersymmetric Standard Model with the Study of Scalar Leptons at Future Linear e+e- Colliders

Sleptons can easily be found at future linear e+e- colliders if kinematically accessible. Measurements of their masses and decay distributions would then determine MSSM parameters. This paper presents a detailed MC study of the production and decay of the lighter scalar tau lepton, stau1. We found that mstau1 and the left-right mixing angle of stau would be measured within an error of a few percent. tanbeta is determinable in some region of the parameter space through simultaneous studies of stau1-and selectron-pair production: the polarization measurement of the tau leptons from stau1 decays and the M1, mchi1 determination using selectron pair production and decay. We also point out the possibility to determine bino-selectron-e coupling through the measurement of the angular distribution of the selectron-pair production. The error on the coupling is expected to be comparable to its typical SUSY radiative correction, which is proportional to log(msquark/mslepton). The radiative correction affects M1 and tanbeta determination, necessitating the full 1-loop radiative correction to the selectron production processes. The implication of these measurements of the MSSM parameters on selecting models of the origin of supersymmetry breaking is also discussed.Comment: 35 pages. REVTEX(gzip compressed and uuencoded). Figure are not included. Text and 15 Figures are available at http://jlcux1.kek.jp/subg/susy/index-e.html#librar

Application of Representational Difference Analysis to Genomic Fragments of Marek's Disease Virus

A rapid and simple method for isolation of DNA fragments of Marek's disease virus (MDV) based on representational difference analysis (RDA) was developed. Multiple viral DNA fragments, the sizes of which were restricted to 0.3 to 3.5 kbp, were simultaneously amplified after subtraction of chicken DNA from BamHI-, BglII-, EcoRI-, HindIII-, or XhoI-digested DNA fragments of MDV-infected cells. Nucleotide sequence of two RDA-derived fragments coincided with the sequence determined from direct sequencing of the MDV genome. We detected an interstrain difference in the size of restriction enzyme-digested fragments on agarose gel. This method was used on a single feather pulp to generate sufficient MDV DNA for cloning

Arteperoxides A-C, tris-normonoterpene-sesquiterpene conjugates with peroxide-bridges from Artemisia judaica exhibiting antiosteoclastogenic activity

Antiosteoclastogenic-guided screening was conducted with 120 extracts of the medicinal plants collected in Egypt that led to the selection of Artemisia judaica L. (Asteraceae). Three undescribed davanone-related terpenoids, arteperoxides A–C, were isolated from the extract with two known derivatives, hydroxydavanone and davana acid. Structural analysis revealed that arteperoxides A–C were tris-normonoterpene–sesquiterpene conjugates with peroxide bridges. Although davanone derivatives with peroxides, such as a hydroperoxyl and peroxyhemiketal groups, have been isolated from Artemisia species, arteperoxides A–C are the first variations observed to contain peroxide bridges between two terpene-derived units. The absolute configurations of arteperoxides A and B were studied based on their spectroscopic data compared with those of the semisynthetic analogs that have ether linkages. The natural and synthetic compounds were tested for the antiosteoclastogenic activity, and arteperoxide C and hydroxydavanone were more potent than other compounds at 20 μM