Erscheinungsdatum: 07/2009, Medium: Taschenbuch, Einband: Kartoniert / Broschiert, Titel: Interference Phenomena in Electron Positron Annihilation, Titelzusatz: Future Electron Positron Collider Predictions, Autor: Raina, Sanjay, Verlag: VDM Verlag, Sprache: Englisch, Rubrik: Atomphysik // Kernphysik, Seiten: 132, Informationen: Paperback, Gewicht: 212 gr, Verkäufer: averdo
Theory of Jets in Electron-Positron Annihilation ab 92.99 € als Taschenbuch: Softcover reprint of the original 1st ed. 1984. Aus dem Bereich: Bücher, Wissenschaft, Physik,
This book presents the original papers of the authors, published in different cotton related journals during 2000-2007. In this book authors used inverted light microscopy, electron microscopy, electron-positron annihilation spectroscopy and special preparation techniques to see in-vivo microstructure of alive cotton fiber and cotton seed inner structure without damaging. Authors have generated valuable data on the microstructure of cotton fiber at various stages of development by measuring the spectra of positron lifetime and the angular correlation of annihilation radiation. Original funding of authors is discovery luminescence phenomena of young alive cotton hair age 5-10 days after anthesis. The authors have described a non-muscular mobility of cotton fibers developing in vivo for four different cotton varieties. Fiber exhibits a collective pulsing and lengthening that is coordinated with non-muscular movement. The mechanisms of the living hair growlh of cotton cultivars at early stages of their development have been studied. It has been found that a plasmalemma of cells-hairs makes spiral movement during their lengthening.
In this monograph predictions for parity violating symmetries have been presented that arise from the interference beween strong and electroweak sectors of the standard model.The peculiar correlation between the final states arrsing due to the constraint of having the same quantum numbers for the final states involving weak bosons and in which the weak boson is replaced by a gluon, results in parity violating behavior which might be observable in future electron positron colliders operating at energies well above the threshould of producing a pair of massive vector bosons.The observations of these assymetries should be possible at future electron positron colliders. The results presented are intriguing examples of interplay between different sectors of the standard model and could be a prelude to the processes in models involving extended symmetries, like Supersymmetry, where the effects could be more pronounced.
The effective field theory vNRQCD allows to describe among others the production of top-antitop pairs in electron-positron collisions at threshold, i.e. with very small relative velocity of the quarks. Potentially large logarithms of the velocity are systematically summed up and lead to a scale dependence of the Wilson coefficients of the theory. The missing contributions to the cross section for top-antitop production in the resonance region at next-to-next-to-leading logarithmic (NNLL) level are the so-called mixing contributions to the NNLL anomalous dimension of the S-wave production/annihilation current of the top quark pair. To calculate these one has to know the next-to-leading logarithmic (NLL) renormalization group running of so-called potentials (four-quark operators). The dominant contributions to the anomalous dimension of these potentials come from vNRQCD diagrams with ultrasoft gluon loops. The aim of this thesis is to derive the complete ultrasoft NLL running of the relevant potentials. Technical and conceptional issues are discussed and preliminary results are analyzed with regard to the consequences for the mentioned cross section and its theoretical uncertainty.
Electron positron annihilation occurs when an electron and a positron collide. The result of the collision is the conversion of the electron and positron and the creation of gamma ray photons or, less often, other particles. The process must satisfy a number of conservation laws, including: Conservation of charge. The net charge before and after is zero.
In particle physics, antimatter is the extension of the concept of the antiparticle to matter, where antimatter is composed of antiparticles in the same way that normal matter is composed of particles. For example, an antielectron a positron, an electron with a positive charge and an antiproton a proton with a negative charge could form an antihydrogen atom in the same way that an electron and a proton form a normal matter hydrogen atom. Furthermore, mixing matter and antimatter would lead to the annihilation of both in the same way that mixing antiparticles and particles does, thus giving rise to high-energy photons gamma rays or other particle antiparticle pairs. There is considerable speculation as to why the observable universe is apparently almost entirely matter, whether there exist other places that are almost entirely antimatter instead, and what might be possible if antimatter could be harnessed, but at this time the apparent asymmetry of matter and antimatter in the visible universe is one of the greatest unsolved problems in physics. The process by which this asymmetry between particles and antiparticles developed is called baryogenesis
High Quality Content by WIKIPEDIA articles! The positron or antielectron is the antiparticle or the antimatter counterpart of the electron. The positron has an electric charge of +1, a spin of 1?2, and the same mass as an electron. When a low-energy positron collides with a low-energy electron, annihilation occurs, resulting in the production of two or more gamma ray photons. Positrons may be generated by positron emission radioactive decay (through weak interactions), or by pair production from a sufficiently energetic photon.